Consequences for fisheries management

Researchers: Robert Arlinghaus, Christopher Monk

Associated Researchers: Josep Alós, Arne Schröder, Shin Nakayama,  Peer Doering-Arjes  

Background: Individually variable fish behaviour is systematically related to capture probability by fishing gear. Therefore, the choice about which BT to release in stocking and reintroduction program will affect its economic and biological outcomes. In a conservation-oriented reintroduction program the sustainability of the stocking program will be greater if BT of low vulnerability to fishing are released. By contrast, in more fisheries-oriented put-and-take stocking programs releasing vulnerable BT will be advantageous.

The goal of this subproject is to investigate the implications of fish BT for the success of stocking programs in light of fundamental catch-survival trade-offs and underlying management objectives. Our main hypothesis is that BT differ in their vulnerability to fishing gear (active or passive) and we predict that releasing tame BT increases the sustainability of the stocking event by elevating survival in the wild at the cost of creating low catch-rate fisheries disliked by fishers.