Repulsive Effect of Stroboscopic Light Barriers on Native Salmonid ( Salmo trutta ) and Cyprinid ( Pseudochondrostoma duriense and Luciobarbus bocagei ) Species of Iberia

Joaquim Jesus, Amílcar Teixeira, Silvestre Natário and Rui Cortes
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Joaquim Jesus: CITAB, Centre for the Research and Tecnhology of Agro-Environmental and Biological Sciences, University of Trás-os-Montes e Alto Douro, Quinta dos Prados, 5000-911 Vila-Real, Portugal
Amílcar Teixeira: Centro de Investigação de Montanha (CIMO), Instituto Politécnico de Bragança, Campus de Santa Apolónia, 5300-253 Bragança, Portugal
Silvestre Natário: OriginAL Solutions, Estrada do Cando, Casa da Fraga, 5400-010 Chaves, Portugal
Rui Cortes: CITAB, Centre for the Research and Tecnhology of Agro-Environmental and Biological Sciences, University of Trás-os-Montes e Alto Douro, Quinta dos Prados, 5000-911 Vila-Real, Portugal

Sustainability, 2019, vol. 11, issue 5, 1-11

Abstract: 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.

Keywords: underwater light; behavioral barriers; brown trout; endemic cyprinids; deterrent effect (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2019
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