Mackerel and say herring eat whatever is small enough that they can swallow it. 😁 but fun fact they have mostly same diet as say the biggest animal on earth, the blue whale,, mostly plankton and krill simple.wikipedia.org/wiki/Plankton
We are the Korean manufacturer, based in Busan, who is engaged in designing/manufacturing the fish processing line for both of land-base, or on-board fish processing plant. Please refer to the linked video ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-toLLDret0Z4.html
В 70х годах в Тихом океане, Охотском море, мы ловили кошельковым неводом скумбрию, сельдь иваси и селедку! И наше технология лова была гораздо проще, надежнее и более эффективнее!!!
I grew up in Portland Dorset in the 50s, when Mackerel were caught by 2 guys in a clinker-built rowing boat, and that was their living, fish were abundant then but now if you go feathering it is a struggle to catch a few poor specimens,
not to close to land, since they use a small boat pulling them out of the net and-ore they have side trusters. i used to be crew on a bit bigger 78 feet boat when i was young in the 1970s 1980. we didnt have side trusters but our little 18 feet tug boat with 100 hp perkins did pull hard.