This attachment goes on the end of a large in diameter hose. It gets lowered into the water over the side of the boat to suck the herring out of the net and into the hold of the boat where the fish is refrigerated in cold water to keep it fresh and the best possible product it can be for packing.
Submersible Herring Pump Attachment, originally uploaded by captjoe06.
Good Morning Gloucester 
Thanks Joey. I’ve been curious about the actual method of getting the fish out of those huge nets for quite a while, and now I have the answer.
LikeLike