Except for the eastern end at 5.45 east – with some young herring - it seemed that the 55.41N transect is just as empty as the the 56.11N transect.
However, at Ingeborgs watch “light” schools at the bottom started to appear. At first we decided to wait a little and save time for more substantial recordings, but after lunch we had to satisfy our (fisheries-)scientific hunger. We shot the trawl at 11:00 UTC 55.44N – 0.26E. The catch consisted of 900 kg of mackerel. With hindsight this was not so surprising as the schools showed up relatively strong on the 200 kHz echogram (upper – right in the picture). Mackerel is a fish species without a gas filled swimbladder. Species with swimbladder like herring, show up relatively strong on the lower frequencies, like the 38 kHz (left in the picture).