Fishing is possible at the park. You always need a fishing license for this. You can get this from:
VVV Giethoorn
Eendrachtsplein 2
8355DL Giethoorn
Raven Hengelsport
Woldmeentherand 11a
8332JE Steenwijk
You can also get a fishing rod at Raven Sport in Steenwijk.