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Vessel Avoidance Response: A Complex Tradeoff Between Fish Multisensory Integration and Environmental Variables 5
Brehmer, Patrice; Sarré, Abdoulaye; Guennegan, Yvon; Guillard, Jean.
The avoidance reaction by fish in front of an approaching vessel is a major source of bias in direct biomass assessment and ecological studies based on fisheries acoustics data. An experiment was carried out to compare echosounder data obtained using a small speedboat and a research fisheries vessel generating significant higher noise above conventional reduced-noise standard. The results show that there was no significant difference between the individual fish target strength distributions, and the numbers of schools recorded by both boats, these schools having similar areas and perimeters. However, the schools detected by the noisier vessel were significantly deeper, and unexpectedly had a significantly higher energy level. These findings suggest that...
Tipo: Text Palavras-chave: Vessel avoidance; Fish behavior; Fisheries acoustics; Small pelagic assessment; Fish school; Boat noise.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00487/59906/63102.pdf
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