NOAA Teacher at Sea
Onboard R/V Savannah
June 24 – July 1, 2011
NOAA Teacher at Sea: John Taylor-Lehman
Ship: R/V Savannah
Mission: Fisheries Survey
Geographical area of the cruise: Continental Shelf off of Florida
Date: Monday 26, June 2011
Weather Data from the Bridge
South West Winds 10-15 knots
Barometric Pressure 29.73
Science and Technology Log
I assisted in deploying and retrieving 6 “chevron” fish traps at a time. This was done several times at designated sites. The traps are pushed off the back of the boat (fantail) and winched up along the starboard side. Two buoys are attached to each trap. The traps rest on the bottom of the Atlantic between 45 and 230 ft. deep. Locations are determined before the cruise but can be changed if necessary. Ideal locations have hard bottom with some relief.
Traps are baited with 24 “menhaden”, which is a type of fish. Some of the bait is suspended in the trap while other rests on the bottom. The traps “soak” for 90 minutes before being retrieved. There is great anticipation as each trap is being winched aboard the ship. We are all hoping for large numbers of our target fish: grouper and snapper.
This collection technique has been used for 22 years, which allows valid comparisons of data over time. The fish found in the traps thus far are: gag grouper, Warsaw grouper, red snapper, vermillion snapper, sand perch, black sea bass, gray triggerfish.
The entire science staff and ship crew have all been very kind and helpful to me, the novice. They have readily answered all my questions, whether it is about the ship operations or the research being conducted. They have gone out of their way to bring to my attention items or events they think would be of interest to me.
Last evening we spent the last hours of our shift processing black sea bass. I learned how to remove the otoliths from the skull and the reproductive organs from the body cavity. The former can be used to age the fish and the latter to determine maturity and sex.
While walking on the back of the boat last night I heard a great deal of splashing in the water. The lights from the ship were bright enough to illuminate the water below me, so in I was able to see 6 dolphins in the water. They were feeding on the many flying fish that were attracted to the ship’s lights. I imagine a few of the fish were able to escape because the dolphins remained for at least 1.5 hours. Some of the dolphins were able to grab the fish out of the air.
Unusual sights: 4 cruise ships heading south, a double rainbow, oyster toad fish