Archive for April 23rd, 2008

Snug Harbor to Snug Harbor

We left Snug with a series of science goals for the day. We headed south on the ebb tide towards Lime Kiln. On the way there and back we deployed the Biosonics 200 kHz echosounder for the first time. This marks our first forays into using active acoustics. We got so excited that we even lowered a video camera under water to see if the objects we were interpreting as fish and eel grass really were fish and eel grass. We did see a few fish, but for sure the eel grass we saw on the echosounder was real eel grass. We also figured out how we would deploy the hydrophone array along with a high frequency hydrophone. Because some of the student projects involve high frequency clicks, we needed to add a hydrophone with a high frequency response. We figured out a new configuration that would allow us to do that with the regular linear array on the port stern and the single high frequency hydrophone on the starboard stern. After dinner we had our journal club discussion about an article on prey species of Northern and Southern Resident killer whales. All in all a productive science day.

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Students set sail

On Monday of this week the Spring 08 Beam Reach program set sail on the Gato Verde. They’ve been all over the west side of the San Juan Islands including False Bay and Snug Harbor. I’ve gotten several emails and as of Tuesday they hadn’t seen the whales. I hope they are getting to use the tools from Biosonics to check out the salmon. I’m sure they are seeing plenty of other interesting sea life. I’ll post an update once I get more details.

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