Northwest Fisheries Science Center

The Main Deck

Acoustic and trawl adventures in the Northeast Pacific

This portal tracks the research and sea-going activities of the Fisheries Engineering and Acoustic Technologies (FEAT) Team from NOAA¿s Northwest Fisheries Science Center.  Follow us as we use acoustics, trawling, and oceanographic sampling to learn about the Northeast Pacific Ocean.

Back deck of Bell M. Shimada
Acoustic echogram of hake
trawl catch

Zero is a data point

By Sandy Parker-Stetter, NWFSC
January 16, 2017

No Hake
120 kHz echogram at -69 dB threshold, and not a hake to be seen

Four days of running transects…four days without a substantial hake sighting. The echogram screen capture, with a total size of 6.5 nmi across by 400 m deep, has not a hake in sight.

Many scientists and crew used the large survey map in the Acoustics Lab to vote on where they thought we would have our first confirmed hake sighting. As of now, we’ve breezed passed by 8 of those vote locations.

In the pre-cruise blog post, I mentioned that we didn’t know where the hake would be this year. We are currently south of where we found adult hake in 2016, so 2017 is a different beast. Interesting.

While the zeros (=no hake) are frustrating because we want to fish (and the Wet Lab crews are getting restless), surveys (and science in general) can work like this. You leave the dock with a survey design and sampling plan, but the hake have other ideas. If we want to understand where hake are, the zeros tell us where hake are not, so are just as important!

The search for hake continues…

Tagged: Hake, Acoustics, Winter hake research, FEAT, FRAM, Oceanography, Ecosystem, California Current Large Marine Ecosystem, CCLME, El Niño, La Niña, Climate

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July 2017
June 2017
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