Elizabeth Eubanks, July 31, 2007

NOAA Teacher at Sea
Elizabeth Eubanks
Onboard NOAA Ship David Starr Jordan
July 22 – August 3, 2007

Mission: Relative Shark Abundance Survey and J vs. Circle Hook Comparison
Geographical Area: Pacific Ocean, West of San Diego
Date: July 31, 2007

Weather Data from the Bridge 
Visibility: 10 miles
Air temperature: 16.0 degrees C
Sea Temperature at 700m: 5 degrees C
Sea Temperature at surface: 19.2 degrees C
Wind Direction: 300 W
Wind Speed:  15 kts
Cloud cover: Clear –stratus
Sea Level Pressure: 1013.9 MB
Sea Wave Height: 4-5 ft
Swell Wave Height: 2 ft

Science and Technology Log 

Salt, Sodium, NaCl, Salinity. How much salt is in the ocean? How much salt is in me and you? Is there a difference between the amount of salt in from the Pacific to the Atlantic ocean? How much salt is in a fish or shark? Lots of questions about salt. I spent some time again with Dr. Jeff Graham and he showed me some nice diagrams to help me understand.

Percent of average salt content – salinity. ***The top of the box marks only 10%   scale subject to revision (due to lack of resources on board ship)
Percent of average salt content – salinity. The top of the box marks only 10% scale subject to revision (due to lack of resources on board ship)

Personal Log 

Yeah I added a new species to my list and yesterday I was able to get a photo of the Black Footed Albatross. While we were hauling our line he kept circling. He seemed to be very interested in the line. Some of the scientists were tossing bait to him from the hooks they were debating, but he didn’t seem that interested our old Mackerel.  Albatross are beautiful birds. They are the largest of seabirds and spend most of their time on the water. They have long, narrow wings as you can see from the photo below. One of the scientists on board was telling me that she read studies, indicating that they can travel 3,000 miles across the ocean, before they need to touch land.  Rarely does a person have the opportunity to view them from shore unless you are on some remote island when they are breading and nesting.

Black-footed albatross, tagged.
Black-footed albatross, tagged.

Look at the photo I took. You will notice a yellow band on left leg and a white one oh his right. I am told that to band these birds, you go to a remote island and just band them. They aren’t really afraid of people. – I would love to do that…. When is that cruise?  Nobody likes it when this happens, especially the sea lions. This is the only we caught this trip. They put up a huge fight and this one actually got off of the line. Hopefully, he will be fine. It is such a treat to see them out here. During this set we had a lot of half eaten bait, so we believe he was having a feast!

Steller sea lion hooked in the mouth
Steller sea lion hooked in the mouth

Question of the Day 

Salt is essential for all life. However too much salt can be toxic. Animals have special ways of regulating the salt in their bodies. How does the shark regulate its salt? Define these terms associated with salinity and adaptations an animal makes to an environment: Isosmotic,  Hypoosmotic, and  Hyperosmotic.

Question of the trip: Which hook, the J or Circle, will catch more sharks?

Please make a hypothesis. Utilize resources to justify your hypothesis. ———Yes, you get extra credit for this.  

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