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

Evidence of spawning

By Sandy Parker-Stetter, NWFSC
February 9, 2017

During a trawl offshore of San Francisco, where the seafloor was at a depth of ~3800 m, we finally caught female hake that showed signs of having spawned. Score! These may not be the females that co-produced the larvae that we caught in the bongo net (we are 290 nmi north of that spot now), but it’s still exciting.

wet lab
Night wet lab crew prepares to process the trawl. Credit Parker-Stetter, NWFSC

Unlike the full ovary shown in the previous post, the ovaries from these females were not full. They were loose, baggy, deflated. Interestingly, they do still contain lots of eggs that are developing, likely for an upcoming spawning event. Ovaries from these females were collected and are unique among our samples – we haven’t seen any other females (or males for that matter) that showed evidence of recent spawning. The histological analysis of these samples is going to be so interesting and increase our understanding about hake biology and reproduction.

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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