You can fish in the river which runs through the valley of Hólsdalur, which extend from the fjord itself. It is not a great fishing river, but children love it and there is always some  chance to get a fish.

Angling in the Hólsá, the local river

Alternativly, you can fish in the harbor, children must then wear the life west kept in the yelow boxes located usually close the the edge a pier.