The invention relates to a fishing system (102), a fish processing line (18, 22) and/or vessel (2) provided therewith, and a method (26) therefor. The fishing system (102) according to the invention comprises a fishing net (6) for catching shrimps or fish; transfer means (14, 15, 16) connected operatively to the fishing net (6) for bringing on board the caught shrimps or fish; an automatic detection device (18) configured to detect, classify and if desired sort the shrimps or fish brought on board; a registration system (104) connected operatively to the detection device (18) and configured to receive, store and read and/or transmit data (108) obtained with the detection device (18) about the shrimps or fish brought on board, wherein the data (108) comprise information about the quantity, classification and location of the caught shrimps or fish.