May and April are top season for herring fishing at the lock in Hvide Sande. The herring flock through the lock to get into the fjord to spawn, this creating a bottleneck where the fish concentrate and are easy for anglers to catch. 
Herring are caught with a snell (forfang in Danish) which is available from the local sports shops. Herring fishing is a cheap and family-friendly activity where everybody can participate, and the chance of a catch for dinner is almost guaranteed.