Beth Spear, August 4, 2010


NOAA Teacher at Sea: Beth A Spear
NOAA Ship: Delaware II

Mission: Shark – Red Snapper Bottom Long Line Survey
Geographical area of cruise: Gulf of Mexico to North Atlantic
Date: Wednesday, August 4, 2010

Night Watch

Weather Data from the Bridge
Time: 0200 (2:00 am)
Position: Latitude 29 degrees 28’N, Longitude 080 degrees 21’W
Present Weather: Partly Cloudy
Visibility: 10 nautical miles
Wind Speed: 8 knots
Wave Height: 1 foot
Sea Water Temp: 30.2 degrees C
Air Temperature: Dry bulb = 28.2 degrees C; Wet bulb = 26.0 degrees C
Barometric Pressure: 1016.8 mb
View off the stern off the NOAA Delaware II
View off the stern off the NOAA Delaware II

Science and Technology Log
This NOAA cruise was conducted for Red Snapper and sharks. Sampling is conducted along the continental shelf with a bottom longline. The longline consists of a mainline that is about 1 nautical mile or 6000 feet. Gangions are clamped to the main line approximately every 60 feet. The gangions have a clamp at one end and a hook baited with Atlantic Mackerel at the other end. The mainline is weighted at both ends and in the middle to keep it near the bottom. The line is set at depths ranging from 5 – 30 fathoms or 30 – 100 fathoms. The long term objective of the study is to estimate abundance of certain fish species. (mention annual survey, temporal patterns) Some short term objectives include sampling for genetic studies and tagging to study movement, age, and growth. Species studied usually include red snapper, tile fish, grouper, and various sharks.

The longline being sent out.
The longline being sent out.
Personal Log
Yesterday I began my night watch duties. Getting up at midnight is pretty tough especially when my normal bedtime is around 11:00 PM. One benefit however is the cooler early morning hours. We have about 4 -5 hot sunny hours before the night watch ends at noon. There is some down time while steaming to the next line. But when we are busy it can get crazy, especially working around animals with teeth that like to flip around. NOAA is very safety conscious and we all wear personal flotation devices (PFDs), safety glasses, and hard hats. The first night we had the mainline snap while hauling in the catch. No one was hurt, but that’s what the safety gear is for. It’ll be a good reminder for my students to wear their safety gear during labs.
Animals Seen So Far
Blue fish
Brittle star (see photo below)
Mahi Mahi
Flying fish
Scalloped hammerhead shark
Atlantic sharpnose shark
Blacknose shark
Eel
Sandbar shark
Bat?
Brittle star
Brittle star

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