Fisherdwarves catch fish from available water sources: ponds, brooks, rivers, lakes and the ocean. The higher the fisherdwarf skill, the faster they catch fish. Unfortunately they also deplete the stocks of fish in the water faster. If no fish are immediately available from a bank, they will often refuse to start the 'fish' job. This can be fixed by designating an Activity zone for fishing.
The fisherdwarf's nemesis is the deadly, deadly carp.