Surface herring

In the afternoon of July 5^th we encountered a couple more situations to take a trawl sample. Firstly there were distinct marks very high in the water column between 15-30m depth. Observing the trawl sonar during the targeted surface trawl suggested that nothing entered the net. However, the catch revealed nearly 2 tons of herring, measuring between 23-30 cm.

The echogram shows the surface marks in the upper section of the water column. 

 

 These marks were also nicely visible on the 3D image from the multibeam data:

 
Further towards the east on our northernmost transect, more marks started to appear along the seabed. The following catch consisted of several tons of clean herring:

Some impressions from the trawl activities and subsequent preparations of the first maatjes onboard this year…