NOAA Teacher at Sea Blog

July 9, 2026July 9, 2026

Amelia Black: First Day of School…at Sea July 6, 2026

NOAA Teacher at Sea

Amelia Black

Aboard NOAA Ship Oregon II

July 6-17, 2026

Mission: SEAMAP Summer Groundfish Survey

Geographic Area of Cruise: Gulf of America/Gulf of Mexico

Date: July 6, 2026

Weather Data from the Bridge:

Latitude: 28.40N
Longitude: -91.40W
Sea wave height: 1 ft
Wind Speed: 8 kt
Wind Direction: 330
Visibility: 10 miles
Sea Temperature: 88℉
Air Temperature: 82℉
Barometric Pressure: 30.03 inHg
Humidity: 67.4
Sky: Overcast

Science and Technology Log

SEAMAP Summer Groundfish Survey
SEAMAP (Southeast Area Monitoring and Assessment Program) started in 1982. According to NOAA Fisheries’ Summer and Fall Groundfish Surveys in the Gulf of America, these surveys provide long-term data that help monitor the health of the ecosystem in the Gulf in order to support sustainable fisheries management. SEAMAP surveying is done in the summer and in the fall and consists of over 300 stations (stops) throughout the Gulf, spanning from Texas to Florida.

Map of the Northern Gulf of America (formerly Gulf of Mexico). The land is depicted all beige, with only the state borders visible. The water shows some bathymetric relief. An area along the coast, stretching from Texas to the tip of Florida and shaded in flat orange, depicts the survey area. — *The Summer and Fall Groundfish Survey combined collects data for over 80 days in the Northern Gulf of America per year, which is critical for fisheries managers. Credit: NOAA Fisheries*

This leg (Leg 3) of the survey will consist of survey points from Louisiana (Atchafalaya River) to northern Florida (north of Tampa Bay).

The scientists deploy a trawl net that sweeps near or on the ocean floor to collect the groundfish. This sampling shows a point in time of the Groundfish population throughout the northern area of the Gulf of America/Mexico.

crewmembers in hard hats, life vests, and gloves stand around a large net suspended from above the photo frame. they each reach toward the net; some are steadying it while others work to untie the bottom. five large plastic baskets are placed underneath the net, ready to receive the catch. it is nighttime. — NOAA Scientist Adam Pollack and NOAA Senior Survey Technician Stephanie Stabile pulling in the trawl net for sample collection.

Our first haul of this Leg took place at 2100 hours (9pm). We ended up with a collection weight of 24.179kg (53 pounds). Shrimp made up the predominant groundfish caught; total shrimp collection tipping the scales at 35 pounds!

There were four different species of shrimp collected within this sample; brown, pink, white, and mantis. The majority of the shrimp were brown shrimp (Farfantepenaeus aztecus) weighing in at 32 lbs. Next was 2.8 lbs of pink shrimp (Farfantepenaeus duorarum). We collected a small sampling of white and mantis shrimp.

We sorted the shrimp into different taxa (types). The most telling difference between the brown and the pink shrimp is that the pink shrimp has a pink dot on its side.

a comparison of three shrimp species. title: Native Shrimp in the Gulf of Mexico. each species is accompanied by an illustration against a white background, and a list of identifying features. Brown shrimp: brown body, grooved on the back of the shell, tails usually have a purple or reddish purple band and green or red pigmentation. pink shrimp: pink body, dark colored spot on each side of the body, tail usually has a dark blue band rather than the purple band found on brown shrimp, grooved shell. white shrimp: light gray body with green coloration on the tail and a yellow band on the abdomen, no grooved shell, longer antennae than other shrimp (usually 2.5-3x longer than their body) — Native shrimp found in Alabama (Photo credit: National Oceanic and Atmospheric Administration, taken from Alabama Cooperative Extension System website)

The white shrimp (Litopenaeus setiferus) is similar to the brown shrimp but has an iridescent tail. The mantis shrimp (Squilla empusa) has a sharp looking tail and is known as a ‘thumb splitter’. This made me quite leary of the shrimp at first, needless to say I was hesitant to handle the mantis shrimp (even though the ones we caught weren’t big enough to cause serious damage.)

After sorting the catch we measured and weighed the groundfish based on SEAMAP set parameters needed for data analysis. Criteria might include sending groundfish in for further testing and processing, while others groundfish populations might only require a certain number of the catch to be measured and weighed. For instance, of the shrimp caught 50 of each type were split between male and female then measured and weighed.

a brown shrimped, tail stretched out behind it, placed on a white fish measuring board. we can see the measuring board's name: Ichthystick. the shrimp stretched from about 40 to 60 cm. — Measuring the brown shrimp (*Farfantepenaeus aztecus)*.
Can you estimate her length?

Personal Log

Amelia, wearing a yellow hard hat and orange life vest, takes a selfie at the railing of NOAA Ship Oregon II. it is sunset, and the water is calm with small ripples. — First Day of School… at Sea!

Monday at 0900 hours, I boarded the ship and started my journey with NOAA’s Teacher at Sea Program. I imagine that I felt pretty similar to how my students feel on the very first day of school: a mix of intense excitement and a little bit of nervousness!

The day started with a brief tour of the ship, where I met the Field Party Chief (FPC), Faith. Then, I attended an orientation led by the officers about the ship’s rules and expectations. Just like how teachers go over classroom rules and expectations on day one.

A lot of new terms, vocabulary, and acronyms were thrown our way. Luckily, I had done a little bit of preparation and learned some of the maritime language beforehand, even though I still have a lot to learn! Here are a few quick translations:

Berth=Bed/room
Head= Bathroom
Stern=Back of Ship
Bow=Front of Ship
Muster= Meeting area for roll call

Next, we participated in two of the three required safety drills. The first was a fire drill. Instead of evacuating the vessel (leaving the ship), the science team mustered at the stern and awaited further instructions. This is similar to school fire drills, where we go to our designated area, take a headcount, and wait for further directions.

The next drill that we participated in was the “abandon ship” drill. We meet at our muster station with our lifevest and survival suit. The survival suit is made of neoprene and is designed to keep our body temperature stable so we don’t succumb to hypothermia before being rescued.

You might be wondering (as I did), how can someone get hypothermia in warm water?
While the water in the Gulf may be a nice 85℉, our bodies sit at 98.6℉. This means the ocean would slowly absorb your warmth and cause your core body temperature to drop. Check out this fact sheet on how to put on the survival suit (immersion suit) https://www.fisheries.noaa.gov/s3//2024-09/NOP-Observer-Immersion-Suit-2023.508.pdf

The third drill we learned about is the “mariner (man) overboard” drill. If someone were to end up in the water it is everyone’s job to stop, point directly at the person, and never take your eyes off them. This allows the crew to follow recovery procedures to save the mariner.

photo of a quarter-sized piece of paper slipped into a plastic holder mounted on a metal door. this is the emergency billet. It is titled: Sci Black, Amelia. Three sections, color-coded, show the different emergency codes and muster stations. — Assigned stations for drills.

After the drills, the science team returned to the dry lab, and I met the crew members I will be working alongside. The work rotations are split into two 12-hour shifts, day and night. I’ve been assigned day shift, working 11:30am to 11:30 pm.

We reached our first survey station at 2100 hours (9pm) and the real work began!

Did You Know?

NOAA Ship Oregon II uses sensors to report up to date weather data every hour. Follow along at https://www.windy.com/station/ship-wtdo?waves,27.501,-92.356,8,m:esbadxt to map my progress through the Gulf.

Speaking of sensors, I met Dorothy and Toto, right here on this ship! Check out my next blog to learn about Dorothy and Toto.

Adventure awaits!

Sources

July 7, 2026July 8, 2026

Guy Sturdevant: The Cave part 2, July 6, 2026

NOAA Teacher at Sea

Guy Sturdevant

Aboard Oscar Dyson

June 21 – July 15, 2026

Mission: Summer Pollock Acoustic Survey, Leg 2

Geographic Area of Cruise: Bering Sea, Alaska

Date: July 6, 2026

Weather Data from the Bridge

N 59.52° W 172.60 °, 0 AMSL

Conditions: Overcast, Seas at < 1’

Visibility: >5 NM

Wind: 90°/ 5 kt

Barometric Pressure 1016.1 mBar

Dry Bulb Temp: 45.3 ° F

Science Log

In my last post, we left off our acoustics 101 with the emergence of the first modern echosounders in the 1990s. Today, we will look at the current system aboard Oscar Dyson and learn how the science team can use their knowledge of acoustics to estimate fish populations. First, let’s look at the physical components that make up the EK80 echosounder system.

the EK80 echosounder system, which looks like a stack of black computer housings with cables sticking out of them — *Each frequency requires its own transceiver. These six transceivers are the heart of the EK80 echosounder.*

Transceiver – a combination of a transmitter and a receiver; in other words, it both produces an electrical pulse to be sent to the transducer and converts the backscattered signal into usable data a computer can understand. You can think of the transceiver as the electronic brain that manages all of the signal inputs and outputs.

Transducer – Just like you might plug a microphone into your laptop to record audio, each transceiver needs a transducer to first convert the electrical pulse into an acoustic pulse that is transmitted into the water, and to measure the acoustic backscatter that returns. You can actually see the transducers in the photo of the centerboard below. The transceivers measure frequencies ranging from 18 kHz (those really annoying mosquito ringtones that only young people can hear are around 18 kHz) to 330 kHz.

close-up view of a center board - normally mounted beneath the ship, but currently hoisted up in the air attached to some sort of crane. an arrow points out red circles at the base of the centerboard, identifying these as transducers

simple illustration of NOAA Ship Oscar Dyson with an arrow pointing out the acoustic centerboard, a panel sticking vertically downward from the hull of the ship

A) The red circles on the bottom of the centerboard are the faces of the transducers. These sensitive instruments are mounted at the lowest point of the ship to isolate them from the vessel’s noisy hull. (Photo credit: NOAA)

B) The acoustic centerboard protrudes well below the noisy hull-water interface. (Image: Annotation of illustration by The Scow.)

The Echogram

Once the transceivers process the acoustic backscatter, the data is displayed on a screen for interpretation.

screenshot of acoustic backscatter readings, represented as a color-coded dots, across several panels. a superimposed text box identifies the depth as 109.5 m. — There’s quite a lot going on here! Let’s break it down into smaller pieces so we can learn to look at the data like a scientist.

the previous image of acoustic backscatter readings is repeated here, now with annotation. six vertical panels are identified with different frequencies: 18 kilohertz, 38 kilohertz, 70, 120, 200, 330. along the base of these panels, Guy has added a two arrow ranging from "bigger reflectors" to the left to "smaller reflectors" to the right. An illustration of a cod is at the "bigger reflectors" end of the scale, while krill and copepods appear toward the right side of the range. on the left side of the backscatter panels, there are now a few words along the y-axis, identifying the Surface of the water; the "Munge" (using the mock up album cover) just beneath the surface, Fish question mark in the middle of the water column, and seabed. — Each of the six frequencies appears as a vertical section that scrolls from right to left as the vessel moves. The top of each plot represents the ocean surface, and the thick red layer near the bottom shows the seafloor. The space in between lets us look at what is below the ship! Weak backscatter appears blue; stronger backscatter appears yellow and even red.

Our old friend munge is making an appearance in this echogram! It is the heavy backscatter layer just beneath the surface that is strongest at 18 kHz. Lower in the water column, we see that most backscatter occurs at higher frequencies, with only sparse backscatter in the lower-frequency plots. Backscatter that is observed only at higher frequencies indicates smaller organisms, such as krill or copepods. Backscatter that appears across all frequencies is likely generated by fish.

As you spend more time looking at this scrolling echogram, you can begin to recognize patterns and draw reasonable inferences. Below are some examples of the variety you can see in just a few hours in the cave.

a close up view of three panels (three frequencies) of an acoustic backscatter plot, or echogram. an arrow points to a thin vertical patch of red to identify it as "probable schools of juvenile pollock" — *Younger pollock can gather in schools 20-40 meters tall that appear as very thin red ellipses.*

close-up view of panels of an echogram showing acoustic backscatter readings. an arrow points to blue dots in the 18 kilohertz panel and identifies them as possible dispersed adult pollock. — You can clearly see occasional reflectors on the 18 & 38 kHz channels; these may well correspond to adult fish. The only way to be certain is to trawl in an area that looks like this and see what the net brings up!

example of an echogram (acoustic backscatter plot) with very little shading and few dots. it is labeled "Nobody is home." — *We know that large fish like pollock return a relatively even acoustic signal across every channel that we look at; there do not appear to be any significant pelagic fish present in this echogram.*

Now that we can read echograms, we are ready to call for our first trawl! Come back next time to see what we data we can scoop up in “The Anatomy of a Midwater Trawl”.

Personal Log

Things aboard Oscar Dyson have settled into a routine. We travel along acoustic transects during daylight hours, stopping 2-3 times a day to do a midwater trawl. Routine doesn’t mean boring, though! Maintaining a ship of this size and complexity is more than enough to keep everyone busy. The checklist for this leg included checking on the smaller craft that service and support Oscar Dyson on her mission. Conditions cleared on 06/29, and the Peggy D, the workboat that lives on the starboard hero deck, was given a thorough check and taken for a 30-minute voyage.

a small boat with a blue hull attached to the deck of NOAA Ship Oscar Dyson, in part by cables extending from davit arms. — *Peggy D secured to the aft hero deck of Oscar Dyson.*

a man and a woman in float coats and hard hats pose for a photo against the railing of the small boat as it churns away from NOAA Ship Oscar Dyson, visible on the horizon — *Peggy D secured to the aft hero deck of Oscar Dyson.*

Guy, wearing a life vest and neon green hard hat, takes a selfie on the small boat. we can see a woman in a float coat and hard hat sitting or crouching in the background, and a third person at the helm in the small boat's cabin. — *LCDR LeeAnn Keener and I enjoying the scenery.*

inside the small boat's cabin, Guy sits at the helm and another crewmember looks on. they both wear life vests and hard hats. — *LCDR LeeAnn Keener and I enjoying the scenery.*

first of three similar images: a person in a float coat and hard hat reaches a pole over the side of the small boat in motion

second of three similar images: a person in a float coat and hard hat reaches a pole over the side of the small boat in motion as a life preserver comes into view

Safety drills and practice are a part of the routine as well. ENGR Connor Rauch practices recovery during a man-overboard drill on Peggy D. In the case of an actual man overboard, the smaller vessels are used for recovery, as they can respond much more nimbly and are far safer in close quarters with a swimmer.

Wildlife

a very, very round fish, mouth agape, in a green plastic basket — *This smooth lumpsucker (Aptocyclus ventricosus) is just as surprised to see me as I am to see him.*

underside of the very, very round fish revealing its ventral suction disk — *This smooth lumpsucker (Aptocyclus ventricosus) is just as surprised to see me as I am to see him.*

July 1, 2026July 1, 2026

Jennifer Widdig: Fair Winds and Following Seas, July 1, 2026

NOAA Teacher at Sea

Jennifer Widdig

Aboard NOAA Ship Thomas Jefferson

June 17 – June 30, 2026

Mission: Hydrographic Survey
Geographic Area of Cruise: Lake Erie and Lake Ontario
Date: Wednesday, July 1, 2026

Weather Data from Oswego, New York

Latitude: 043^o27’N
Longitude: 076^o30’W
Sky Conditions: Partly Cloudy
Visibility: 9 miles
Wind speed: 2 knots
Wind direction: NE
Temperature: 78^oF
Humidity: 82%

Jen, wearing a Teacher at Sea hat, takes a selfie at the railing of NOAA Ship Thomas Jefferson. In the background, rather than water, we see the Port of Oswego: a dock lined with buildings, leading back to warehouses and storage tanks. — Port of Oswego before heading home

Science and Technology Log

Real-World Career Pathways at Sea

Before stepping aboard NOAA Ship Thomas Jefferson, I assumed most of the crew would be scientists. While hydrography is certainly at the heart of the mission, I learned that it takes professionals from many different career fields to keep the ship operating safely and efficiently. In fact, many of the jobs on board connect directly to the career pathways offered where I teach, Pickaway-Ross Career & Technology Center.

screenshot of a website listing 12 course names with accompanying photos. examples of courses include automotive, culinary arts, electrical. — PRCTC’s list of programs (Credit: PRCTC)

screenshot of a website listing 11 course names with accompanying photos. examples of courses include health science, law and public safety, precision welding.

The survey technicians are responsible for collecting and processing hydrographic data using multibeam sonar, side-scan sonar, GPS, and specialized computer software. Their work combines engineering technology, robotics, and cyber security & networking.

The deck department operates cranes and davits, launches and recovers the survey boats, performs maintenance, handles lines during docking, and ensures the safe operation of the vessel. These careers require technical skills, teamwork, problem-solving, and attention to safety which are qualities developed through career and technical education programs. Especially since we train our students in Lean Six Sigma.

a launch vessel, still attached by cables to davit arms, is lowered down the side of NOAA Ship Thomas Jefferson. Crewmembers in hard hats and life vests stand nearby or board the small vessel. — Bosun Alex Bischoff helping 2904 crew aboard

Behind the scenes, the engineering department keeps the ship running 24 hours a day. Engineers maintain the propulsion systems, generators, pumps, electrical systems, and countless pieces of equipment that allow the Thomas Jefferson to complete its mission. Students pursuing careers in diesel technology, industrial maintenance, electrical trades, or advanced manufacturing would recognize many of the same hands-on skills used every day aboard ship.

The bridge is staffed by NOAA Corps officers, who are responsible for safely navigating the ship, supervising survey operations, managing personnel, and making operational decisions. Their careers combine leadership with navigation, meteorology, technology, project management and safety. These officers work very similarly to the students in the Public Safety course at PRCTC.

at least 8 NOAA Corps officers, wearing navy blue uniforms and hats, stand in a line on the bridge of NOAA Ship Thomas Jefferson. They all face out the windows, away from the camera; some look down at screens and instruments on the bridge. — Officers working the bridge on NOAA Ship *Thomas Jefferson*

Even the steward department plays a vital role. Preparing three meals a day for a crew working long hours requires planning, organization, food safety knowledge, inventory management, and culinary skills. The galley keeps morale high and ensures everyone has the energy needed to perform demanding work much like our commercial foods program.

The Thomas Jefferson also relies on electronics, communications, information technology, logistics, administration, and medical support. Every member of the crew contributes specialized skills that allow the ship to operate as a single, coordinated team.

One of the biggest takeaways from this experience is that there isn’t just one pathway to working aboard a ship like the Thomas Jefferson. Whether your interests are welding, diesel technology, engineering, information technology, culinary arts, electronics, leadership, or science, there is a place where those skills can make a difference.

As a teacher at Pickaway-Ross CTC, this experience has given me real-world examples to bring back to my classroom. Now I can point to an entire ship where technical skills, problem-solving, teamwork, and communication are used every single day. Career and technical education doesn’t just prepare students for jobs, it also prepares them for opportunities they may have never imagined, including serving aboard a NOAA hydrographic survey vessel.

Clearing the Way

While the NOAA Ship Thomas Jefferson is best known for charting U.S. waters, the ship can also play a critical role in responding to natural disasters.

In 2017, after Hurricane Maria devastated Puerto Rico and the U.S. Virgin Islands, the Thomas Jefferson was deployed to help restore safe navigation to the region. Using its multibeam sonar and side-scan sonar systems, the crew surveyed ports and waterways to identify underwater hazards and ensure safe passage for the U.S. Coast Guard, relief vessels, and other emergency responders. Because so many essential supplies reach the islands through these ports, reopening them quickly was vital to the recovery effort.

Over the course of just three weeks, the Thomas Jefferson surveyed 13 areas, including more than 18 ports, helping authorities safely resume maritime traffic.

a nautical chart of the water surrounding Puerto Rico and the Virgin Islands. 13 boxed map insets show enlarged views of survey areas and the color-coded shading of depth measurements. these surveyed areas represent all the major ports. there are three photos also superimposed on the map: one of NOAA Ship Thomas Jefferson and two of survey launch vessels. — Areas surveyed by NOAA Ship *Thomas Jefferson* after Huricane Maria in 2017 (Credit: NOAA)

One of the ship’s greatest strengths is its ability to operate independently. With a crew of 38, the Thomas Jefferson can remain at sea for several weeks without relying on outside support, making it an ideal platform for extended emergency response missions. Its two survey launches, 2903 and 2904, further enhance its capabilities by allowing crews to survey shallow waters and areas where storm debris may have accumulated.

Learning about the Thomas Jefferson‘s role after Hurricane Maria gave me a broader perspective on hydrography. Before this experience, I mainly associated nautical charting with supporting everyday navigation. Seeing how these same surveying skills and technologies can be used to assess storm damage, clear ports, and help restore critical shipping routes showed me just how important this work is. It is another example of how the crew’s expertise extends far beyond routine charting operations.

Personal Log

Unfortunately, I am on my way home. However, I want to share a few last memories from this experience.

The Crew’s Greatest Challenge

I had started to think the crew aboard the Thomas Jefferson was almost flawless, then game night happened.

Communication on the bridge during unfavorable conditions is exceptional. Navigating video games? Not so much.

four men and two women sit around a table covered in a blue table cloth and lines of condiment bottles. the wall behind them is wallpapered in nautical charts. there is a large tv screen mounted on this wall above their heads. — Crew working on their communication skills during game night

The Commanding Officer remained calm, cool, and collected through two weeks of transiting the Welland Canal, changing weather, and demanding survey operations. Yet during game night, I caught a glimpse of what looked like a silent question in the CO’s eyes: “Is this really my crew?” as everyone demonstrated their less-than-stellar teamwork in a video game. I also learned that it is, in fact, possible to earn negative points.

The evening was filled with unforgettable comments like, “I have steak on the starboard quarter!” followed by, “Fish pasta, aye!” and “Who keeps putting the fire extinguisher on the stove?” Somehow, those made perfect sense in the middle of the chaos. And no game night would be complete without a few “passionate” debates over the official rules of Scrabble.

Crew demonstrating teamwork skills during game night

As entertaining as the games were, my favorite part was seeing this side of the crew. After watching them work with such precision and professionalism every day, it was refreshing to see the Commanding Officer and Executive Officer relax alongside everyone else. For a few hours, ranks took a back seat to friendly competition, laughter, and good-natured teasing. It was a wonderful reminder that the strong teamwork I had witnessed throughout the mission is built not only through hard work, but also through shared moments like these.

at least 8 people in a room at two different tables; the back table is focused on the video game displayed on a large monitor mounted on the wall, and the table in the foreground has a scrabble game. — Crew of NOAA Ship *Thomas Jefferson* at game night

Sharing the Mission

An exciting part of my journey home was getting the chance to share my experience aboard the Thomas Jefferson with people I met along the way. My Uber driver and the hotel front desk attendant were both curious about why I had been on a NOAA ship, which gave me the opportunity to explain the mission of the Thomas Jefferson and the important work the crew does to create accurate nautical charts and ensure safe navigation. They both had said they had lived here all their lives and never saw a boat like that in the port or knew that the lake was not surveyed. After spending time with the crew, I found myself proudly talking about their work and the dedication it takes to accomplish such an important mission.

Mission Complete

I want to extend my sincere thanks to Commanding Officer Kidd and Executive Officer Duffy for welcoming me aboard and giving me the opportunity to be part of this incredible experience.

I also want to thank the entire crew for making me feel at home from day one. Everyone was so welcoming, patient, and willing to answer my endless questions. A special thank you goes to the survey technicians, who took the time to explain everything to me slowly and more than once when needed. Their patience and enthusiasm for their work made it easy to appreciate the science and technology behind every survey.

two women wearing life vests stand near the railing of NOAA Ship Thomas Jefferson facing out toward the water, opposite the camera. a metal frame containing the conductivity, temperature, and depth probe is partially visible on the deck in front of the woman on the right. a pully on a beam extends into the photo from the right, over the women's heads, and rope hangs on either side of the pully. the sky and water are bright blue. — Chief Scientist Sarah Thompson explaining the Sea-Bird CTD proceedures

I also want to thank my roommate, Junior Officer Bridget Ruiz, for making life aboard so enjoyable. Thank you for your friendship, the great conversations, and for making me feel at home while we were at sea. Sharing this adventure with you made the experience even more memorable.

I feel incredibly fortunate to have been assigned to NOAA Ship Thomas Jefferson. I have a much deeper appreciation for the important work this crew does. More importantly, I am returning home excited to share what I have learned with my students. I hope that through these stories, they will discover careers they may have never considered and see that science can lead to adventures far beyond the classroom.

Fair winds and following seas, Thomas Jefferson. Thank you for an unforgettable journey.

view of NOAA Ship Thomas Jefferson underway on the lake, sailing away from the camera toward the horizon. it appears to be dusk - there is a little color toward the horizon, and a lot of cloud cover. the water is dark blue and still enough to reflect the image of the ship. — NOAA Ship *Thomas Jefferson* on Lake Ontario

July 1, 2026July 1, 2026

Guy Sturdevant: The Cave pt. 1, June 29, 2026

Unexpected sea ice south of St Lawrence island on 6/25

NOAA Teacher at Sea

Guy Sturdevant

Aboard Oscar Dyson

June 21 – July 15, 2026

Mission: Summer Pollock Acoustic Survey, Leg 2

Geographic Area of Cruise: Bering Sea, Alaska

Date: June 29, 2026

Weather Data from the Bridge

N 58.6° W 170.4 °, 0 AMSL

Conditions: Fog, Seas at 4’

Visibility: < 3 NM

Wind: 70°/ 9 kt

Barometric Pressure 29.9 inHg

Dry Bulb Temp: 43 ° F

Science Log

So, we’ve taken a chilly dive into the why behind the focus on the pollock. Today, I will take you into “The Cave,” where we can learn how scientists use sound to locate and count pollock. On the port side of the main deck sits a dark, windowless room lit only by the dozen or so monitors adorning its aft wall. A gentle, constant humming fills the room from racks and racks of electronics, servers, and support equipment that dominate the center of this space. While the OOD on the bridge steers this vessel, “The Cave” calls the scientific shots by determining the ship’s course as well as the timing and location of all science operations.

a man and a woman sit in computer chairs at a desk beneath an array of 8 computer monitors; the large computer stack is visible to the right. the two scientists lean far back in their chairs to look up at the screens above. — Abigail McCarthy and Mike Levine discuss plans for the day shift. Time at sea is precious; this vessel operates 24/7 in all conditions. For the past two days, a very quiet, fishless northern extension has limited opportunities. But remember, even a null result is a result!

Acoustics 101

Since the early 20th century, scientists have used the unique ability of sound waves to transmit very efficiently through water for remote sensing. “Pings” of acoustic energy are generated by a transmitter, and then the backscatter (or reflected sound) is detected by a receiver. Early pioneers used sonar to better understand the physical geography of ocean basins in a process called bathymetry.

a graphic showing a cut-out photo of a ship (USS Stewart, DD-13) at the surface of the ocean (depicted as a blue rectangle) above the seafloor (a brown rectangle.) in the animation, upside-down orange parabolas extend from the bottom of the ship toward the seafloor; then right-side up dotted parabolas, like rainbows, extend back from the seafloor up to the ship's bottom. there is a cutout image of the antique echosounder off to the right. There is a speech bubble containing the equation for seafloor depth. The graphic is titled The North Atlantic, 1922: Acoustic Bathymetry — *USS Stewart first tested an early form of echosounder in 1922 as part of preparations for the installation of the Transatlantic cable.*

Not long after the first echosounders made their way aboard ships, scientists realized that as the quality of the instrument increased, they could measure the backscatter (or reflected sound) off of other objects besides the seafloor. Large backscattering layers far above the seafloor were targeted by fishing vessels using the new technology, demonstrating the effectiveness of echosounders at locating marine organisms throughout the water column.

a static graphic showing a cut-out photo of a ship at the surface of the ocean (depicted as a blue rectangle) above the seafloor (a brown rectangle.) 3 upside-down orange parabolas, representing the wave front, extend from the bottom of the ship toward the seafloor; 3 right-side up dotted parabolas, like rainbows, extend back from the seafloor up toward the ship's bottom, representing seafloor backscatter. cutout images of individual pollock fish are pasted in a "school" in the middle of the blue ocean water, and 3 blue rainbow-oriented parabolas extended up from the fish school, representing fish backscatter. this slide is titled: Acoustic Trawling. — *Early innovators in Norway and England reported success in using echosounders to detect large schools of fish and began actively monitoring their behavior (Balls, 1948)*.

The following decades of acoustic research relied on analog, single-beam systems, which were often towed behind or below a vessel and recorded a narrow swath directly below the ship onto a paper echogram.

composite photo of a porcelain wall showing an echogram. arrows and text have been superimposed on the photo to point out the seafloor backscatter and the school of pollock backscatter. in the lower right are the words NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION. — A 3d porcelain rendering of this now-famous echogram (the recorded chart of an echosounder) from the Shelikof Straight adorns the entry to the NOAA Alaska Fisheries Science Center in Seattle. The strong red and yellow reflections that sweep gently across the bottom represent the strong backscatter from the seafloor, and the large red cloud represents a large school of pollock.

The 1990’s welcomed a new era in echosounder technology with the release of the SIMRAD EK-500. This landmark digital echosounder combined multi-frequency operation with improved data processing and integration tools, enabling much better estimates of fish population density and biomass.

a graph of target strength (low, medium, high) v. frequency (kHz, log scale). three lines graph this relationship for fish (swim bladders) at 50-600 mm length; krill at 10-60 mm length; and copepods 0.2-20 mm length. — Larger acoustic targets, such as the swim bladder of a large fish, produce strong backscatter at relatively low frequencies, whereas smaller organisms, such as krill and copepods, reflect sound only at much higher frequencies. Multi-frequency echo sounder measurements allow scientists to discriminate between acoustic targets of different sizes and target strengths and more accurately estimate the biomass of individual organisms as they scroll across the screen.

Next time, we will look at the echograms produced aboard Oscar Dyson and receive a crash course in interpretation from the Cave!

Personal Log

Work hard, play hard is an unofficial motto aboard Oscar Dyson. The officers, crew, and science team are keeping a fierce eye on the World Cup when off duty (Colombia’s goal call-back was a travesty!!).

a 16-competitor bracket drawn on an old hydrographic chart. beneath the chart is the title: The Inaugural Collin McMillan Memorial Biannual Oscar Dyson Amateur Cribbage Tournament. — *The “Inaugural Collin McMillan Memorial Biannual Oscar Dyson Amateur Cribbage Tournament” is underway; stay tuned for updates and potential video coverage of the championship match!*

Guy, wearing overalls and long yellow gloves, holds up a flatfish pointing toward his face, and makes a kissy face at a safe distance. — The future gyotaku model, Northern rock sole (*Lepidopsetta polyxystra*)*, posing for a picture before her big debut.*

fish print, in black ink, of a flatfish — Gyotaku is the traditional Japanese art of collecting fish prints. Engineer Victoria Southwick, ENS Josh Bennett, and Lt. Jesse Pierce captured the print of a Northern rock sole (Lepidopsetta polyxystra) brought up on haul 71, 06/28/26.

Wildlife sightings

highly detailed photo of an albatross floating at the ocean's surface — A Short-tailed albatross (Phoebastria albatrus) follows us during trawling operations, hoping for a fishy treat. This threatened marine bird is a tale of cautious conservation success. Their population in the 1950s dwindled to as low as 25 individuals. Today, roughly 4,200 individuals are known to exist.

Fun Fact

In the Cave, it is not uncommon for the shallow layer to be filled with a mix of non-fish backscatter. Everyone has their pet theories as to what may be the source of these shallow acoustic targets (we know they aren’t fish), but they have all agreed to call it by one name… munge. Below is my artist’s interpretation of Munge as a heavy metal album.

MUNGE album cover

Sources

Balls, R. 1948. Herring fishing with the echometer. Journal du Conseil International pour l’Exploration de la Mer, 15: 193–206.
Korneliussen, R. J. (2018). Acoustic target classification.
Benoit-Bird, K. J., & Lawson, G. L. (2016). Ecological insights from pelagic habitats acquired using active acoustic techniques. Annual review of marine science, 8, 463-490.
Mordy, C. W., Bond, N. A., Cokelet, E. D., Deary, A., Lemagie, E., Proctor, P., … & Wisegarver, E. (2023). Progress of fisheries-oceanography coordinated investigations in the Gulf of Alaska and Aleutian Passes. Oceanography, 36(2/3), 94-100.
De Robertis, A., McKelvey, D. R., & Ressler, P. H. (2010). Development and application of an empirical multifrequency method for backscatter classification. Canadian Journal of Fisheries and Aquatic Sciences, 67(9), 1459-1474.
Simmonds, J., & MacLennan, D. N. (2008). Fisheries acoustics: theory and practice. John Wiley & Sons.
Holliday, D. V., & Pieper, R. E. (1995). Bioacoustical oceanography at high frequencies. ICES Journal of marine Science, 52(3-4), 279-296.
Echoview. (2019). Acoustics Unpacked. https://acousticsunpacked.echoview.com/acoustics/AcousticsUnpacked.asp

June 30, 2026July 7, 2026

Amelia Black: From the Kansas Prairie to Gulf Seas, June 28, 2026

Amelia takes a selfie with a historic tall ship in the background.

NOAA Teacher at Sea

Amelia Black

Aboard NOAA Ship Oregon II

July 6-17, 2026

Current School: Williams Science and Fine Arts Magnet Elementary, Topeka Public Schools (USD 501)

Upcoming School: Jardine Middle School, Topeka Public Schools (USD 501)

Mission: SEAMAP Summer Groundfish Survey

Geographic Area of Cruise: Gulf of America/Gulf of Mexico

Date: June 28, 2026

Personal Log

At the USS Constitution in Boston with a group of History educators from Kansas.
From June 2026, headed from Kansas to Boston.
Taking a group of teachers to learn about Windfarms at Fort Hays, Kansas.

Hello, all, my name is Amelia Black and I am a proud Kansas public school teacher. I have been a teacher for over fifteen years with Topeka Public Schools (USD 501). Transitions, geography, incredible adventures, and connectivity is the theme for this summer.

One big transition for me will be happening this this coming school year as I move from teaching elementary ESOL ( English as a Second Language) to middle school. I will be transitioning to a new school and starting the next journey in my teaching career, teaching newcomers ELs (English Learners) at Jardine Middle School. Newcomers are students who are new to America, who often arrive speaking little or no English. I love working with my students, as well as other educators and helping them both to find their strengths, their voice, and empowering them through learning and inquisitiveness. My favorite part of being an educator are the moments when new understand or a new skill clicks and they have a ‘light bulb moment’. Seeing the understanding dawn is an amazing part of teaching.

Before I set up my new classroom, I am embarking on an incredible new adventure with NOAA (National Oceanic and Atmospheric Administration) as part of the Teacher at Sea (TAS) Program. I will leave Kansas on America’s 250th birthday (Independence Day) and I will be trading landlocked Kansas for open waters aboard the NOAA Ship Oregon II!

During this adventure, I will be learning from some amazing scientists and crew members as part of NOAA’s Summer Groundfish Survey. When I step onto the ship, I will be a “newcomer” myself. In addition to learning new vocabulary, scientific language, and marine culture, I will be getting my ‘sea legs’ as I learn how to navigate on a 170-foot fishing vessel. This will be a whole new adventure for me and as a life-long learner something I am truly excited to experience. I want my students to see that it is okay to try new things and step out of your comfort zone, that it is okay to be nervous when you learning something new and in a brand-new place. By stepping out of my comfort zone and working alongside NOAA scientists, I want to model resilience, curiosity, and bravery. Skills that I know my language learners experience as immigrants to America.

You might be wondering, what is an ESOL teacher doing going on scientific exploration? The answer is in connectivity. Connectivity between language, reading, science, and social studies. STEAM (Science, Technology, Engineering, Art, and Mathematics) AND Social Studies are essential for building background knowledge, academic vocabulary, and conceptual understanding. All components that are integral to comprehending complex texts and bring the joy of learning to the classroom.

As a passionate advocate for social studies, I serve on the board of the Kansas Geographic Alliance (KGA) and as a coordinator of their annual P4 Summer Institute (Plants, People, Places, Patterns). In this role I am given the opportunity to work alongside inspiring educators from across Kansas to explore and advocate for geography and social studies. Connectivity extends geographically: our rivers in Kansas lead to our oceans. The Midwestern watersheds affect our marine ecosystem in the Gulf. In participating in this experience, I will be able to bring back my learning and experiences not just to my students but to educators and others throughout Kansas.

To all my amazing students, families, and friends: I hope you are able to follow along this journey with me and I cannot wait to take you all on this learning experience. So get your maps out and follow along as we set off from Kansas to the Gulf of America/Mexico starting at Pascagoula, Mississippi.

Kansas Learning Log

Part of being a good educator is being prepared, so as I start this journey I want my log to reflect my learning but also the interconnectivity of science, social studies, and many other disciplines. The NOAA (National Oceanic and Atmospheric Administration) TAS (Teacher at Sea) Program has a blog format that I will be following in future blogs. The blog outline will start with Weather Data from the Bridge and a Scientific Log before my personal log. Each log will end with a fun learning opportunity or a sneak peak, you will have to read to find out! For this intro blog, I wanted to give you all a look at the Weather Data from Topeka, Kansas as well as a little information about this fantastic landlocked state.

Weather Data from Topeka, Kansas
Latitude: 39.0483^o N
Longitude: -95.6780^oW
Elevation: 945 feet (288 meters) above sea level
Wind Speed: 15mph (13 knots)
Wind Direction: South (180^o)
Visibility: 10 miles (8.69nm)
Air Temperature: 93^o F, heat index of 108^o F
Barometric Pressure: 29.64 Hg (1003.73)
Sky: Mostly clear

A Little Bit about Kansas (Science and Technology Log)

You might already know a few things about Kansas. In addition to being a fly over state (thank you, Jason Aldean), Kansas is located in the middle of the United States. Kansas is the geographic center of the 48 contiguous United States (https://www.ngs.noaa.gov/PUBS_LIB/GeoCenter_USA1.pdf). In fact, prior to modern mapping technology advancements a ranch in Osborne County, Kansas was the official geodetic center of North America. This meant that all the maps created for the United States, Canada, and Mexico used this Kansas ranch as their reference point. https://www.penryfamily.com/geographicalcenters/meadesranch.html

Most people assume that Kansas is flat. However, the eastern part of Kansas is part of the Flint Hills and has some breathtakingly beautiful rolling hills and prairies. Additionally, the elevation of Kansas rises steadily from east to west. The lowest point of Kansas is 679 feet above sea level and the highest point is over 4,000 feet above sea level!

an elevation map of Kansas set against a white background. The counties are marked in gray lines. The lowest elevation, 679 ft, is colored dark blue. Relatively low-lying river valleys extend in feathery fingers away from the eastern border of the state, fading toward green, and finally toward a dark maroon patch (4039 feet) along the western border. — Color Elevation Map of Kansas from KU GeoKansas
image from: https://geokansas.ku.edu/color-elevation-map-kansas

Did You Know?

NOAA Ship Oregon II samples ocean habitats spanning all the way from Florida to Texas!

Sources
https://www.ngs.noaa.gov/PUBS_LIB/GeoCenter_USA1.pdf
https://www.travelks.com/listing/geographic-center-of-48-contiguous-states/2307/
https://www.penryfamily.com/geographicalcenters/meadesranch.html
https://geokansas.ku.edu/color-elevation-map-kansas