Influence of surfagon on rheoreaction of juvenile rainbow trout

Resumo

The rheoreaction of juvenile rainbow trout (aged 2 months) was studied 30–40 days after a single injection of surfagon (synthetic analogue of gonadotropin-releasing hormone). Individuals subjected to surfagon preferred to move against the water current both in normal and migratory state, while control (not injected) individuals preferred to move downstream. Surfagon strongly modified the rheoreaction of individuals in normal and migratory state.