The importance of behaviour in predicting the impact of a novel small-scale hydropower device on the survival of downstream moving fish.

Highlights: [•] Impact of a small-scale hydropower device on downstream moving fish was assessed. [•] Blade strike was related to fish length, swimming speed, and blade rotational speed. [•] Strike increased and decreased for trout and eel when behaviour was considered. [•] A pinch point created by the hydropower device caused damage to euthanised fish. [•] A field study supported observations from flume experiments and blade strike models. [ABSTRACT FROM AUTHOR]