Bering Sea – Page 15 – NOAA Teacher at Sea Blog

July 29, 2010March 12, 2021

Story Miller, July 29, 2010

NOAA Teacher at Sea: Story Miller
NOAA Ship: Oscar Dyson

Mission: Summer Pollock III

Geographical Area: Bering Sea

Date: July 29, 2010

Time: 1922 ADT

Latitude: 59°47N

Longitude:178°14W

Wind: 5 knots (approx. 5.8 mph or 9.3 km/h)

Direction: 9.8° (N)

Sea Temperature: 10.1°C (approx. 50.2°F)

Air Temperature: 8.7°C (approx. 47.7°F)

Barometric Pressure (mb): 1015

Wave Height: 0 – 1 feet

Swell Height: 1 – 2 feet

Scientific Log:

I decided that it would be beneficial to provide some information regarding some of the animals I have seen over the past week.

Short-tailed Albatross (Phoebastria albatrus)

Yesterday morning during breakfast, one of the NOAA Corps Ensigns came down to tell me that there was a Short-tailed Albatross off the port side (left side) of the boat. This was a very special event, especially if you are an avid birder because currently there are about 2000-2500 in the world. The short-tailed albatross is one of three species of albatross living in the North Pacific Ocean and is the largest of all seabirds in this location. This bird has a wingspan of approximately two meters. One could conclude that the bird I saw was younger because young short-tailed albatross have “chocolate brown” feathers when young and as they grow larger they turn white. This bird likes to eat squid, small fishes like pollock, and zooplankton. The albatross population dwindled because the birds were very easy to access due to them only nesting on a couple islands in Japan and they were not afraid of humans. As a result they were really easy to kill and because there was a high market value for their feathers, hunters pursued them to near extinction. In fact it is said that in 1953 there were only about 10 pairs left in the world.

Northern Fulmar (Fulmarus glacialis)

This species of bird has been consistently following our ship since we left Dutch Harbor. They are primarily a pelagic bird which means that unless they are breeding, they are living out at sea throughout the year. The Northern Fulmar can be found in a range of different colors depending on where they were born. Generally, the darker birds are found in the southern parts of Alaska and the white are found farther north. However, if you are on the Atlantic side of the US the pattern is just the opposite with the darker birds originating in the high Arctic and the light are found farther south! These birds typically feed on squid and small fish. One fact that I find fascinating about the Northern Fulmars is that they have the ability to launch their puke up to 6 feet as a defense mechanism! I shall now remember it as the projectile vomiting bird!

Black-legged Kittiwake (Rissa tridactyla)

One interesting fact about this bird is that it has only three functional toes, hence the tri prefix in its scientific name. These birds are white and their wings are gray. Because I grew up in the desert, my untrained eye mistakenly identified them as a seagull but thanks to USFWS scientists Marty Reedy and Liz Labunski, I am now informed of the differences! This bird is also pelagic and their breeding season is during this time. These birds feed on small fish and they are found around the coasts of Alaska, the Bering Sea, and in the northern Canadian Atlantic Coast. When the black-legged Kittiwake feeds, it usually catches its prey on the surface of the ocean but it has been known to plunge underwater. Typically they feed on zoopankton.

Red-legged Kittiwake (Rissa brevirostris)

As stated in its name this bird has bright coral red legs and is typically shorter than the Black-legged Kittiwake. These birds are most commonly found mostly in the Pribilof Islands and there are only about five or six places in the world where they breed, all of which are in the Bering Sea.

Short-tailed Shearwater (Puffinus tenuirostris)

These birds are known to breed off Australia. In the summer they migrate to Alaska, a trip of about 9000, and have been known to take as little as six weeks! In Australia they are important in the Aboriginal culture in Tasmania and are commercially harvested for food, feathers, and oil. These birds usually eat crustaceans but are also known to eat fish and squid. To catch their prey, they will plunge or dive into the water. One interesting adaptation is that they are able to convert their food to oil and the benefit is that oil does not have as much weight as an ingested animal which allows the birds to travel long distances.

Fork-tailed Storm-Petrel (Oceanodroma furcata)

When I first saw these birds I thought a bat was flying over the water due to a slightly more erratic flight pattern than the smooth flights of the other birds I have observed. These birds typically feed at the surface of the water. Fork-tailed Storm-Petrels are also pelagic, living approximately 8 months at sea and when they do return to their breeding grounds in late-spring, they will dig burrows in the soil or find ideal nest locations in rock crevices. The baby chicks are thought to have a unique adaptation for survival. Sometimes the parents leave the baby alone for many days to look for food. During this time the baby’s body head drops into a state of torpor until the parents return and raises its body temperature.

Pomarine Jaeger (Stercorarius pomarinus)

These birds are capable of backward somersaults in the air and take part in acts of piracy as they have been known to harass other birds until the lesser bird gives up its food. The Pomarin Jaegers primarily feed on lemmings and even have a reproductive period that is dependent on the brown lemming! According to the USFWS they are “the only avian predator that digs for lemmings.”

Smooth Lumpsucker (Aptocyclus ventricosus)

Lumpsuckers live in cold waters in the Northern Hemisphere. They have a disk underneath their body that allows them to cling to rocks. “All but a few lumpsuckers have spiny tubercles on the head and body” (2002). There are 27 species of lumpsuckers and 10 are confirmed to occur in Alaska with 3 more species are known to be near Alaska. These fish can be found on the bottom of the sea, usually on the continental shelf.

Personal Log:

The suction disk of the Smooth Lumpsucker

After my shift ended yesterday, I hung out on the bridge and looked at seabirds and tried to find evidence of land (Russia) since we are so close. The day was clear and sure enough, right after supper, Russia was spotted! While I have not been out to sea that long, the idea of land coming into view was an exciting feeling. Perhaps the feeling was because the land belonged to Russia and I had never been there before or that the sighting of land broke up the monotony of the never-ending stretch of moving water. I feel that the feeling was derived from a little bit of both. While I was searching for Russia, I had the opportunity to observe a Fin Whale about one mile (~1.5km) ahead of the boat. A few times, it came out of the water enough so that you could see its total back and dorsal fin! For me, Fin Whales have been the most commonly spotted.

This morning, after repeatedly launching the experimental Cam-Trawl with no results, we finally snagged a picture of a fish early this morning! The picture was very dark and the fish, mostly a blur but it was obvious that the image was a fish! This is yet another example of how a scientist must be patient as it is common in real-life experiments, as opposed to structured labs in the classroom, to have tests fail multiple times before useful results occur!

The first fish photographed by the Cam-Trawl!

In the evening, I decided to spend time on the bridge again and watch for whales. I was in luck yet again as I was able to see two Humpback whales! They were swimming very close to the ship, but not close enough for the zoom on my camera! I was able to watch them for a good twenty minutes before they “fluked” (showed their tail) and dove deep underwater!

Overall it was a very interesting couple of days!

Citations:

Denlinger, L.M. 2006. Alaska Seabird Information Series. Unpubl. Rept., U.S. Fish and Wildl. Serv., Migr. Bird Manage., Nongame Program, Anchorage, AK

Mecklenburg, C.W., Mecklenburg, T.A., & Thorsteinson, L.K. (2002). Fishes of alaska. Bethesda, MD: American Fisheries Society.

USFWS scientists Liz Labunski and Marty Reedy

Animals Viewed:

Walleye Pollock

Pacific Herring

Smooth Lumpsucker

Shrimp (unidentified) but they looked like what I have for dinner!

Jellyfish

Fin Whale

Humpback Whale

Short-tailed Albatross

Northern Fulmar

Something to Consider:

Many people, including myself, enjoy watching animals but never learn what their common names are! We take for granted the wonders of Mother Nature that we see everyday and sometimes disregard them as being “normal.” However, what you see may not be normal for other people, such as seeing high populations of bald eagles in Dutch Harbor and Unalaska! It is never too late to learn and if, for example, you move to a different location with different flora and fauna, you can share with your new friends the environment from which you came! I find when traveling to other countries or other locations in the “Lower 48” that they assume Alaska is always cold, snowy, and that penguins live there (which they don’t)! When I take my pictures with me, it is exciting to see other people’s reactions and the conversations afterward are always engaging!

Now would be a great time to photograph the animals and plants you see inhabiting the land surrounding your home. You never know when you may bump into an avid “birder” or other animal specialist that could tell you their names. Or, if you are feeling particularly enthusiastic on a foul weather day, there are many identification books available in your local library.

July 27, 2010March 30, 2021

Story Miller, July 27, 2010

NOAA Teacher at Sea: Story Miller
NOAA Ship: Oscar Dyson

Mission: Summer Pollock III

Geographical Area: Bering Sea

Date: July 27, 2010

Time: 1940 ADT
Latitude: 60°28N
Longitude:177°51W
Wind: 8 knots (approx. 9.2 mph or 14.8 km/h)
Direction: 270° (W)
Sea Temperature: 9.2°C (approx. 48.6°F)
Air Temperature: 9.1°C (approx. 48.4°F)
Barometric Pressure (mb): 1007
Swell Height: 1 foot (about 30.5 cm)
Wave Height: 0-1 foot (about 30.5 cm)

Scientific Log:

Chief Scientist Taina Honkalehto holds a pollock

There are many different groups of people working aboard the ship, Oscar Dyson – Scientists, NOAA Corps officers, Deck Hands, Engineers, Survey Technicians, and Cooks. Within the science department, there are 12 members aboard and two Teachers at Sea which totals to 14 souls. For this third leg of pollock surveys, the chief scientist is Taina Honkalehto. Her job aboard the ship is to plan the scientific activities and make the decisions on how best to carry out that plan. Of the scientist crew, there are two Russian scientists that are conducting their own research in collaboration with NOAA.

This pollock survey, which focuses on determining abundance and distribution, is an important component of the fishing industry in the United States. According to The Bering Sea Project, “The largest concentrations of pollock occur in the eastern Bering Sea,” and more specifically, “Walleye pollock support the largest single commercial fishery in the U.S., producing the largest catch of any one species inhabiting the 200-mile US Exclusive Economic Zone.” Additionally, the pollock industry is incredibly important to the people living in Dutch Harbor and Unalaska because pollock is one of the main fishes processed there and has helped classify Dutch Harbor as America’s #1 fishing port in the USA for fish landed (NOAA, 2009).

View of a spread out group of pollock as seen from
the computer screen. Notice in the far right corner a
red spot. That shows that at that location,
the fish are densely packed. The red, yellow,
and green-blue line represent the seafloor.

There are two summer surveys being conducted to estimate the Bering Sea pollock population: Acoustic-Trawl Survey and the Bottom-Trawl Survey. Currently on the Oscar Dyson we are conducting the Acoustic -Trawl Survey. After we catch the fish, we combine the acoustics, fish samples, and CTD deployment data, to draw conclusions that help us estimate population size and ecological factors of pollock. Remember, in order for pollock to live where they do, they need food and so when we extract stomach samples, we are looking for what pollock prey upon (mostly krill). Besides, food, other important aspects of their habitat must be in place for their survival. The CTD data – water temperature, salinity, nutrients, oxygen, and chlorophyll – help us understand how the distribution of pollock has changed in past years and may also provide information about how it could change in the future.

However, not all of the scientists on board are collecting data related to pollock. Currently we have two other subgroups with one observing seabirds and the other observing marine mammals. The crew observing seabirds have a goal of observing species seen during the tour to determine seabird species distribution and abundance. The marine mammal observers are working to obtain current data on cetacean species distribution and abundance.

The Teachers At Sea (TAS), which currently include Obed Fulcar (New York, New York) and myself (Dutch Harbor, AK) have an important role of working under the scientists and other crew members to learn about the research being conducted in an attempt to bring real science into the classrooms.

A large group of fish scattered about from the perspective of the transducer.

Because acoustics is a major tool used in pollock survey, I feel it would be beneficial to provide a few details on how it works. Remember, referring to Blog #2 “the ship has Transducers that send pings of sound energy down through the ocean and when they hit some object, such as the bottom of the ocean or a fish, in this case they are hitting the swim bladders of the fish, some of the energy in the sound ping is returned to the ship and received by our echo sounding system in the acoustics lab of the ship.” It is important to note that the acoustics under the water are different than in the air because the pressure in each location is different. Inside the acoustics lab there are many different screens that display the pings at different frequencies of sound waves. We know that jellyfish tend to show up the best from the low frequencies. Acoustics is a good tool to use to study pollock because pollock is the primary fish species inhabiting the middle-waters of the Bering Sea shelf. For example, bottom fish are difficult to see because the acoustic signals from the seafloor are too strong and tend to hide the bottom fish signals. Acoustic signals that we see on the computer screen rely on the actual physiological make-up of the fish. Also, the behavior of pollock plays a role in how we can see them acoustically. For example, salmon do not swim in large schools like pollock. When we see large schools of pollock on the acoustic screens, density determines the color – blue usually is reflecting a couple fish whereas red represents a high density of fish – and the shape of the schools tend to be typical of pollock. Through acoustics, we are able to survey pollock over a wide area and gain information regarding their distribution and population.

Prior to fishing, we consistently monitor the screens as the ship travels up and down the rectangular transects you can see when you view the ship’s path on ShipTracker. When we observe schools of fish, we need to decide whether they are large enough to sample the fish with the trawl. Because we also want to target certain ages of fish, it is important to be able to estimate their size.

We can estimate size through a method using additional measurements from the acoustic data. We draw a box around an area that is not densely packed with pollock so it is easier to distinguish an individual acoustic image of a fish. The software we have gives us the average intensity of the acoustic pixels. We call this intensity target strength which translates to the size of the echo. Because the size of the swim bladder is proportional to the size of the fish, we can use the intensity of the echo off the swim bladder to estimate the size of the pollock. In short, target strength depends on the size of the swim bladder and features of the swim bladder can be used to predict fish size.

Acoustic image from the bridge. The bottom blue streak is a large group of fish that ducked under the net. The horseshoe shape is the net. The blue inside the horseshoe are the fish.

We can use an equation for calculating decibels to help us estimate the size of the fish in the school we might target. For my friends and students who are math gurus, the equation is TS = 20Log(length cm) + b20. The b20 variable is different for different fish species and so for Walleye Pollock in the Bering Sea, b20 is -66. Therefore, the equation for Walleye Pollock is TSpollock = 20Log(length cm) – 66.

To provide an example of how the equation works, lets say that the average length of a two year-old pollock is 25 cm and that is the size we want to target. We take that 25 centimeters and “plug it” into the section of the equation that stands for length in centimeters. Scientific calculators are wonderful devices for logarithms as they have the Log function already installed, and if you plug in 20Log(25) – 66 into the calculator, the answer -38.4 translates into the target strength that would show up on the screen. So if we find schools of pollock and see that the target strength is close to -38.4, then we know the echosounder is observing two-year old pollock.

Once acoustics have determined that we need to fish, they send the coordinates they want the Officer of the Deck (OOD, a.k.a. the NOAA Corps officer on watch on the bridge) to follow and the officers drive the ship to the location. On the bridge of the ship, the scientists are able to see the acoustic screens and are able to keep an eye on the location of the fish, relative to the transducer underneath. From there the Lead Fisherman or Chief Bosun operates the machinery required to put the trawls in the ocean. After the large mesh net is placed in the ocean, the crew put on a sensor that measures water depth and temperature. They also install a tool, called a headrope unit, that is similar to a mini transducer which makes an image of the mouth of the net and allows the scientists to watch fish entering the net from the bridge.

Senior Survey Technician, Kathy Hough, and Ordinary Seaman, Frank Footman, installing the head-rope unit.

Once the fish are caught, the deck crew will draw the nets back onto the boat using hydraulics. From the stern (back of the boat), the fish go into the fish lab on a conveyer belt where we sort, sex, measure, and extract stomachs and otoliths. Since being on the ship, during my shift we have been averaging two trawls per day.

How is the information we collect used?

On the ship, we are collecting raw data, entering into our computers, and analyzing what we see. From there, we can draw conclusions based on what we have observed from our samples. However, there are other scientists at work here. For example, perhaps you are interested in working with computers and want to be involved with wildlife. Some of the scientists help design the computer programs we use and maintain them. Perhaps boat life is not your “cup of tea.” All the stomach and otolith samples we collect need to be sent into a lab to be analyzed by a stomach or otolith expert. The data they compile from the samples we collect get added into our publication at the end of the survey. There are also scientists that compile our conclusions about what we saw on the ocean and they create models to show population trends and predict future abundance. From that information, a council of scientists, industry representatives, and others of interest, get together and determine things such as fishing quotas. Also, don’t forget that there are teachers, like me, aboard who take some of the scientific information or scientific processes and educate students about real science in the real world.

If you want to obtain a job working in the sciences department of NOAA, some courses of study that will increase your chances of becoming involved include but are not restricted to: Marine Biology, Chemistry, multiple levels of mathematics, Computer Science, Writing. Versatility is another key factor to consider for any job you may want to pursue as the more background information you have, the more information you can “bring to the table.” For example, perhaps you love music. An understanding of decibels and how sound is carried at different frequencies is incredibly useful in acoustical sciences. Foreign Language is always beneficial as you will continually work with people from all over the world and remember, there are two scientists currently on the ship who are from Russia! Therefore, in my opinion, don’t forget about your electives when choosing your courses because the more rounded you are, the greater your chances are for success!

Personal Log:

My morning started off fantastic as I was able to launch an XBT into the water again. By the time I was beginning to type this blog we passed over a school of pollock and decided that we needed to turn around and go fishing. Approximately two hours of sorting commenced before I was able to return. I learned that acoustics is a very difficult concept to explain as there are many factors in mathematics and physics that are complicated to translate into layman’s terms. I ended up spending a lot of time reading a textbook on the research the theories of using acoustics on wild fish. Please do not hesitate to ask in the comment box below this post if you have questions!!!

Overall, there was a good assortment of fish today and I stayed fairly busy in the fish lab collecting pollock sample data!

Me giving the fish a layer of water so that they slide down the
chute and onto the conveyor belt easier.

Animals Seen Today:
Walleye Pollock
Silver Salmon
Northern Fulmar
Parakeet Auklet
Short-tailed Shearwater
Least Auklets
Tufted Puffin
Thick-billed Murre
Northern Fur Seal

Something to Ponder:
Life at sea can be an amazing experience but there are many things people may take for granted when living on land. For example, consider the possibility of becoming hurt on the job, or developing a medical condition such as a rash or appendicitis. From the middle of the ocean, it is very difficult to reach a doctor to get a diagnosis. On board the ship, we have some medical supplies but typically there is not a licensed doctor on board the ship. Would you know how to respond to an emergency if it were to happen? If you have taken a First Aid or CPR class, do you remember what you need to do? How would you react? What would you do to reach help? Who could respond to your call?
For the Oscar Dyson we have the following protocols:
1. Contact the medical officer on board for an initial diagnosis.
2. If the condition requires advanced medical care, he or she will contact the medical officer on call at the NOAA Marine Operations Center.
3. In the case of an emergency and when the Marine Center cannot be contacted, he or she will contact the Maritime Medical Assistance (MMA).
4. If needed, we will arrange for a medevac (medical evacuation) which could involve the US Coast Guard and/or head back to port.

July 27, 2010April 22, 2021

Obed Fulcar, July 27, 2010

NOAA Teacher at Sea Obed Fulcar
NOAA Ship Oscar Dyson
July 27, 2010 – August 8, 2010

Mission:Summer Pollock survey III
Geograpical Area:Bering Sea, Alaska
Date: July 27,2010

Weather from the Bridge:

Time:05:26 am
Latitude:59.27 N
Longitude:176.58 W
Wind Speed:11.8 knots
Wind Direction:219 degrees W
Sea Temperature:9.4 C (48.92 F)
Air Temperature:8.27 C (46.88 F)
Barometric Pressure:1008 mb
Foggy skies

SCIENCE & TECHNOLOGY LOG:

Thursday, July 22 (continuation): After my bout with motion sickness, I felt a lot better so I decided to finish my shift. Around 1400 (2pm) upon returning to the Acoustic lab suddenly I smelled the fish:they were trawling for Pollock! I rushed to the wet lab to find Darin and Story, my fellow Teacher at Sea, and a young scientist named Kathy Hough already in full gear, surveying the Pollock. The catch was coming down a chute and spilling over a conveyor where the fish was sorted out by sizes.

The targeted size Pollock was placed in crates to record the weight on a digital scale, while the rest, together with any giant jelly fish, or Northern Sea Nettle (Chrysaora melanaster) caught in the net were return overboard.

The next part of the survey involved dissecting each fish using a scalpel, making a cut across the left side of the underbelly in order to determine the sex and the content of the stomach. There was a large chart showing pictures of the way the female reproductive organs or ovaries and the male testes looked like at each level or size from 1 to 4.

The males were named “blokes” and the females“sheilas” (I believe these to be Australian terms). After the dissection the length of each fish was recorded automatically using a whitemeasuring board with a yellow metric ruler featuring a magnetic strip.

The final step involved selected specimens getting a cut above their heads in order to remove two tiny ear bones or “Otolith” that every bone fish have. They are used to determine the growth of the fish, and together with samples of stomach content they were preserved and placed in a freezer to be sent to a NOAA laboratory in Seattle for further analysis.

PERSONAL LOG:
Working with the Pollock Survey has really hit home. All this fish made me think about “Sharky”our Brook Trout resident born 3 years ago in our cold water aquarium at MS319, as part of“Trout in the Classroom” a program where New York city students learn about conservation by raising trout from eggs to fingerlings, or juvenile size, and then they get to release them in a cold water stream upstate New York.

Trout is another fish that is part of the Alaska ecosystem, living and spawning in streams along the coast. The trawling reminded me of when we cast ourSeine nets on the Harlem River, as part of our Environmental Education after school program, in order to identify the fish and collect the data, just like the survey. I made a great connection when Darin, the young scientist working with us on the Pollock survey, told me that Pollock is called “Bacallao” in Portuguese. This reminded me that back in New York City, I noticed that for the past years in every “bodega” (spanish grocery store) the packaging containing Bacalao nowadays say Pollockinstead of what traditionally used to be Cod fish. Apparently there is an specie of Atlantic Pollock that has been historically consumed in Europe and in the Mediterranean countries of Portugal and Spain, so it is no surprise that we have incorporated Bacalao as part of the traditionalcooking of the Dominican Republic. Every self-respecting Dominican knows that Bacalao is a staple of Dominican cuisine.

I never liked fish as a child, and I remember that Bacalao was the only fish I actually enjoyed eating until this day, well seasoned in tomato sauce and onions, accompanied with rice beans or with yucca. This reminds me of another fish part of the dominican culinary culture: a form of dried, smoked fish (very smelly) known as“Arenque”. This fish, widely sold in bodegas and open markets is usually cooked in a paella style rice called “locrio”.

I had a hunch that Arenque was Spanish for Herring, another fish like Pollock, found in the waters of the Bering Sea. After a little research I found out that indeed Arenque and Herring were the same. Arenque is the Spanish word for the Atlantic Herring (Clupea harengus), commonly fished and consumed in Spain, Portugal, and South America. Humm…Arenque=harengus (Latin),whence the English nameHerring. Eureka! Days later some Pacific Herring was caught in one of the trawls and I noticed it had large shiny scales, dark blue on the top, and silver ones in the underbelly. Some where cooked for diner that night and the meat was very tasty, looking like… Arenque.

Animal Species Observed:
Northern Sea nettle jellyfish, Pacific Herring (Clupea pallasi),Walleye Pollock (Theragra Chacogramma)

New Vocabulary:
Arenque, Bacallao, Bodega, Brook Trout (salvelinus fontanelis),Herring, Otolith, Seine Net, Scalpel

“Monitoreo del Bacallao”

El mareo no me permitio participar en la pesca de hoy, pero desde que me senti mejor fui directo a la cubierta donde una grua de carga habia depositado los peces en una rampa de aluminio hacia el Laboratorio Humedo. Ya adentro encontre a Story, mi colega maestra, Darin, y una joven cientifico llamada Kathy, que ya estaban trabajando con los pescados. El proceso consistia en separar el Pollock de otras especies como el Herring, y la Medusa Gigante, que despues de tomarse el peso eran arrojados por la borda. El Pollock era pues separado por sexo, entre “Blokes” machos, y “Sheilas”, hembras (terminos australianos), y esto se hacia por medio de diseccion, donde tambien se analizaba el contenido del estomago, usando un poster con fotos de los organos internos del Pollock a diferentes edades como guia.

Luego de la diseccion procedimos a medir cada uno de los pescados, Story los machos, y yo las hembras, usando una tabla blanca con una cinta metrica amarilla, que contenia una cinta magnetica. Cada pescado era medido automaticamente al colocarse cuidadosamente a lo largo de la cinta metrica, y el conteo era registrado en una pantalla de computador con el nombre del cientifico. Me senti muy orgulloso al ver mi nombre como el cientifico de turno! El paso final era el de remover el “Otolith” o hueso del oido, usado para medir el crecimiento del pez, que junto a el contenido del estomago se preservaba para enviarse a los laboartorios de NOAA en Seattle. Tanto pescado me hizo pensar en “Sharky” la trucha mascota que hemos estado criando en el aquario de la escuela como parte del programa “Truchas en El Salon de Clases”. Tambien me recorde de cuando mis estudiantes tiran las redes de pesca para estudiar las especies acuaticas del Rio Harlem, como parte del programa de Educacion Ambiental que dirijo en la escuela MS319. Tambien estudiando el Pollock, aprendi que los portugueses le llaman“Bacallao”, casi identico a la palabra “Bacalao”, que es como lo llamamos en Republica Dominicana. Otro pez que junto al Bacalao son parte de la cocina tradicional dominicana es el Arenque. Yo tenia una corazonada que el Arenque era la misma palabra de un pez que en Ingles se llama “Herring”, tambien muy abundante en Alaska. Despues de hacer una investigacion, Eureka! resolvi el misterio. Arenque es la palabra usada para referirse al Clupea harengus o Arenque Atlantico, de donde viene tambien el termino Herring=harengus=Arenque. Todo Dominicano que se respeta sabe que el Bacalao y el Arenque son parte de la comida tradicional dominicana.

July 24, 2010March 12, 2021

Story Miller, July 23, 2010

NOAA Teacher at Sea: Story Miller
NOAA Ship: Oscar Dyson

Mission: Summer Pollock III

Geographical Area: Bering Sea

Date: July 23, 2010

Time: 1240 AKST

Latitude: 60°30N

Longitude:176°29W

Wind: 8 knots (approx. 9.21 mph)

Direction: 156° (SE)

Sea Temperature: 8.9°C (approx. 48°F)

Air Temperature: 9.2°C (approx. 48.6°F)

Barometric Pressure (mb): 1008

Wave Height: 0.5 feet
Wave Swell: 5 – 6 feet

Scientific Log:

Survey Tech Robert Spina and Fisherman Mike Tortorella deploying the CTD

We started the morning by dropping a CTD (Conductivity, Temperature, Depth) and monitoring the salinity of the ocean, the temperature, and depth. Salinity, the amount of salt in the ocean, is important as the higher the salinity the more conductivity it possesses. Conductivity is necessary for many things such as scientific observation and for marine life. For example, the transducer we use to send pings of energy through the ocean relies on conductivity and sound tends to travel better through waters with a higher salinity. Sound traveling through water is also important for animal communication. Salinity can influence the presence of fish species due to the different ways they process the water (think about freshwater fish versus saltwater fish). Water temperature is important for observing climate change. Because salinity affects the density of water (My students: remember the lab where we floated the egg with salt), it can change the temperature at which the ocean freezes. A simple example is that plain distilled water freezes at 0°C but the ocean at the surface typically begins to freeze at -1.1°C. As the water depth increases, so does the salinity and therefore as the temperature decreases the ocean does not freeze. We also launched an expendable bathythermograph (XBT) which measures depth and temperature at a deeper level than the CTD. These two tests are used to characterize the Bering Sea shelf environment.

Approximately six hours later we spotted our first school of pollock. We shot the AWT and caught a lot of two year-old pollock and a few one year-olds! The water temperature where they were located was about 2.5°C. I quickly donned my foul-weather gear and ExtraTuffs (rubber boots) and was ready to sort fish. From one sample, we sorted the fish, separating the small one year-olds from the two year-olds. Second, we cut open the fish to locate ovaries or testes. The males and the females were separated into bins and we fondly refer to the males as “Blokes” and the females as “Sheilas.” We measured their length and entered the data into the computer. With another sample, we sexed the fish, measured their length, extracted stomach samples to see what they are eating and to collect plankton samples, and last we extracted the otoliths. Otoliths are ear-bones and they are used to measure age, very much like looking at tree rings to find the age of a tree.

Me sorting the 1 year from the 2 year-olds

The walleye pollock observation has been conducted each summer since 1979 by the Midwater Assessment and Conservation Engineering (MACE) as a program of the Alaska Fisheries Science Center (AFSC) to estimate pollock abundance and distribution. The Oscar Dyson is following a route consisting of evenly spaced (20 nautical miles) parallel transects to estimate the pollock population over the entire Bering Sea shelf. So if you are tracking the ship using “Ship Tracker” this is why we are sailing in a strange pattern!

Personal Log:

Yesterday I was slightly anxious because I chose to experiment with my sea tolerance and not take the seasickness medication. Of course the seas decided to be a little more active as we began our pollock transit. Combined waves reached 10-12 feet and I just ate plain rice and bread for supper! Today the waves are more gentle and my stomach is very excited about that! Up on the “Bridge” where the controls for driving the boat are located tends to rock with the waves the most and it was fun to try and type my blog while attempting to keep my balance! However, by the end of the day, I was well enough to help “supervise” ENS Payne in the construction of chocolate chip cookies during my time off!

Dissecting the fish was incredibly fun and I cannot wait to have my students try their hands at it! I was very excited to extract otoliths because those particular bones were the fossils we used to identify the different fish species at the Always Welcome Inn in Baker City, Oregon when I was conducting research in college! To see those fossils go to the following website:

http://www.eou.edu/geology/index.html

Tomorrow we will be crossing the International Dateline and theoretically will have traveled into the tomorrow of tomorrow. The Oscar Dyson has become my time machine!

Image produced by the echo sounder telling us we have pollock! Notice how it looks different from the view in the previous blog.

Animals Viewed Today:
Least Auklet
Laysan Albatross
Fork-tailed Storm Petrels
Northern Fulmars
Short-tailed Shearwaters
Walleye Pollock

Something to Ponder:
Have you ever ordered pollock? How many of you have eaten fish sticks or surimi? Most likely you have eaten pollock and thought it was cod! Where does pollock fit in the food chain in the wild?
Also, how do you know when you have crossed the International Dateline? (Hint: check the data at the beginning of my blogs.)

July 24, 2010March 12, 2021

Story Miller, July 24, 2010

NOAA Teacher at Sea: Story Miller
NOAA Ship: Oscar Dyson

Mission: Summer Pollock III

Geographical Area: Bering Sea

Date: July 24, 2010

Time: 1837 ADT
Latitude: 62°11N
Longitude:177°52W
Wind: 15.1 knots (approx. 17.4 mph)
Direction: 156° (SW)
Sea Temperature: 8.3°C (approx. 47°F)
Air Temperature: 7.4°C (approx. 45.3°F)
Barometric Pressure (mb): 1007
Wave Swells: 4 – 5 feet
Wave Height: 1 – 2 feet
Combined: 5 – 6 feet

Scientific Log:
Today started out with the launching of another CTD (Conductivity, Temperature, Depth) and XBT to measure the salinity and temperature of the ocean. On average we typically deploy a little more than one per day, depending on whether we are wanting to hit key locations. Today when we launched two and contrasted locations where there were pollock to locations where there weren’t so we could better analyze how sea temperature affects where the pollock prefer to hang out.

Survey Tech, Robert Spina, taking samples from the CTD

We attempted to launch the Cam-Trawl this morning but as is typical with new equipment, we encountered some problems once it was in the water. And as my students have learned, sometimes it’s necessary to make modifications and try the science experiment again! Even the pro’s must go through the Scientific Method multiple times before they can publish their findings!

At approximately 1030 we deployed the AWT and went fishing for more pollock. This time we were able to gather a variety of different ages between the years 1-3. Once the fish are dumped from the codend, they are placed on a type of conveyor belt that allows us to do a preliminary sort through the fish. For example, jellyfish are commonly caught in the net and so we place them in a separate bucket to measure later. Sometimes we accidently catch other fish in the net, this is called bycatch, and they too need to be separated. At the end of the conveyor belt another person weighs baskets of fish and records the weights in the computer. Afterward, we take a random sample of about 400 fish and sex them. This sample is used to determine how many fish of each size are in the sample. Unfortunately we do not have a way to identify the sex of the fish without having to cut into them to see. In addition to measuring, weighing, and sexing the fish, we again took samples of pollock stomachs and otoliths. We conducted two fish hauls during my shift and we will probably do two more tonight.

When we finish collecting the data we must clean the lab. The best part of this cleanup is that the dissected fish become food for the numerous Northern Fulmars trailing our ship and then the lab is simply hosed down, including the computers! We clean the lab after every fishing event because if the fish scales dry out, they become impossible to remove, much like cereal crusted in a bowl! Not to mention all the fish parts would become unbearable stinky when we have a rare, sunny, warm day!

Pollock stomach contents: Amphipods (dark) and some type of fish.

Personal Log:
When I walked outside to observe the activity on the deck (where the fishing nets are located in the back of the ship) the fog was very thick. Of course, living in Dutch Harbor, I have become accustomed to such conditions but being out on the boat gave me an entirely new feeling. The boat rocked calmly, pitching every-so-often and overall there was an eerie silence among the crashing of the waves. The fog creeped aboard the boat drifting like fingers into every space available and subtly created a chill when it brushed against your neck. I can understand why sailors are prone to superstitious beliefs.

Northern Fulmars trailing the boat on the starboard side.

Later, the weather cleared into a gorgeous blue sky and the golden sun glistened on the water. I had an exciting day as I was allowed to launch an XBT and able to advance my skills in fish dissecting as I extracted stomachs and otoliths along with my regular fish duties of sorting, sexing, and measuring.
Today was a full day of work and when I when I walked into the mess hall for supper, I could not believe my eyes. There is nothing better than having a chef aboard a ship that cares for his crew. There was turkey, ham, bread dressing, mashed potatoes, cranberry sauce, candied yams, salmon tetrazzini, brown gravy, Tom Yumm Soup, dinner rolls, and corn bread! In addition, we had the lovely view of food art as our chef Ray Capati created a swan out of an apple, bouquets of baby bok choy and celery, “water lilies” made of grapefruit or oranges and mixed with flowers, and palm trees made of carrots and green bell peppers! I feel like I’m eating in a 5-star restaurant aboard the Oscar Dyson!

Ray Capati behind another fantastic, aesthetically pleasing buffet!

Animals Spotted Today:
Today is known by the “birders” from the US Fish and Wildlife folks as the Day of the Jaeger because we were able to see all three species: Longtail, Parasitic, and Pomarine!
Northern Fulmars
Black-legged Kittiwake
Common Murre
Thickbilled Murre

Least Auklet
Slaty-backed Gull (Russian seagull)
Jellyfish (Chrysaora Melanaster)
Walleye Pollock
Rock Sole
Silver Salmon (Coho)
Arrowtooth Flounder
Digested shrimps, euphausiids, amphipods, and copepods from pollock stomachs!

Something to Ponder:
Random samples are important in scientific observations because we want to obtain a general idea of what is in the ocean. Imagine if a scientist only selected the largest pollock caught in the codend. How would that skew the data samples and the information given to the public about the pollock in the ocean?