bottom trawl – Page 4 – NOAA Teacher at Sea Blog

June 19, 2006March 18, 2021

Jacob Tanenbaum, June 19, 2006

NOAA Teacher at Sea
Jacob Tanenbaum
Onboard NOAA Ship Miller Freeman
June 1 – 30, 2006

Mission: Bering Sea Fisheries Research
Geographic Region: Bering Sea
Date: June 19, 2006

Weather Data from the Bridge

Visibility: Less than 1 mile
Wind Speed: 14 miles per hour
Sea Wave Height: 2 feet
Water Temperature: 44.06 degrees
Air Temperature: 41.36 degrees
Pressure: 1018 Millibars

Personal Log

NOTE: We will arrive in the port of Dutch Harbor, Alaska on June 20. As the project draws to a close, I would like to evaluate how effective it was. There is a link to an electronic survey. I would like to ask students, teachers, parents, and other visitors to the site to take a few moments to let me know what you think of this idea. The survey is all electronic and only takes a minute or two to complete. Thank you in advance for your time. Click here to access the survey. I should be able to send one more blog tomorrow from Dutch Harbor. Check back and I will let you know what being on land again feels like. Dutch Harbor should be an interesting place.

We passed the Pribilof Islands. Home to one of the largest worlds largest gatherings of marine mammals in the summer time. I got up to see the islands at midnight and again when we passed a second one at 4:00 AM. We were covered in fog both times, so we will have to come back another day. At midnight, the sun had not yet set. Our sun set last night at about 12:15 and it took a long time to grow dark after that. The sky began to grow light at about 5:00 and it came up a little after 6. A short night.

Science Log

Last night we had another bottom trawl. This one had some of the largest sea stars I have ever seen. One was close to a foot long. In addition, there is a coral here called sea raspberry. It is common along the Bering Sea Shelf. I thought coral was only in tropical seas, but here it is in the Bering Sea. Since it is our last day at sea, I spoke to our Chief Scientist Dr. Paul Walline from the Alaska Fisheries Science Center in Seattle Washington about what we have learned so far.

What does the data tell you so far?

What do you expect to see in the next legs?

What will happen to the data at the end of the cruise?

Finally, we were testing a platform today that can open nets at different depths. We lowered the platform to about 390 feet before a technical problem forced us to raise it back up to the surface. As an experiment of my own, I tied a bag of Styrofoam cups to the platform to see what the pressure at that depth would do to them. Want to see more? Click here for a video

Question of the Day:

What was your favorite part about participating in this project. Please write and let me know.

June 18, 2006March 18, 2021

Jacob Tanenbaum, June 18, 2006

NOAA Teacher at Sea
Jacob Tanenbaum
Onboard NOAA Ship Miller Freeman
June 1 – 30, 2006

Mission: Bering Sea Fisheries Research
Geographic Region: Bering Sea
Date: June 18, 2006

Weather Data from the Bridge

Visibility: 10 miles
Wind Speed: 9 miles per hour
Sea Wave Height:2 feet
Water Temperature:41 degrees
Air Temperature:40.8 degrees
Pressure: 1013 Millibars

Personal Log

By now, you have met many of the interesting people aboard NOAA ship MILLER FREEMAN. There are three groups of people aboard these ships. The officers on the ship are part of the NOAA Corps. This is a uniformed service of the United States consisting of about 300 officers who complete rigorous training and hold ranks, like ensign, or commander. They are in charge of ships operations and stand watch on the bridge. The scientists aboard are mostly from NOAA research labs, like the Alaska Fisheries Science Center in Seattle. Many of the other members of the crew are civilian wage mariners. These are professional sailors who handle many of the day to day operations of the ship. Some, such as Chief Engineer Bus, have made their home on this ship for close to 30 years. Other sailors are contract workers who come aboard for a few months, go home and take a break, then join the crew of another ship for a different sort of cruise. Sometimes they are on research vessels, sometimes they are on freighters, sometimes they are on tankers. Today, lets meet able-bodied seaman, or AB Michael O’Neal. Click each question to listen to the answer.

What do you do on board the NOAA Ship MILLER FREEMAN?

Tell us about what you have done and where you have gone on some of the other ships you have been on.

Where are some of the other jobs you have had at sea?

What does it take to be an able-bodied seaman?

Science Log:

Smile! Here are big mouth sculpins. Once close up and one in the hands of Dr. Mikhail Stepanenko. — Smile! This is a big mouth sculpin.

We had another in a series of amazing bottom trawls last night. When the nets trawl along the bottom out here, some of the most interesting creatures of all get swept into our nets. Creatures that live on the bottom are often stranger looking for a few reasons. They are adapted to blend into the bottom so that predators cannot see them. They often wind up looking like rocks or plants as a kind of defense. They are also adapted to an environment with higher pressure and less light than the surface. Some of their adaptations can also make them look very different from other fish. Since they don’t have to worry about predators below them, these fish may be flat and have both their eyes sticking up. These creatures often do not need to be fast swimmers, since their defense is to blend into the environment rather than swim away when predators approach. The basket of sea cucumbers was one of the strangest things I’ve seen so far. These sticky blobs are not plants. They are sea creatures that live on the bottom of the sea and sift through the sand or water to find food. There are several different kinds of sea cucumbers in this basket. Can you see the different types? Mud stars, on the other hand, are soft and sticky, not like the sea stars we have at home. It may be called a mud star, but I think looks like Patrick from Sponge Bob.

Here is another kind of sculpin with large fins that look like the wings of a butterfly, called a Butterfly sculpin. — Another kind of sculpin with large fins that look like the wings of a butterfly, called a Butterfly sculpin.

Question of the Day

Now that you have seen some of the different jobs aboard NOAA Ship MILLER FREEMAN, if you were on a ship, which job would you prefer? Write me a comment on the blog and let me know!

Answer to Yesterday’s Question

Look at the movements of the ship described above. When the ship drives into the wind and waves, sailors call it a corkscrew motion. Can you think why?

A corkscrew motion occurs when the ship is struck by waves in such a way that it moves in several motions at once. In other words, it may pitch, roll, surge, and sway all at the same time. I’m getting a funny feeling in my stomach just thinking about it!

Answers to Your Questions

Sorry that I left off the link from Friday where you can see the position of the ship. Here it is. Fair warning, the site was down for most of today, so if it does not work, just try again later.

http://info.nmao.noaa.gov/shiptracker/Ship.aspx?ship=Miller%20Freeman

After we put in to port, I’ll have a day or two in Dutch Harbor to look around, before I can get a flight in to Anchorage. After that, I’ll be visiting some friends and family out west before I head back east. Thanks for writing.

June 15, 2005March 18, 2021

Jeff Grevert, June 15, 2005

NOAA Teacher at Sea
Jeff Grevert
Onboard NOAA Ship Delaware II
June 8 – 16, 2005

Mission: Surf Clam Survey
Geographical Area: New England
Date: June 15, 2005

Weather Data

Latitude: 41° 12′ N
Longitude: 070° 45′ W
Visibility: 2 nm
Wind Direction: 220°
Wind Speed: 13 kts.
Sea Wave Height: 2 ft.
Swell Wave Height: 2 ft.
Sea Water Temp.: 13.3° C
Sea Level Pressure: 1007.9 mb
Cloud Cover: 5/8 (Altocumulus, Cirrus)

Science and Technology Log

0000- 0600: After one successful trawl, an electrical component on the dredge lost power. During the next four hours, scientists and engineers dismantled the component and realized that it had a leak which allowed water to enter. The component was most likely damaged when the dredge was dragged over rocks yesterday. The component was repaired by the end of my watch. We then went off watch and ate dinner. When I awoke for my next watch, I learned that the next watch (0600-1200) also experienced power loss to the component. Again it had to be dismantled and repaired.

1200-1800 The dredge and all components worked smoothly for my second watch. Our trawls yielded few clams however. One trawl filled the dredge with nothing but benthic sediment. After being relieved by the next watch I ate dinner and went to work on lesson plans and interviews.

June 14, 2005March 18, 2021

Jeff Grevert, June 14, 2005

NOAA Teacher at Sea
Jeff Grevert
Onboard NOAA Ship Delaware II
June 8 – 16, 2005

Mission: Surf Clam Survey
Geographical Area: New England
Date: June 14, 2005

Weather Data

Latitude: 40° 28′ N
Longitude: 69° 27′ W
Visibility: < 1nm
Wind Direction: 230°
Wind Speed: 12 kts
Sea Wave Height: 1 ft.
Swell Wave Height: 3 ft.
Sea Water Temp: 10.3° C
Sea Level Pressure: 1004.1 mb
Cloud Cover: 1/8 (Altocumulus)

0000- 0600 Went on watch. Conducted a few trawls which yielded ocean quahogs. Bycatch included little skates and starfish. At the end of my watch I ate breakfast and went to sleep.

1200-1800 Conducted more successful trawls. This was the first day that my watch had two uninterrupted watches. We got a lot of work done and had good clam yields. Interesting bycatch included a goosefish. Not knowing any better, my cabin mate stuck his hand in the goosefish’s mouth and got bitten. At the end of my watch I ate dinner and went to work on my lesson plans.

On the next watch the dredge hit an underwater rock field and got mangled. The crew and scientists successfully replaced the front blade assembly with a spare. This halted operations for a while but soon we were back to work.

June 13, 2005March 18, 2021

Jeff Grevert, June 13, 2005

NOAA Teacher at Sea
Jeff Grevert
Onboard NOAA Ship Delaware II
June 8 – 16, 2005

Mission: Surf Clam Survey
Geographical Area: New England
Date: June 13, 2005

Weather Data

Science and Technology Log

We’re back underway 🙂 The repairs went well and the Delaware II set sail at 1400 hours. It was about a three-hour steam to our first sampling station. Once we arrived, there was time on my watch to conduct one trawl. Only one Ocean Quahog was collected. Some bycatch included sea stars, sponges, sand dollars and a crab. At 1800 hours I went off watch and ate dinner. Later I worked on my lesson plans and collected data from the ship’s weather log. Currently I’m waiting for my second watch (midnight). I think I’ll get some rest.