NOAA Teacher at Sea
Aboard the NOAA Ship Pisces
July 16– August 1, 2013
Mission: Southeast Fishery-Independent Survey (SEFIS)
Geographical area of cruise: southeastern US Atlantic Ocean waters (continental shelf and shelf-break waters ranging from Cape Hatteras, NC to Port St. Lucie, FL)
Date: July 22, 2013
Weather Data from the Bridge
Science and Technology Log
Yesterday was a very exciting day. After we dropped off our first traps, the ship’s officers brought the ship to a full stop and it was time to release the CTD. What is a CTD? CTD stands for Conductivity, Temperature, and Depth. The CTD unit is an array of sensors that is lowered to just above the bottom of the ocean to take a continuous profile of the water column. Moments after the CTD reaches the bottom it is brought back to the surface and the deck hands bring it back on board the ship. From here, the scientific crew can analyze the data from the CTD to determine the water conditions for the drop area. On some expeditions, the CTD is fitted with a device that actually takes water samples at the different depths for chemical and biological analysis. This information allows the scientists to get a complete picture of the water column where the traps are set and where the fish live.
Another instrument that is used by the ship is the Expendable Bathythermograph or XBT. This device was used by the military for many years to measure the temperature of the water at various depths. The most interesting thing about this probe is how it is deployed.
Warren Mitchell, a fisheries biologist for NOAA’s Beaufort Laboratory, decided it would be a good idea for me to be trained firsthand to deploy this vital instrument. The first thing I had to do was put on my hardhat and safety vest and step on to the recovery deck. At that point Warren called up to the bridge to ask for permission to drop the XBT. The officers on the bridge gladly gave us permission and Warren then got me into a launching position with my feet spread apart and my elbow braced on hip. The CO then happened to walk by and asked me if I had my safety glasses on, to which I immediately said yes.
It was at this point that Warren gave me permission to launch the XBT. I was excited. I was ready. I could not wait for Warren to give me the signal. The only problem was I did not know the signal and I could not find the trigger. I did not know what to do. I was getting worried. Warren then repeated the orders “launch”. “How?” I replied. Tip the barrel forward, lean forward, he replied, and the XBT slid out of the tube into the water.
The joke was on me. Here I had been led to believe that this was going to be some grand launch something just shy of the space shuttle taking off into space. The reality was that the XBT just falls into the water. Very non-exciting for me but everyone on the boat laughed for hours. So did I. It is good to be treated like one of the family. After our final set of traps for the day, I ventured out to see what it is like to work in the acoustics lab.
To this point this expedition has been so amazing. Would you believe there are 3 people aboard the NOAA Ship Pisces that live or once lived within 60 miles from my home town? Crazy I know. We have had only one medium sized squall to this point with 3 to 5 foot seas. We have brought up traps with tons of jellyfish, in which I got a nematocyst (jellyfish stinging cell) to the hand. It was not too bad but I did feel a slight burning sensation.
We have had a number of different types of starfish, all of which I have never seen. One particular trap that we sent to the ocean floor, while upon retrieval did not have any fish, but did have a secret to share. After Julie Vecchio, one of our volunteer scientists replayed the video cameras that are on the top of the trap, we discovered that a nurse shark had been trolling the area around our trap. I have seen so many amazing things. Several days ago we were hauling traps and just as we brought our trap up there was a sea turtle that came up to the boat. I snapped a couple of photos, as quick as I could and then went right back to work. It was not two minutes later and I saw a baby sea turtle the size of a fifty cent piece. Immediately, the first thing that came to my mind was thought of Crush and Squirt from Disney’s Finding Nemo talking to me.
Crush: Okay. Squirt here will now give you a rundown of proper exiting technique.
Squirt: Good afternoon “Paul”. We’re gonna have a great jump today. Okay, first crank a hard cutback as you hit the wall. There’s a screaming bottom curve, so watch out. Remember: rip it, roll it, and punch it.
Paul: Whoa! Dude! That was totally cool!
Tuesday July 23, 2013
Somewhere in the middle of the night the wind picked up and so did the waves. I share a stateroom with Zach Gillum a graduate student from East Carolina University. This kid is amazing. We really have become great friends.
One of the great things about this trip is to be totally immersed in an expedition with like-minded people. We will all hang around waiting for traps, or eating dinner and start conversations about some environmental issue or ecological principle. I sure wished I lived closer to my new friends. Anyway, our stateroom window is about 4 foot above the waterline. Many times during the night, our window was under the water as a wave passed by. When we woke up, the wind and waves increased. A four to seven foot wave is enough to make many run for the toilet. So far so good for me when it comes to sea sickness.
I just hope we don’t find any bigger waves. We gathered on the aft deck as we usually do but we delayed deployment, waiting for improvement in weather conditions. The major problem we had was with larger waves comes the possibility of the traps bobbing up and down on the ocean floor. With adverse conditions on pick-up, we are also more likely to drag traps across the bottom. We set the first six traps, pulled them up and just as we had suspected not many fish. Around 1:00 P.M. Zeb Schobernd, our Lead Scientist, made the decision to head to another location. It just goes to show you that when you are at sea, you need to follow the 3 F’s. Flexibility, fortitude, and following orders.
Did You Know?
Did you know that a jelly fish’s nematocyst are like mini speargun?
These little stinging cells fire when they come in contact with the surface of and organism. Some jellyfish tentacles can contain up to 5000 or more nematocyst.