As we have moved farther west, we have encountered more fish and are therefore completing more trawls. Yesterday was our biggest day so far and we completed two trawls for pollock (referred to as AWTs for Aleutian Wing Trawl) and one Methot during our 12 hour shift (with more fishing done in the next shift). Our first trawl started at the beginning of our shift and we hustled to finish processing before breakfast. To help keep our spirits up, Abby, Michele, Katie, Robert and I rocked out to some 80s tunes as we sorted and processed fish. Imagine the five of us bopping around the lab, in our foul weather gear, with scalpels in hand, while Rick Springfield wishes he had Jessie’s Girl, all before sunrise.
Even though we completed three hauls, I still had time to work on my “Run Across Germany” (for Chuck Norris Snuggle Muffin) and to spend time with the mammal observers. As I mentioned before, marine mammal observers have to be extremely patient. I spent about an hour and a half with them yesterday evening and saw two groups of whales through the big eyes (which was more than average). One was clearly a group of 2-3 fin whales while another was an unidentified blow.
Checking out the big eyes
The marine mammal observers mark all sightings in a data program with a mapping function that then predicts where the cetaceans might be moving so the observers can identify whether future sightings are the same or new animals. They might see two or three sets of blows before they spot any part of the body which could help them identify it. Fin whales come up to the surface once every 8-10 minutes and it took until the third set of blows before marine mammal observer Paula Olson was able to identify them (I got to see them on the fourth surface visit).
While we were waiting for the fin whales to come up again, Paula explained that in our part of the Bering Sea, there are five cetacean species that we are most likely to see. We determined that with the fin whale sighting I have already seen three (killer whales, Dall’s porpoises, and fin whales) leaving me with two species to scope out before we leave (minke whales and humpback whales (you know, like Humphrey)). Hopefully the weather will stay clear and I’ll be able to spend some more time on the flying bridge.
Animals Seen • Squid • Fin Whales • Pteropods • Ctenophores • Amphipods • Euphausiids • Pollock
Word of the day descry: to catch sight of something in the distance
After my shift ends at 1600, I usually hit up one of the gyms. That’s right, I said gyms – plural. There is a forward gym that contains a treadmill, an exercise bike and an elliptical and an aft gym, located in the winch room, which contains a treadmill, an ERG machine, a spin bike and free weights. Abby, Katie, Michele and I usually hit up the gym at about the same time and have a great time comparing our ability to not do ring push-ups while we rock out to music.Workout time is a way for us to zone out for a while even though we have to stay focused on our movements when the swells are high (see weather entry for more information). I’ve tried using the treadmill a couple times and feel like I’m getting twice the workout because I have to use my core and arms to keep me steady.Since the gym is a popular place for many residents of the Oscar Dyson, Ensign Amber Payne spearheaded a “European Challenge of the Century.” While we travel our transects on the Bering Sea, officers, crew and scientists are tasked to climb the Matterhorn (lower body workout), bike the Tour de France (exercise or spin bike), swim the English Channel (there is a pool in Dutch Harbor), hang-glide across Ireland (ab workouts), and more. We were assigned teams randomly and have the opportunity to contribute while we are at sea. My team, Chuck Norris Snuggle Muffin, has taken an early lead but other teams are getting into the spirit and the gyms have been more crowded recently. The competition will last until the end of the field season (early October) but I am excited to contribute while I can.
Chuck Norris
In addition to the gyms, people who are off duty congregate in the computer rooms or the lounge. Everyone on the ship has some quantity of work to do on the computer and email/messenger is the most reliable method of communication to family and friends off the boat (even though the Internet is less than reliable as we go farther north). We are lucky to have comfortable couches, a big screen TV and a collection of hundreds of movies, including several recent movies. Recently, a large group of us day shifters watched the classic Enter the Dragon and periodically imitate Bruce Lee as we launch XBTs and process pollock.
While on the subject of leisure activities, I should mention that I have taken an obscene number of photographs while I have been here and get entranced just looking out the window or watching the path of the short-tailed albatross. Here is a photo I took this morning after our first trawl of the morning (Fulmars are always circling the ship while we trawl):
Fulmar at Sunrise
New animals seen
short-tailed albatross (endangered)
brittle stars- Ophiura sp.
basket star
hermit crabs
2 types of cockles- Clinocardium sp. and Serripes sp.
Tanner crab
Aleutian moonsnail
Arctic moonsnail
amphipods
Dall’s porpoises
flounder- Kamchatka flounder
spiny lumpsucker (at right)
lumpsucker
walrus
Weather Data from the Bridge Time: 1400 Latitude: 59.12 N Longitude: 174.02 W Cloud Cover: 5/8 Wind: 17 knots Air Temperature: 8° C/ 46° F Water Temperature: 7° C/ 45° F Barometric Pressure: 1006.9 mb
Aside from weather helping you decide what to wear for the day, weather is critical on board a research vessel. Each hour the bridge collects the same data that is then input into the AMVER Sea system and sent to NOAA Weather. Some of the information included is: time, latitude, longitude, cloud cover, air and water temperatures, wind, barometric pressure, visibility, and swell height. This helps determine our exact location (check out NOAA Shiptracker for more information) as well as the weather at sea and also weather inland. It is not uncommon for marine weather systems to move inland. This information also helps us understand long term climate changes, precipitation, and ocean currents.
Exactly where are we?
The latitude and longitude help determine the position of the ship and the time is recorded to understand how the ship is moving and in what direction. This allows the scientists to follow the transects to conduct their research. If I told you at 1500 hours (3pm) our mark was 58.00N and 171.48W, you would be able to pinpoint our location on a map. Our latitude so far on this trip (July 7th) has been in the range of 56.12N-58.69N depending on the transect that we are following and the longitudes’ range is between 170.01W-171.48W.
Map of ship route
It’s cloudy again?
Clouds from the deck
It tends to be quite cloudy and foggy here in the Bering Sea and cloud cover is measured in eighths of the sky. For example, on July 6th the cloud cover at 1500 hours was 7/8 which means that 87.5% of the sky was filled with clouds. Cloud type and location can help predict the type of weather. The majority of our days have been 8/8 or 100% cloud cover with stratus clouds and lots of moisture in the air.
This is definitely not the heat wave they are getting back home!
This brings us to air temperature and wind. The temperature is always taken on the windward side of the ship because this is the side of the ship in the stream of air fresh from the sea that has not been in contact with or passed over the ship. There are two types of thermometers in each case on the deck in front of the bridge. The dry bulb measures the air temperature and the wet bulb has a muslin wick which absorbs heat from the thermometer. The temperature difference between the two, called the depression of the wet bulb, can help determine what the percent humidity is by referring to the humidity chart. Wind can affect these readings which is why there are thermometers on either side of the bridge. The wind direction is logged as the same direction from which the sea waves are coming. Average temperature through July 7th for Leg II has been 5.680C/420F with winds averaging 10.29 knots. The weather mentioned has been the trend for Leg II; however, this could be changing by the end of the week…stay tuned!
Wet Bulb-Dry Bulb
Hold on tight!
It’s July 10 and we are still waiting for the big seas to hit us. (not that I am complaining about calm weather!) The swells have gotten larger and the wind definitely picked up yesterday. The strongest wind recorded yesterday was 26 knots while on my shift. There is still a chance for NW sustained winds up to 25 knots and 10 foot seas before the weekend is up. Part of the reason for calmer seas yesterday was that we were so far north and the low pressure system was to the south of us. It was actually the farthest north I have ever been, and we will go even farther north before it is time to head back to Dutch Harbor.
Word of the day
guile: deceit
New Vocabulary
barometric pressure: the downward force that the atmosphere exerts per unit of a certain area.
swell height: measure of wind waves generated locally; vertical distance between trough and crest
muslin wick: plain woven cotton fabric
humidity: the amount of moisture in the air
gale force winds: strong winds between 28-47 knots
Where are we? Time: 1500 Latitude: 57.59N Longitude: 171.10W Cloud Cover: 100% Wind: 11 knots Air Temperature: 7.20 C/ 44.960 F Water Temperature: 5.50 C/ 41.90 F Barometric Pressure: 1010 mb
Now that I have provided you with information about the importance of pollock and how the Oscar Dysonworks to survey the stock in the Eastern Bering Sea, I wanted to answer a few related questions.
What about other species?
In the Bering Sea, pollock are so abundant that our mid-water trawls capture mostly pollock. However, there are a lot of other species in the Bering Sea that scientists are interested in. In addition to the Oscar Dyson, NOAA charters fishing boats (such as the Alaska Knight and the Aldebaron) to trawl on the ocean floor. This allows scientists to see more species in the Bering Sea. These ships trawl all day; sometimes up to 6 trawls a day. The groundfishing boats cover the eastern Bering Sea shelf, extending up to the region around St. Lawrence Island (a wider area than the Oscar Dyson will cover). While the Oscar Dyson focuses on euphausiids and pollock, the groundfishing boats examine everything else found on the bottom.
Who owns the water?
International laws provide countries with an Exclusive Economic Zone (EEZ) within 200 miles of their shoreline. The area we are studying in the Bering Sea can be fished solely by fishing boats operated in the United States. On the other side of the Sea, Russians fish in their own 200-mile zone. However, in the middle there is a “donut hole” which is considered “international waters.” This Donut Hole supported a large pollock fishery in the late 1980’s. Here is a diagram showing the Donut Hole (interesting note, it is also called the Donut Hole in Russia (or at least called Bubleek — the Russian word for a donut hole.))
How do American scientists collaborate with scientists from other countries?
The United States works with other Pacific countries to conduct research on the Pacific Ocean and the Bering Sea. For example, the Oscar Dyson, in addition to hosting two Teachers at Sea, is hosting two Russian scientists from the Pacific Research Institute of Fisheries and Oceanography (TINRO) in Vladivostok, Russia – Mikhail Stepanenko and Elena Gritsay. I had the opportunity to sit down with Mikhail the other night and asked him about his experience and how he ended up on the Oscar Dyson.
Mikhail Stepanenko
Born and raised in Primorye, Mikhail spent a great deal of time at the Ussuri River. He studied biology at The Far East State University in Vladivostok and began researching at sea soon after his graduation in 1968. After the first USA-USSR agreement regarding marine research, Mikhail visited the United States and worked out of La Jolla, CA starting in 1969. He has spent about 5-6 months at sea per year for the last 40 years, including the last 18 summers on the NOAA summer pollock survey (specifically on the Oscar Dyson and its predecessor the Miller Freeman). This wealth of experience has made Mikhail an expert and he is a well-respected member of the Pacific marine science community.
Throughout the years, there have been numerous conferences between stakeholder countries and Mikhail has played an active role in recommending action for working together to maintain the populations of pollock and other fish. Mikhail has served on the Intergovernmental Consultative Committee (ICC) – a six-nation committee that meets biannually to discuss fishing polices in the “donut hole.” In addition, Mikhail worked as a Russian delegate during meetings which led to the creation of PICES (North Pacific Marine Science Organization), an “intergovernmental scientific organization, was established in 1992 to promote and coordinate marine research in the northern North Pacific and adjacent seas.” (Visit their website for more information.) Mikhail was elected Chairman of the Fisheries Science Committee (FIS), a branch of PICES, in 2008 and is currently preparing for their next meeting in October.
Each organization is trying to find the best policies to help understand the organisms through reproduction, population dynamics, stock assessments and fishery management. Mikhail’s wealth of knowledge, collaborative scientific research and commitment to the sustainable fishing benefits all members of the international community and we are lucky to have such a science superstar in our midst.
In a previous post, I briefly mentioned that acoustics helps Oscar Dyson scientists locate aggregations of pollock. I didn’t know much about acoustics surveying before I arrived on board but think its pretty cool.The Oscar Dyson has 5 transducers on its center board and 1 temporary transducer on the side of the center board that looks horizontally. The transducers allow us to see where the fish are. Because of where the transducers are placed, we can only see the pollock from 16m to the bottom. This means that if there are any fish between the surface and 16m they will not be detected. This is the near surface “dead zone”. At right you will see a picture of the acoustic data picked up by the transducers. Why this happens? The transducers are mounted on the bottom of the centerboard about 9 m below the water line, and near the transducer face (first 7 m), no good data are collected. Why it’s okay? Pollock tend to hang out in mid-water. Although a few baby pollock might be in the near surface “dead zone,” the majority of pollock will be in the area we are watching. There is also a bit of a “dead zone” at the other end near the ocean floor.
Acoustic Data
Why acoustics?
Ideally, the acoustic data collection would allow us to track aggregations of pollock without actually having to fish them out of the water. All parties involved (scientists, fish, bank accounts) would benefit from this change but scientists are still in the process of perfecting this process. The Oscar Dyson is part of a fleet of five boats that was specifically designed for acoustics. Specifically, it is considered a “quiet boat” where the engine noise is decreased to prevent scaring the fish. Other acoustic projects include: Pacific hake off the coast from California to Vancouver Island (run as a joint project with Canada), herring in the northwest Atlantic, and krill in the Antarctic. Acoustics are used throughout the globe and many countries depend on acoustics for their fish surveys.
Sonar
Looking in more than one direction
Along with the transducers, there is also a multibeam SONAR that produces the same information as the transducers but with a wider angle range. Scientists use this program to help separate species in the water column. The multibeam ME70 sends its signal out after the transducers information is sent and returned. They alternate about 1.5 seconds apart. Scientists around the world are working to improve this technology and we use information from a group at University of New Hampshire along with a program from Tasmania to analyze these data. Scientists utilize the multibeam ME 70 along with the transducers and fish trawling to ensure they are capturing an accurate picture of the mid-waters.
How the survey data we collect are used.
The data we collect on the Oscar Dyson during the summer pollock surveys are used by scientists and policy makers to determine the fishing quota (the “take”) of pollock for the next season. Quotas are important for maintaining the population of pollock (and other species) for this generation and generations to come. The data we collect on the Oscar Dyson help ensure that maximum stock can be taken without negatively impacting the Eastern Bering Sea pollock population.Thought Question: What could happen if we didn’t regulate the amount of fish that could be caught? Bonus points for anyone who can identify an area where overfishing has impacted the ecosystem.
