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.
Two days into the winter hake survey and we found our first adult Pacific hake. We were ~75 miles offshore, near Coos Bay, OR, when we noticed a new pattern on the acoustics. We fished the aggregation using our midwater trawl and confirmed that it was hake. Score! These hake were found over 3,000 m bottom depth, much further offshore than we see them during our usual summer surveys. The catch was 99.1% hake, so a very clean catch.
We used the acoustics to identify the hake we fished. Our systems are like high-tech versions of fish finders. The acoustic “echogram,” shown below for our 38 kHz unit (we have 18, 38, 70, 120, and 200 kHz), gives us many pieces of information:
Photo credit Sandy Parker-Stetter
Using the echograms, we can decide if we think these are hake, if we think there are enough to catch with the trawl, and where we need to put the midwater trawl to catch them. For this survey, the most important job in the acoustics lab is to watch the acoustic echograms to identify targets for fishing – and hopefully we’ll see more aggregations like this and find more hake!
Tagged: Winter hake survey