NOAA Teacher at Sea Log: Deborah Moraga
NOAA Ship: Fulmar
Date: July 20‐28, 2010
(Applied California Current Ecosystem Studies)
Geographical area of cruise: Cordell Bank, Gulf of the Farallones and Monterey Bay National Marine Sanctuaries
Date: June 27,2010
Weather Data from the Bridge
Start Time: 0700 (7:00 am)
End Time: 1600 (4:00 pm)
Line 10 start on western end: Latitude = 37o 20.6852 N; Longitude = 122o 56.5215 W
Line 10 end on eastern end: Latitude = 37 o 21.3466 N; Longitude = 122o 27.5634 W
Present Weather: Started with full could cover and cleared to no cloud cover by mid day
Visibility: greater than 10 nautical miles
Wind Speed: 5 knots
Wave Height: 0.5 meters
Sea Water Temp: 14.72 C
Air Temperature: Dry bulb = 14 C Barometric Pressure: 1013.2 mb
Science and Technology Log
We left Half Moon Bay at 0700 (7:00 am) to survey line 10. We traveled out to about 30 miles offshore then deployed the Tucker trawl.
When the team deploys the Tucker trawl the goal is to collect krill. They are relying on the echo‐sounder to determine where the krill are located in the water column. The echo‐sounder sends out sound waves that bounce off objects in the water and works much like a sophisticated fish finder. Dolphins hunt for their prey in much the same way. A computer connected to the echo‐sounder is used to display the image of the water column as the sound waves travel back to the boat. By reading the colors on the screen the team can determine the depth of krill.
The scientists send weights (called messengers) down a cable that is attached to the Tucker trawl as it is towed behind the boat. Once the messenger reaches the end of the line where the net is located, it triggers one of the three nets to close. Triggering the nets this way allows for the researchers to sample zooplankton at three different depths.
• Thysanoessa spinifera – a species of krill
• Crab megalopa larvae
Euphausia pacifica – a species of krill