Thomas Ward – Page 2 – NOAA Teacher at Sea Blog

September 14, 2010April 22, 2021

Thomas Ward, September 14, 2010

NOAA Teacher At Sea: Thomas Ward
Aboard NOAA Ship Miller Freeman

Mission: Fisheries Surveys
Geographical Area of Cruise: Eastern Bering Sea
Date: September 14, 2010

After the Catch

This segment is devoted to what happens to the organic material we acquire once we get it on board. The benthic sled has a very fine mesh net, plankton net, attached to it and has a container at the end of it, a cod end. This is where the epibenthic invertebrates end up. Once the gear is on board the crew washes down the net with sea water to get any invertebrates to wash down into the cod end. It took getting used to that the garden hoses around deck have salt water in them. Growing up all your life using hoses outside with fresh water in them and then being on board here and getting an occasional spray to the face and it is salt water is a reminder of where I am really at. Any how, the sample in the cod end is put into a jar and preserved in a buffered Formaldehyde solution.

The beam trawl is used to study settlement and nursery areas for age-0 flatfishes. This is probably what most people would associate with net fishing. When the haul comes up there is an assortment of organisms in it. The catch is dumped in to a kiddie pool and we gather around it and start to sort, flopping flat fish and all.

These pictures are a good example of what we are doing. Remember that we are primarily studying juvenile species and what is the primary mechanism in nature that helps these little ones become adults.
The fascinating thing is the differences in the catches per location. Once the fish that are the focus of this study have been sorted, they are measured, weighted, bagged and frozen. They are carefully labeled and frozen at a temperature of -80 degrees Celsius in the rough lab. After 24 hours they can be moved to a “warmer” freezer, -20 degrees Fahrenheit, which is in the slime lab.

The catch comes on board at the stern of the ship, which is the open rear of the ship where the majority of the heavy equipment is, like cranes and such. After the catch is sorted it is brought into the wet lab for measuring, weighing and bagging. The measuring board that we have in this lab is very cool. There are touch screen monitors that are set up where the species that we are concerned with is selected. The correct species is chosen and the fish are individually placed on this electronic board. The scientist then puts the individual fish nose at one end and takes a hand held device and places it near the tail. The machine makes a funky sound and the length of the fish is recorded electronically. Very cool, quick and convenient. With a good team working this station, a fish can be measured about one every second, pretty efficient.

The benthic grab is specifically used to sample subtidal soft-bottom benthic macroinvertebrates. This is done to determine what is in the substrate. This is the layer just below the surface. This is what the juvenile flat fish feed on. When determining what causes a population’s numbers to fluctuate it is important to study what it eats

The jellyfish above are very cool but not of much interest to this study. The sole above is one of the larger flat fish that we have caught. We do catalog them but we do not save them for future study. The interesting thing that I want to point out about the picture of the sole is the location of their eyes. Both eyes are on the same side of their body. These fish lay on the bottom and wait for prey to swim by. It is and was a huge evolutionary advantage for them to have both eyes on one side of their body.

Life on board ship is a very different experience. Yesterday was proof of that for me when the seas turned to 7-9 feet and my body could not handle it. The crew amazed me because word of my illness spread around and many pepole have been asking me how I have been feeling today. It is what I would call a concerened, caring, working family. At first coming aboard, getting around the ship was very confusing. There are numerous stairways that lead to different decks and there is a very similar look to things on the ship. I am getting used to it and to stepping through a bulkhead to walk through the ship. These bulkhead doors are water tight doors that are closed to protect parts of the ship in case of an accident. The sleeping quarters are sufficent. I am in a 4 man room with 3 other guys, with a bathroom attached to it. I have my own personal locker which contains my personal effects and my life jacket and survival suit. On the door the crew placed a billet which is a document that is specifally designed for the individual. Among other things it gives my lifeboat station which we would have to muster to if an emergency occurred. We have practiced this drill and hope that it does not become real any time soon. I am in a lower bunk. The noise and the motion of the ship is the hardest thing to get used to. I occasionally sleep with ear plugs but that does not seem to help much. A solid, uninterupted 8 hours of sleep will be very much appreciated when I return. But, as any one that knows me knows that I can definately catch up on sleep by napping, and just about anywhere.

Remember that if you have any questions you can ask through this blog. I believe you have to sign up for a Google account but it seems to do anything on the web these days you either have to register or sign on in some manner. Just click the commnets icon towards the bottom of the blog and follow the prompts, it is not too cumbersome. I hope you have enjoyed reading this and I am almost done describing the science so I hope the questions start rolling in. Hope for flat seas for me.

September 13, 2010April 22, 2021

Thomas Ward, September 13, 2010

NOAA Teacher At Sea: Thomas Ward
Aboard NOAA Ship Miller Freeman

Mission: Fisheries Surveys
Geographical Area of Cruise: Eastern Bering Sea
Date: September 13, 2010

The Procedure

The way that we collect data is done by three methods. They are the beam trawl, the benthic sled and the benthic grab. The beam trawl is a metal beam supported by a cable on the ship. Hanging from the beam is a net that when dragged behind the ship opens up. The trawl is pulled behind the ship for a specific amount of time.

The benthic sled is a piece of equipment that looks like it would be right at home on the snowy slopes of Central New York. It is a sled that gets dragged on the bottom and collects plankton (look out Eugene). The net is a finer mesh than the one used on the beam trawl. At the end of the net is a container that collects the plankton, we call it a cod end. At the opening of the net is a device called the flow meter which looks like a little hand held fan. This performs the function of measuring the amount of water or flow that is going through the net. The meter has a counter on it and needs to be read and reset at each sampling station. This instrument gives the scientists a sense of the volume of water flowing into the net.

The last device we are using is the benthic grab. This device and the wet bulb on the bridge are instruments closest to my curriculum, Earth Science. In fact, while on the bridge one officer asked another for the wet bulb temperature, very cool, I almost pulled out my sling psychrometer and compared data. Any how, the grab is opened up and set and then lowered into the water. When the grab hits the bottom, the weight and the downward force of the grab forces it shut, and into the bottom, scooping up sediment as it closes. Of course because of the nature of this scientific expedition we are more concerned with organic matter than sediment. I will have to say the scientist that I am working with have a natural curiosity toward all of Earth’s wonders.

These devices are deployed one at a time. After each piece returns to the surface the crew maneuvers the ship so that subsequent samplings are performed at the same area.

I was going to write about life on board but the seas have gotten rougher and I am sea sick.

September 12, 2010April 22, 2021

Thomas Ward, September 12, 2010

NOAA Teacher At Sea: Thomas Ward
Aboard NOAA Ship Miller Freeman

Mission: Fisheries Surveys
Geographical Area of Cruise: Eastern Bering Sea
Date: September 12, 2010

Getting Started

The cruise and scientific research seems to be finally going forward. We are currently in the Eastern Bering Sea. You can find the exact location of the ship by clicking on the following link http://shiptracker.noaa.gov/default.aspx then going to the drop down menu “Pick a Ship” and clicking on the “Miller Freeman” That long list that you see are ships in the NOAA Fleet. While looking at the map you will see data about the ship’s location, speed and other interesting things. One bit of data that is given is the current water depth. The water depth here is relatively shallow because we are on the continental shelf. Currently, we are in 44 meters of water, about half a football field. If you look at the map and notice just below, or south of the islands that we are near, the blue shading becomes a little darker. This is called shaded relief bethymetry and indicates that the water gets deeper. This is where the continental slope is. The cartographer, map designers, could have used isolines to show this change. Another bit of data at this site is water and air temperature. I want to remind you that if you come upon a unit of measurement that you do not understand or can not relate to, such as air temperature given in degrees Celsius, you can use Google to convert it. For example, the current air temperature is 9.15 degrees Celsius. That is difficult for me to relate to, do I need a hoodie or not, so if you type “convert 9.15 c to f” Google will tell you that it is 48.47 degrees Fahrenheit. A little chilly but not too bad. In fact check out how close the air temperature is to the water temperature. Also, putting “define” before a word in Google will define a word that you may not understand. While reading this or looking at any of the other data you can always ask me a question through this blog.

The scientific research is primarily based around conducting an ichthyoplankton (remember Google) and juvenile fish survey in the waters around the Alaskan Peninsula, and the Bering Sea middle shelf. The locations of the 113 sampling stations are predetermined and the ship’s crew is responsible for getting the scientific crew to these locations. The sampling stations are found using latitude and longitude. We are currently at 5510.825N, 16343.513W. We are at 55 degrees north, 163 degrees west. The numbers that follow are minutes measured to an accuracy of thousandths. If you noticed the data on the ship tracker web site is a little different and not as precise as the on board data. The negative in front of the longitude indicates west. Degrees and minutes are used and not seconds.

This adventure for me has started out pretty rough but now that we are collecting data and doing science it is getting very exciting. The phrase “getting your sea legs” which refers to your body becoming accustomed to the movement of the ship is very true. On the other hand I had never heard of “land sickness” before. When we first went out the seas were relatively flat, 3-4 feet, and I felt just a little off (my students would say I am alot off, but that is OK) and it took me a few days to adjust. Then we had to go back to port and while back on land I felt ill. The Earth would appear to move and I would have to hold on to something to help reality take hold. After talking to a few people they said this is common. Everyone on board is really nice and the food is plentiful and delicious. I really want to get this posted so I can have something for everyone to read so I will end it here. I will post again soon so stay tuned, pictures of our catches and a description of how we perform the sampling soon to come.