The Fishermen are minor antagonists in Finding Nemo.
The fishermen appear at the end of the film, as they try to fish tons of fish out of the water by using a huge net. Coincidentally, Dory also ends up being trapped in the same net. Marlin, Dory, and Nemo tell all the the fish to swim down (a technique Nemo has learned from the Tank Gang on how to escape from being caught) and they do so, causing the boat to tip over. Eventually, with all the force of the fish pulling on the net, the beam attached to the net finally breaks, freeing Dory and all the fish. The fishermen, therefore, is unable to capture the fish.