Archive for July, 2009

North array at Lime Kiln


David Howitt and Jason deployed hydrophone 2 and 1 in the North array today at around 2:00 pm.  We moved the last two tires into place and placed another tire at the end of the cable protector to hold it in place.  During the dive we resurveyed the original placements so that we had measurements from a single dive.  The data collected are as follows:

Each tire is ~ 8 meters apart

Bearing along coast line: 330 degrees

#4 hydrophone 30 feet depth.

Bearing from #4 to #3 is 280 degrees

#3 hydrophone 35 feet depth.

Bearing from #3 to #2 is 250 degrees

#2 hydrophone 44 feet depth.

Bearing from #2 to #1 is 220 degrees.

#1 hydrophone 57 feet depth.

Read More

Vemco VR2 at False Bay

On 6/27/09 Val and Jason deployed another Vemco fish receiver at the mouth of False Bay in a depth of 26 feet at 14:22 (should have been ~ 0.16 tide at the time).  The location was 48 degrees 28.748 N and 123 degrees 04.411.  This location is just off the small island in the mouth of the bay.  The serial number of the unit is 100910.

While we were there, a boat with a banner reading ‘Fish Research’ was also present.  In  talking to them, they told us they were in the process of removing old derelict fishing gear.  The name of the vessel was Bet-Sea and had the numbers 785 and 53661 on it.  We also spotted this same vessel off False Bay during the Spring 09 quarter.

Read More

Sonic Gloom podcast

I enjoyed this ~20minute documentary by CBC science reporter Monica Kid on noise pollution in the ocean. It provides a synthesis and synopsis of many of the inter-linked issues — from Navy LFA sonar and seismic air guns to boats and ships — with interviews with Arthur Popper, Alexandra Morton, Ken Balcomb, Michael Jasny, and Douglas Wartzoff.

Sonic Gloom podcast (mp3)

I was particularly interested to hear about some of the potential impacts of noise on fish. It was also interesting to hear from Alexandra about the avoidance of seal harassment devices by resident killer whales in the Broughton Archipelago (2/3 drop in sighting rate) and from Ken about the Bahama strandings.

Thanks to Michael Darling of the Seattle Aquarium for letting me know about this nice piece (high-lighted on “and-the-winner-is” show).

Read More