Louise Todd, Haul Back, September 23, 2013

NOAA Teacher at Sea
Louise Todd
Aboard NOAA Ship Oregon II
September 13 – 29, 2013

Mission: Shark and Red Snapper Bottom Longline Survey
Geographical Area of Cruise: Gulf of Mexico
Date: September 23, 2013

Weather Data from the Bridge:
Barometric Pressure: 1009.89mb
Sea Temperature: 28˚C
Air Temperature: 28.2˚C
Wind speed: 8.29knots

Science and Technology Log:

The haul back is definitely the most exciting part of each station.  Bringing the line back in gives you the chance to see what you caught!  Usually there is at least something on the line but my shift has had two totally empty lines which can be pretty disappointing.  An empty line is called a water haul since all you are hauling back is water!

After the line has been in the water for one hour, everyone on the shift assembles on the bow to help with the haul back.  One crew member operates the large winch used to wind the main line back up so it can be reused.

Line on the winch

Winch holding the main line

The crew member operating the winch unhooks each gangion from the main line  and hands it to another crew member.  That crew member passes it to a member of our shift who unhooks the number from the gangion.  The gangions are carefully placed back in the barrels so they are ready for the next station.  When something is on the line, the person handling the gangions will say “Fish on”.

Nurse Shark on the line

Nurse Shark on the line

Everyone gets ready to work when we hear that call.  Every fish that comes on board is measured. Usually fish are measured on their sides as that makes it easy to read the markings on the measuring board.

Measuring Grouper

Measuring a Yellowedge Grouper (Photo credit Christine Seither)

Measuring a Sandbar

Christine and Nick measuring a Sandbar Shark

Each shark is examined to determine its gender.

Sexing a shark

Determining the sex of a sharpnose shark (Photo credit Deb Zimmerman)

Male sharks have claspers, modified pelvic fins that are used during reproduction.  Female sharks do not have claspers.

Claspers

Claspers on a Blacktip

Fin clips, small pieces of the fin, are taken from all species of sharks.  The fin clips are used to examine the genetics of the sharks for confirmation of identification and population structure, both of which are important for management decisions. 

Shark Fin Clip

That’s me in the blue hardhat taking a fin clip from a Sandbar Shark(Photo credit Lisa Jones)

Skin biopsies are taken from any dogfish sharks  in order to differentiate between the species.  Tags are applied to all sharks. Tags are useful in tracing the movement of sharks.  When a shark, or any fish with a tag, is recaptured there is a phone number on the tag to call and report the location where the shark was recaptured.

Some sharks are small and relatively easy to handle.

Cuban Dogfish

Small Cuban Dogfish (Photo credit Christine Seither)

Other sharks are large and need to be hauled out of the water using the cradle.  The cradle enables the larger sharks to be processed quickly and then returned to the water.  A scale on the cradle provides a weight on the shark.  Today was the first time my shift caught anything big enough to need the cradle.  We used the cradle today for one Sandbar and two Silky Sharks.  Everyone on deck has to put a hardhat on when the cradle is used since the cradle is operated using a crane.

Silky Shark

Silky shark coming up in the cradle

Sandbar Shark

Sandbar Shark in the cradle

Personal Log:

I continue to have such a good time on the Oregon II.  My shift has had some successful stations which is always exciting.  We have had less downtime in between our stations than we did the first few days so we are usually able to do more than one station in our shifts.  The weather in the Gulf forced us to make a few small detours and gave us some rain yesterday but otherwise the seas have been calm and the weather has been beautiful.  It is hard to believe my first week is already over.  I am hopeful that we will continue our good luck with the stations this week!  The rocking of the boat makes it very easy for me to sleep at night when my shift is over.  I sleep very soundly!  The food in the galley is delicious and there are plenty of options at each meal.  I feel right at home on the Oregon II!

Did You Know?

Flying fish are active around the boat, especially when the spotlights are on during a haul back at night.  Flying fish are able to “fly” using their modified pectoral fins that they spread out.  This flying fish flew right onto the boat!

FlyingFish

Flying Fish

Annmarie Babicki, August 10, 2010

Time:NOAA Teacher at Sea: Annmarie Babicki

NOAA Ship Name: Oregon II
Mission: Shark and Red Snapper Bottom Longlining
Geographical area of cruise: Gulf of Mexico
Date: August 10, 2010

Weather Data

Latitude:  25.36 degrees North
Longitude:  82.56 degrees West
Clouds: Overcast and occasional showers
Winds:  11.5 kts
Temperature: 28.6 Celcius or about 84 degrees Fahrenheit
Barometric Pressure; 1010.04

Science and Technology:

  I am working here in the Gulf of Mexico with a scientist who is completing shark stock assessments.  It is a long term study, which monitors population trends of all shark species in the Gulf.  The data collected from this survey is used in conjunction with data from many other studies to determine fisheries policy. One example of this could be the determinations of how large a catch can be and how long the catch season can be.  Policies are not only different by species, but also by whether the catch is for recreational or commercial use.
Today we began the shark survey and completed locations off the coast of Florida.  The locations are chosen at random, so that the data is objective and the findings are not skewed.  During each sampling the following information is recorded: shark species, its length, weight, sex, and the stage of its maturity.  The coordinates for each survey are also recorded, which enables scientists to know where particular shark populations exist. The number of stations completed per day varies depending on how far the stations are from one another.  Generally, the amount of time it takes to complete it is approximately two hours.

Bait bucket

Hi-flyer being dropped in the water

The methodology used to collect data on sharks is called bottom longlining.  This is when each hook are baited with mackerel and put on a gangion. We cut our own bait and attach it to the hooks.  Each hook is assigned a number, one to one hundred, so that it can be tracked. That line is then systematically hooked onto another line that runs one nautical mile.  Both ends of the line have what are called hi-flyers that float vertically in the water.  They are bright orange and have a blinking light on the top, so that they can be seen from a distance. There is a weight placed on both ends of the line and one in the middle. The weights help to keep the baited lines well below the surface.  After the last gangion is put on, we wait one hour and then begin to pull in all hundred lines. During this entire process the ship is moving, which can be sometimes challenging, especially in bad weather.

Measuring the length of a barracuda

weighing a barracuda

A tagged tiger shark

Although the focus of this survey is sharks, data is collected on all fishes that are captured. After the fish are pulled up on deck, data is collected and recorded by the hook number. The handling of sharks is different from the handling of fish.  Only sharks are fitted with a tag, which does not hurt them.  There are two types of tags, but to date we have only used one type.  In order to attach the yellow tag, a small slit is made underneath the dorsal fin. The tag has a sharp point on one end, which is inserted into the slit.  Also a small sample (5-10 cm) of the shark’s pelvic fin is taken.  This is then taken to the lab where DNA testing is done.  The DNA can be used to verify known species and unknown or new species. Also, scientists can compare the population of sharks in other oceans around the globe by their DNA. What I have observed on every catch is that the scientist carefully monitors the shark to ensure it is not being stressed or could be hurt in any way.
Today we caught this beautiful and powerful scalloped hammerhead shark.  When very large sharks like the hammerhead are caught, they are not pulled up by the line because it can damage them and they are too heavy to handle.  Instead they are guided onto a cradle which sits in the water. Once on securely they are hoisted to the side of the ship where scientists can collect the needed data. The hammerhead weighed in at 341lb. and was 8 feet long. What a catch this was, everyone was very excited.

Scalloped Hammerhead Shark

The cradle used to raise sharks in and out of the water.

Personal Log

The day started out cloudy but eventually turned over to showers and then to a hard rain.  We are feeling the effects of the tropical depression, which explains why it is difficult for me to stay standing for any length of time.  I am hitting and seeing more walls than I care to!  Also, it is a very bizarre feeling when the chair you are sitting in moves from one side of the room to the other.  Luckily I have fended of sea sickness, but I did have a mild case of nausea, however, nothing that stopped me from continuing to work on deck.  Thank goodness for Bonine.
Sleeping has not been much of a problem for me except when the ship’s engine changes.  The engines make a deep loud growling sound that wakes me for just a few minutes. Being out in the fresh air does make me tired, so I have to set my alarm clock or I will sleep through my next shift. It’s hard to know what day it is because I am working a noon to midnight shift. You keep track of time by when the next sampling is due.

Being at sea and doing this type of research is definitely only for the hearty.  The weather changes often as does the pace of the work.  There are many jobs to do during sampling and I am trying to learn all of them.  Baiting a hook and taking off bait has been frustrating, particularly since it has to be done quickly.  The type of hook they use has a barb on it that goes in a different direction from the rest of the hook, so it doesn’t just slide out.  We wear special gloves to protect our hands from the hooks and skin of the sharks, which can feel like sand paper or razor blades depending on the shark.  They say that practice makes perfect. Well, I have a lot of practicing to do!
My next adventure is to learn how to hold sharks and not be afraid of them.  I’ll keep you posted.

“Answer to Question of the Day” The fin clip is an actual piece of a fin that has been cut off the shark to be used for DNA testing.”Question of the Day”  What is a wet and dry room on a research vessel?

“Animals Seen Today” red groupers, tiger sharks, sandbar sharks, scalloped hammerhead, sharpnose shark, and sea birds