NOAA Teacher at Sea: Bruce Taterka
Geographical Area of Cruise:
Date: Sunday, July 4, 2010
Weather Data from the Bridge
Time: 1000 hours (10:00am)
Position: Latitude = 27.58.38 N; Longitude = 096.17.53 W
Present Weather: partly cloudy, haze on the horizon
Visibility: 8-10 nautical miles
Wind Speed: 17 knots
Wave Height: 2-4 feet
Sea Water Temp: 28.6 C
Air Temperature: Dry bulb = 29.2 degrees Celsius; Wet bulb = 26.1 C
Barometric Pressure: 1011.1 mb
Science and Technology Log
The purpose of the SEAMAP Summer Groundfish Survey is to collect data for managing commercial fisheries in the
Right now we’re working along the Gulf Coast of Texas, far from the BP Deepwater Horizon oil spill, so we’re not seeing any effects of oil here. However, part of our mission is to collect fish for testing to make sure that oil spill has not impacted the marine life in this area and that the fish and shrimp from Texas are safe to eat. We’re also collecting water samples from this area to use as baseline data for the long-term monitoring of the impact of the oil spill in Gulf.
Analyzing a water sample in the Oregon II's lab.
There are four main ways the Oregon II is gathering SEAMAP data on this cruise, and we’ve already learned how to use all of them. The main way we collect data is by trawling, and this is where we do most of our work on the Oregon II. In trawling, we drag a 42’ net along the bottom for 30 minutes, haul it up, and weigh the catch.
Hauling in the trawl net.
We then sort the haul which involves pulling out all of the shrimp and red snapper, which are the most commercially important species, and taking random samples of the rest. Then we count each species in the sample and record weights and measurements in a computer database called FSCS (Fisheries Scientific Computer System).
Logging a sample into FSCS.
Here on the
Another tool for data collection is the CTD, which stands for Conductivity, Temperature, and Depth. The CTD also measure dissolved oxygen, chlorophyll and other characteristics of the marine ecosystem and takes measurements from the surface to the bottom, creating a CTD profile of the water column at our trawling locations. These data are important to assess the extent of the hypoxic “dead zone” in the
We also use Bongos and Neustons to gather data on larval fish, especially Bluefin Tuna, Mackerel, Gray Triggerfish, and Red Snapper. The Neuston is a rectangular net that we drag along the surface for ten minutes to collect surface-dwelling larval fish that inhabit Sargassum, a type of seaweed that floats at the surface and provides critical habitat for small fish and other organisms.
Examining the results of a Neuston drag.
We drag the Bongos below the surface to collect ichthyoplankton, which are the tiny larvae of fish just after they hatch. The Neuston and Bongo data on fish larvae are used for long-term planning to maintain these important food species and keep fish stocks healthy.
This is a great learning experience, not only about marine science but also about living and working on a ship. The Oregon II is literally a well-oiled machine, and the operation of the ship and the SEAMAP study depends on a complex effort and cooperation among the science team, the crew, the officers, engineers, and the steward and cook. Everyone seems to be an expert at their job, and the success of our survey and our safety depends on that. It’s a different feeling from life on land.
Life aboard the Oregon II is comfortable, especially now that I’ve gotten my sea legs. (I was hurting after we set out on Friday in 4’ to 6’ swells, but by Saturday afternoon I felt fine.) The food is excellent and most of the ship is air conditioned. The Gulf – at least the