For those new with us, you can buy a fishing net (2 crowns at a fishmonger, also for sale in shops) and go out onto a river. Drop the net and see if you can catch a fish. If you do start hauling in a net full of fish, get all.fish net.
The fishmonger previously used to pay 10 coppers per fish, but he's now been changed to have a 50% of 10 copper and 50% of 20 copper, e.g. a gold crown. This might help newbies a little in a quiet little activity. Please note, however, that you can still get killed on water.