Porpoise – NOAA Teacher at Sea Blog

July 10, 2023July 19, 2023

Lisa Carlson: One Fish, Two Fish, Rockfish, Hake fish! July 10, 2023

NOAA Teacher at Sea

Lisa Carlson

NOAA Ship Bell M. Shimada

July 5, 2023 – July 19, 2023

Mission: Fisheries: Pacific Hake Survey (More info here)

Geographic Region: Pacific Ocean, off the coast of California

Date: July 10, 2023

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Weather Data from the bridge:

July 7 (1200 PT, 1500 EST)
Location: 36° 00.4’ N, 122° 05.9’ W
16nm (21mi) West of Big Sur, CA

Visibility: 10 nautical miles
Sky condition: Overcast
Wind: 20 knots from NW 330°
Barometer: 1013.1 mbar
Sea wave height: 3-4 feet
Swell: 6-7 ft from NW 320°
Sea temperature: 14.0°C (57.2°F)
Air temperature: 14.4°C (57.9°F)
Course Over Ground: (COG): 323°
Speed Over Ground (SOG): 10 knots

July 8 (1200 PT, 1500 EST)
Location: 36° 34.5’ N, 122° 05.3’ W
17nm (20mi) Southwest of Monterey, CA

Visibility: 10 nautical miles
Sky condition: Few clouds
Wind: 19 knots from NW 330°
Barometer: 1013.8 mbar
Sea wave height: 5-6 feet
Swell: 6-7 ft from NW 330°
Sea temperature: 14.0°C (57.2°F) 13.7
Air temperature: 14.4°C (57.9°F) 14.3
Course Over Ground: (COG): 089°
Speed Over Ground (SOG): 10 knots

July 9 (1200 PT, 1500 EST)
Location: 37° 06.8’ N, 123° 00.5’ W
30nm (35mi) West of Pigeon Point Light Station, Pescadero, CA

Visibility: 10 nautical miles
Sky condition: Overcast
Wind: 13 knots from NW 332°
Barometer: 1016.0 mbar
Sea wave height: 2-3 feet
Swell: 4-5 ft from NW 310° 4-5
Sea temperature: 14.3°C (57.7°F)
Air temperature: 15.2°C (59.4°F)
Course Over Ground: (COG): 093°
Speed Over Ground (SOG): 10 knots

July 10 (1200 PT, 1500 EST)
Location: 37° 26.7’ N, 123° 06.4’ W
32nm (37mi) West of Pescadero, CA

Visibility: 8 nautical miles
Sky condition: Overcast, fog in vicinity
Wind: 20 knots from NW 330°
Barometer: 1015.9 mbar
Sea wave height: 2-3 feet
Swell: 3-4 ft from NW 320°
Sea temperature: 14.5°C (58.1°F)
Air temperature: 13.6°C (56.5°F)
Course Over Ground: (COG): 314°
Speed Over Ground (SOG): 3 knots

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Science and Technology Log

Lisa poses for a photo in the wet lab with a hake fish. She's wearing heavy-duty orange overalls and large orange gloves. With her right hand, she grasps the fish by its open mouth, and her left hand holds on to the tail. We can see metal tables and equipment in the background. — Me holding a Hake before sorting. After observation, we determined this was a developmentally mature female, measuring 50cm (20in) long!

In my July 6 blog post, I explained how NOAA Ship Bell M. Shimada is equipped to collect acoustic data in the form of echo grams. The acoustics team uses the data to determine if there are enough return signals to suggest fish are present and attempt a trawl. In this blog post, I will explain how we get the fish onboard, and what we do with the sample of marine life once it is collected from the net.

One question I had after learning about the acoustics and environmental DNA (eDNA) pieces of the survey mission was, “How does physically collecting and researching Hake samples fit into the puzzle of understanding their ecosystem and supporting sustainable fisheries?” (NOAA Fisheries quick facts and video here)

“While echosounders are useful, they do not provide certain quantitative data that researchers need to understand the ecology of these organisms and the midwater zone. To collect quantitative data, such as biomass, length and weight, and age class distributions, researchers must gather representational samples and take direct measurements of them. The best way to do this is by employing trawls.”
NOAA Ocean Exploration: “Trawls”

So, although acoustics and eDNA research is important to the overall survey, they are only pieces of the puzzle, and the puzzle is not complete without conducting trawls and physically researching samples. NOAA Ship Bell M. Shimada uses a midwater trawl net that is deployed from the stern over the transom, and towed behind the vessel. As the name suggests, midwater trawls occur in the middle section of the water column, versus surface and bottom trawls. The net is conical in shape and uses two metal Fishbuster Trawl Doors, and two sets of heavy chain links called Tom weights, in order to keep the trawl in the middle of the water column.

a simple and stylized monochrome illustration of a fishing vessel towing a midwater trawl behind it. The net in tow is conical, attached at four points to two bars that hold the opening apart, and these bars are attached to lines (ropes) extending back from the vessel. This net is capturing two fish and missing a third. — NOAA Fisheries: “Fishing Gear: Midwater Trawls”

“The midwater region is especially important because the creatures that inhabit it constitute the majority of the world’s seafood. Understanding the ecology of midwater organisms and their vast environment can provide us with better information to manage these important natural resources and prevent their overexploitation.”
NOAA Ocean Exploration: “Trawls”

Deck department assisting in recovering the trawl net after a successful deployment.

Two deck crewmembers work with an orange and white fishing net on the aft deck of NOAA Ship Bell M. Shimada. They are wearing foul weather gear, life vests, and hard hats. At right, one leans over the net, searching for remaining captured fish. The other approaches from the left, looking down at the net, to assist. We can see a cloud-capped mountain range in the distance beyond the water.

Once the net is onboard, the net is emptied one of two ways depending on the size of the sample. For large samples, marine life is deposited into a hopper and subsequent conveyor belt. For smaller samples, the Hake will be put into a large basket then divided into smaller baskets of approximately 100 Hake each. Any other marine life like Salps, Myctophids, Pyrosomes, Rockfish, King of the Salmon, and small bony fish, etc. are recorded in the database and returned to the ocean.

“The ship’s wet lab allows scientists to sort, weigh, measure and examine fish. The data is entered directly into the ship’s scientific computer network.”
NOAA Office of Marine and Aviation Operations (OMAO): “Bell M. Shimada”

a large black plastic bin filled with fish - mostly hake, but a few splitnose rockfish (eyes bulging from the pressure change) stand out for their red color. An orange-gloved hand reaches toward the basket from the upper left corner of the image.

Large basket containing a sample of Hake with a few (red) Splitnose Rockfish.

a view of NOAA Ship Bell M. Shimada’s Wet Lab with multiple scales, Ichtystick electronic measuring boards, trawl camera, vials for otolith (ear) bones, disposal chute, and tools including scalpels, tweezers, and knives. — NOAA Ship *Bell M. Shimada’s* Wet Lab with multiple scales, Ichtystick electronic measuring boards, trawl camera, vials for otolith (ear) bones, disposal chute, and tools including scalpels, tweezers, and knives.

Maddie, in the wet lab, holds a hake fish up for a photo. She is wearing a long-sleeved shirt, heavy-duty orange overalls, and large orange gloves. Her hair is tied back in two double braids and topped with a teal bandana. She holds the fish in two hands, horizontally, at the level of her mouth, so we cannot see her smiling, but we can see her arch her eyebrows as she looks straight at the camera. — NOAA Ship *Bell M. Shimada’s* Wet Lab with multiple scales, Ichtystick electronic measuring boards, trawl camera, vials for otolith (ear) bones, disposal chute, and tools including scalpels, tweezers, and knives.

With our boots and bright orange rubber pants and gloves on, our first task is to distribute the sample of Hake into baskets of about 100 each. Based on how many baskets we fill, a random selection of baskets will be kept, and the others will be returned to the ocean. With the remaining groups of Hake, we determine their sex and length.

In order to do this, we use a scalpel to make an incision on the underside/belly of the Hake. Once open, we are able to examine their organs, including the gonads to determine if the fish is male or female, and if they are developmentally immature or mature. Young Hake are difficult to sex, and it takes practice to get over any initial fears of cutting into an animal; let alone being able to locate and identify the gonads. Hake usually spawn in early winter, so many of the smaller Hake we sample from during the summer are age one or younger.

Our largest Hake thus far was a developmentally mature female, measuring 50cm (20in). In order to accurately and consistently measure the length of the sample, we use a waterproof, magnetic plastic board with metric (centimeter and millimeter) markings called an Ichthystick (think: high-tech meter stick). The fish is placed on the board with its mouth touching the black board at 0cm, then a magnetic stylus is placed at the fork of the fish’s tail. Once the magnetic stylus is placed on the board, the length to the nearest millimeter is displayed on the LCD screen and automatically entered into the database program. The length data is grouped with the date, time, and identified sex for later observation and comparison.

Additional information, abstracts and outline about Ichthystick here

Ichthystick’s LCD display, motherboard, magnetic board, and magnetic stylus. Digital scale in background.

An even smaller subgroup is then selected and examined to record weights of individual Hake, collect ear bones called Otoliths for aging, stomach samples for diet, liver for RNA, and ovaries for maturity development. Otolith bones help determine the age of the Hake because they grow a new “layer” of bone each year, similar to coral structures and annual tree rings. Organs and bones removed from the Hake are sent to NOAA Fisheries centers for analysis and included in databases with the date, identified sex, length, weight, and location in which they were collected.

This data is used to build more of the puzzle, along with acoustical information, water samples, and eDNA data in order to further understand the ecosystem, biomass, diet, and

“support sustainable populations of Pacific hake on the West Coast.” (…)
“It provides vital data to help manage the migratory coastal stock of Pacific hake. The hake survey, officially called the Joint U.S.-Canada Integrated Ecosystem and Pacific Hake Acoustic Trawl Survey, occurs every odd-numbered year.”
NOAA Fisheries: “Joint U.S.-Canada Integrated Ecosystem and Pacific Hake Acoustic Trawl Survey”

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Personal Log

Although this subtopic of explaining the Integrated Ecosystem and Pacific Hake Acoustic Trawl Survey is a bit easier to understand than my July 6 Acoustics Lab post, it certainly does not mean it’s an easy task!

When I had a tour on July 4, I remarked how clean and organized the Wet Lab is. I hadn’t see it in action yet, but noticed how everything had its place and use. On July 6 we conducted our first trawl and collected a sample of 11 baskets of Hake (approximately 1,100 Hake since we group about 100 Hake together in each basket.) From that sample, we kept four baskets and counted, sexed, and measured 541 Hake.

Five of us were working together in the Wet Lab for that haul. I’ll admit I probably didn’t sex 100+ Hake. It took a few minutes of watching the others carefully and swiftly cut into the underside of a fish, open the two sides, and know what to look for to determine the sex of very young Hake. Eventually I found the courage to slice in and take a look. By the fourth or fifth Hake, the uneasiness had subsided and I found the process very interesting and educational. Although young samples are hard to sex as they are often undeveloped, the others encouraged me and answered my questions and guesses with enthusiasm and support.

While working on measuring the lengths of our samples, one Science Team member paused and remarked how beautiful he found the fish. Although they do not have vibrant, bold colors, shimmering scales, or anything else particularly remarkable, he found the beauty in them. He digressed into a conversation of their role in the ecosystem, how they are living and breathing creatures, and how they probably all have their own personalities and slight physical differences. I noticed some of their eyes were shiny and sparkling, and how their faces and expressions were noticeably unique the more you looked. That “down to earth”, heartfelt discussion was very special and demonstrated how the crew respects the process of catching and sampling Hake, while keeping each other and marine mammals safe.

From the NOAA Corps Officers, to the deck department, to the engineers, electronics, science team, survey team, galley crew, volunteers, and everyone in between; the crew on NOAA Ship Bell M. Shimada is special. They take pride in their vessel and job, and always seem to have a smile and kind greeting. Being away from land and loved ones for weeks and months at a time will certainly take a toll on the body and mind, but this team is there for each other. To all of the crew, thank you for making me feel so welcomed and appreciated. We’re almost halfway through the mission, and as tired as I may get after (sometimes) 12+ hour days, I sleep well knowing the crew trusts their vessel and each other; and look forward to learning and becoming more and more acquainted each day with the people that make this mission possible. Thank you!

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Did You Know? (FAQs)

1. Are you finding schools of them?

We’ve had seven successful trawls out of nine attempts for Pacific Hake fish. They often come with pyrosomes (Sea Pickle) myctophids (Lanternfish), and salps in the net too. Some trawl attempts are successful without a hitch, but more often than not we have to restart our Marine Mammal watches a few times before deploying in order to keep our ocean life safe and not get tangled in the net. Two trawl attempts have been abandoned because of the amount of persistent marine mammal life and playfulness near the ship. (I think they know we’re watching and show off for our cameras.)

2. What’s your average depth?

The transects (Set and numbered longitudinal east-west lines NOAA Ship Bell M. Shimada navigates on while collecting acoustic data) usually range from 50m – 1,500m (164ft – 4,921ft) in depth.

However, right now one of the displays in the Acoustics Lab, the depth reading is 3,240m which is about 10,630ft or just over two miles deep!
This depth is only 1,870ft shallower than the wreck of the RMS Titanic!
(We were on a long transect, we do not often see depths this great.)

3. Have you gotten seasick? Seasickness should subside after about 3 days.

I’ve never gotten seasick thankfully! Knock on wood and all the other premonitions, please.

4. What is the Hake role in the ecosystem?

More info on this coming in later posts after explaining our Chemistry lab and technology aboard!

However, as predators, they can be cannibalistic towards their own kind.
As far as their role in human consumption: They are often used as a substitute for Cod and Haddock, and in fish sticks and imitation crab meat.

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Animals seen July 5-July 10:

Mammals: Sea Lions, Harbor Seals, Dall’s Porpoise, Risso’s Dolphins, Pacific White-Sided Dolphins, Northern Right Whale Dolphins, Humpback Whales

Birds: Gulls, Black-Footed Albatross

Bony Fish: Hake, Lanternfish (Myctophid), Flatfish, King of the Salmon, Split Nose Rockfish, Chili Pepper Rockfish

Other Marine Life: Giant or Humboldt Squid (15 foot tentacles in trawl), Spiny Dogfish Shark, Shrimp, Plankton, Krill, Sea Pickle (Pyrosome), Salp, Eel Larva

a spiny dogfish - a species of small shark - placed on a fish measuring board atop a metal table. a scale is visible next to the measuring board. — Spiny Dogfish Shark (42cm or 16in long)

three impressively long squid tentacles laid out on the floor; they are orange-brown on top, and white underneath, lined with white suckers (suction cups) of varying size — Spiny Dogfish Shark (42cm or 16in long)

July 13, 2011April 28, 2021

Kathleen Harrison: Shumagin Islands, July 9, 2011

NOAA Teacher at Sea
Kathleen Harrison
Aboard NOAA Ship Oscar Dyson
July 4 — 22, 2011

Location: Gulf of Alaska
Mission: Walleye Pollock Survey
Date: July 9, 2011

Weather Data from the Bridge
True wind direction: 59.9°, True wind speed: 11.44 knots
Sea Temperature: 9°C
Air Temperature: 8.9°C
Air pressure: 1009.74 mb
Foggy with 1 mile visibility
Ship heading: 88°, ship speed: 11 knots

Science and Technology Log

The Shumagin Islands are a group of about 20 islands in the Gulf of Alaska, southwest of Kodiak Island. They were named for Nikita Shumagin, a sailor on Vitus Bering’s Arctic voyage in 1741. They are volcanic in origin, composed mostly of basalt.

Several islands even exhibit hexagonal basaltic columns. There are about 1000 people who reside in the islands, mostly in the town of Sand Point, on Popof Island. According to the United States Coast Pilot (a book published by NOAA with extensive descriptions about coastlines for ship navigation), the islands extend out 60 miles from the Alaskan Peninsula. They are bold and mountainous.

The shores are broken in many places by inlets that afford good anchorages. The shores are rockbound close to. Fishing stations and camps are scattered throughout the group, and good fishing banks are off the islands. Fox and cattle raising are carried on to some extent.

long range view of SI, Alaskan Peninsula — Shumigan Islands to the left, snow covered peaks of Alaskan Peninsula in background. An amazing sight on a rare sunny day in the Gulf of Alaska.

Sea water quality is very important to the scientists on the Oscar Dyson. So important, that it is monitored 24 hours a day. This is called the Underway System. The sea water comes through an intake valve on the keel of the bow, and is pumped up and aft to the chem lab. There, it goes through 4 instruments: the fluorometer, the dissolved Oxygen unit, the Thermosalinograph (TSG), and the ISUS (nitrate concentration).

The fluorometer measures the amount of chlorophyll and turbidity in the sea water once every second. A light is passed through the water, and a sensor measures how much fluorescence (reflected light) the water has. The amount of chlorophyll is then calculated. The measurement was 6.97 µg/L when I observed the instrument. The amount of phytoplankton in the water can be interpreted from the amount of chlorophyll. Another sensor measures how much light passes through the water, which gives an indication of turbidity. Twice a day, a sample of water is filtered, and the chlorophyll is removed. The filter with the chlorophyll is preserved and sent to one of the NOAA labs on land for examination.

Here are all of the water quality instruments, they are mounted to the wall in the chem lab. Each one has a separate line of sea water.

The next instrument that the water passes through will measure the amount of dissolved oxygen every 20 seconds. Oxygen is important, because aquatic organisms take in oxygen for cellular respiration. From plankton to white sharks, the method of underwater “breathing” varies, but the result is the same – oxygen into the body. The oxygen in the water is produced by aquatic plants and phytoplankton as they do photosynthesis, and the amount directly affects how much aquatic life can be supported.

The TSG will measure temperature, and conductivity (how much electricity passes through) every second, and from these 2 measurements, salinity (how much salt is in the water) can be calculated. The day that I observed the TSG temperature was 8.0° C, and the salinity was 31.85 psu (practical salinity units). Average sea water salinity is 35. The intense study of melting sea ice and glaciers involves sea water temperature measurements all over the world. A global data set can be accumulated and examined in order to understand changing temperature patterns.

instrument to measure — This instrument measures the amount of nitrate in the sea water. It is called the ISUS.

The last instrument measures nitrate concentration in the sea water every couple of minutes. It is called ISUS, which stands for In Situ Ultraviolet Spectrophotometer. Nitrate comes from organic waste material, and tends to be low at the surface, since the wastes normally sink to the bottom. The normal value is .05 mg/L, at the surface, at 8°C. Values within the range of 0.00 to 25 mg/L are acceptable, although anything above 5 is reason for concern.

All of the data from these instruments is fed into a ship’s computer, and displayed as a graph on a monitor. The Survey Technician monitors the data, and the instruments, to make sure everything is working properly.

New Species Seen today:

Whale (unknown, but probably grey or humpback)

Horned Puffin

Dall’s Porpoise

Krill

Chum Salmon

Eulachon

monitor shows current data — The current water quality data is shown on this computer screen beside the instruments.

Personal Log

Living on a ship is quite different from living at home. For one thing, every item on the ship is bolted, strapped, taped, or hooked to the bulkhead (wall), or deck (floor). Most hatches (doors) have a hook behind them to keep them open(this reminds me of when I put hooks behind my doors at home to keep little children from slamming them and crushing fingers). Some hatches (around ladderways (stairwells)) are magnetically controlled, and stay open most of the time. They close automatically when there is a fire or abandon ship situation or drill. Every drawer and cabinet door clicks shut and requires moving a latch or lever to open it. For some cabinet doors that you want to stay open while you are working in the cabinet, there is a hook from the bulkhead to keep it open.

bracket holds copier — The copier machine is held in place by a 4 post bracket that is bolted to the floor.

On every desk is a cup holder, wider on the bottom than the top, designed to hold a regular glass or a cup of coffee. If one of those is not handy, a roll of duct tape works well for a regular glass. All shelves and counters have a lip on the front, and book shelves have an extra bar to hold the books in. Trash cans and boxes are lashed to the bulkhead with an adjustable strap, and even the new copier machine has a special brace that is bolted to the deck to hold it in one place (I heard that the old copier fell over one time when there was a particularly huge wave). There are lots of great pictures on the bulkheads of the Oscar Dyson, and each one is fastened to the bulkhead with at least 4 screws, or velcro. There are hand rails everywhere – on the bulkhead in the passageway (hallway) (reminds me of Mom’s nursing home), and on the consoles of the bridge.

hallway hand rails — This view down the hall shows the hand rail. It comes in handy during rough weather.

Desk chairs can be secured by a bungee cord, and the chairs in the mess (dining room) can be hooked to the deck.

Another thing that is different from home is the fact that the Oscar Dyson operates 24-7 (well, in my home, there could easily be someone awake any hour of the night, but the only thing they might operate is the TV). The lights in the passageways and mess are always on. The acoustics and water quality equipment are always collecting data. Different people work different shifts, so during any one hour, there is usually someone asleep. Most staterooms have 2 people, and they will probably be on opposite shifts. One might work 4 am to 4 pm, and the other would work 4 pm to 4 am. That way, only one person is in the room at a time (there is not really room for more than one). There is always someone on the bridge – at least the Officer of the Deck (OOD) – to monitor and steer the ship. During the day, there is usually a look out as well.

binoculars on the bridge — These binoculars are used by the look out to scan the surrounding area for anything in the water - whales, boats, islands, kelp, or anything else in proximity to the ship.

His job is to, well, look out – look for floating items in the water, whales, rocks, and other ships (called contacts or targets). This helps the OOD, because he or she can’t always keep their eyes on the horizon.

I have thoroughly enjoyed living on the Oscar Dyson (we have had calm seas so far), and talking with the NOAA staff and crew. They are ordinary people, who have chosen an extraordinary life – aboard a ship. It has challenges, but also great rewards – seeing the land from a different perspective, being up close to sea life, and forging close relationships with shipmates, as well as participating in the science that helps us understand the world’s oceans.

November 16, 2009April 6, 2021

Chris Imhof, November 16, 2009

NOAA Teacher at Sea
Chris Imhof
Onboard NOAA Ship Pisces
November 7 – 19, 2009

Mission: Coral Survey
Geographic Region: Southeast U.S.
Date: November 16, 2009

Science Log

We arrived late last night back in Jacksonville, Florida docking at the Atlantic Marine Docks – taking on 8 scientists who will leading the ROV operations – over the next few days. The next morning was a flurry of activity as the science crew began to unload their equipment and the crew of the Pisces operated the cranes and prepared the the sides of the ship and the winches for deployment of the ROV.

While Jeannine stayed aboard to help running cables and rigging the GPS equipment needed for pinpointing the position of the ROV relative to the ship – I chose to join the scouting party inland; myself, Lieutenant Dunsford, Engineer Tony Assouad and Lead Scientist Andy David made contact with local at the village of “Walmart” and acquired much needed supplies.

Gear was stowed and the equipment set up, the science party met for their safety briefing, followed by a larger conversation of what we will be accomplishing over the next couple of days. We plan to take the “Deep Ocean ROV” to at 3 sites – testing in and outside the MPA or “Marine Protected Area” about sites a day. We will be running mostly day time operations and transitioning to next station at night as well as doing some multibeam mapping – using the same type of technology I mentioned in yesterday’s blog. When the Pisces arrives in an area it will begin to “mow the lawn” – doing transects back and forth to create a map of the ocean floor below so the scientists can better choose targets or areas to avoid during the daytime ROV operation. For the most part we are assisting the scientists with the launching and retrieval of the ROV as well as monitoring what the ROV sees from a TV in the Dry Lab on the Pisces.

Like a lot of science the ROV will be recording a ton of data which will be more carefully evaluated over the next few months after the voyage. Many of the places we document in and out of the MPA will be explored again to see changes – so in a way this study sets a baseline for future missions. I am excited to see how they launch the ROV, which will give me some ideas for when my Innovation Technology Seminar launches their little rovers in a few weeks. The operator/pilot of the rover will be inside the dry lab talking through a headset to another rover scientist outside monitoring the 900 feet of cable – talking to a deck crew member operating a winch. We are hoping not only for calm waters on the surface for deployment-but quiet currents below so ROV has the opportunity to explore, rather than ride the current.

A few porpoises rolled along side the ship enough to enjoy, but too quick to get a good picture. Only the gray pelicans on the dock would stand still to pose. Before we pulled out of Jacksonville we climbed to the top of the Flying Deck to watch the Space Shuttle Atlantis launch in the distance. Even though we didn’t do much today it was still a pretty great day. 🙂