Advisor(s)
Abstract(s)
A repulsive effect, that some induced primary stimuli, like sound and light, is known to be
provoked in fish behavior. In the present study, two strobe light frequencies, 350 flashes/minute and
600 flashes/minute, were tested in laboratorial conditions, using three native freshwater fish species
of northern Portugal: Brown trout (Salmo trutta), Northern straight-mouth nase (Pseudochondrostoma
duriense) and Iberian barbel (Luciobarbus bocagei). The results showed a differential repulsive behavior
of the fish species to light stimulus, and particularly to a frequency of 600 flashes/minute. S. trutta
presented the most repulsive behavior, whereas the L. bocagei showed less repulsion to the light
stimulus. No relevant differences were found between pre-test and post-assessments, confirming a
rapid recovery of natural fish behavior after the deterrent effect. The results highlighted the potential
of behavioral barriers, particularly in salmonid streams, based on strobe light stimulus.
Description
Keywords
Behavioral barriers Brown trout Deterrent effect Endemic cyprinids Underwater light
Citation
Jesus, Joaquim; Teixeira, Amílcar; Natário, Silvestre; Cortes, Rui (2019). Repulsive effect of stroboscopic light barriers on native salmonid (Salmo trutta) and cyprinid (Pseudochondrostoma duriense and Luciobarbus bocagei) species of iberia. Sustainability. ISSN 2071-1050. 11, p. 1-11