Understanding size selectivity of trawls using structural models: Methodology and a case study on fish sorting grids

Jacques, Nadine; Herrmann, Bent; Brinkhof, Jesse; Sistiaga, Manu

doi:10.1016/j.aaf.2024.03.003

Aquaculture and Fisheries

2024

DOI: 10.1016/j.aaf.2024.03.003

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Understanding size selectivity of trawls using structural models: Methodology and a case study on fish sorting grids

Nadine Jacques,

Bent Herrmann,

Jesse Brinkhof

et al.

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Observing fish behavior in towed fishing gear—is there an influence of artificial light?

Brinkhof,

Sistiaga,

Herrmann

et al. 2024

Rev Fish Biol Fisheries

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Fish behavior is important to consider when developing selective fishing gear. In studies designed to investigate the size selective properties of towed fishing gears such as trawls, fish behavior is mainly documented by underwater video recordings. Because fishing gear can be operated at great depths or in other low light environments, artificial light is often required for underwater recordings. However, artificial light can influence fish behavior, which casts doubt on the validity of behavioral observations obtained in the presence of artificial light. However, removing artificial light disables video recordings and the possibility to study fish behavior in relation to selectivity devices towed fishing gears in low light environments. To date, little is known about the extent to which artificial light used for video observations affects fish behavior with respect to fishing gear. Therefore, we conducted fishing trials in the Barents Sea demersal trawl fishery to assess the effect of light sources on fish behavior by using size selectivity results in towed fishing gears. We found that the behavior of cod (Gadus morhua) was unaffected by the light sources, whereas the behavior of haddock (Melanogrammus aeglefinus), saithe (Pollachius virens) and redfish (Sebastes spp.) significantly changed when red light and white light were employed. Our results also demonstrated significant differences in fish behavior between white and red light.

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Observing fish behavior in towed fishing gear—is there an influence of artificial light?

Brinkhof,

Sistiaga,

Herrmann

et al. 2024

Rev Fish Biol Fisheries

View full text Add to dashboard Cite

show abstract

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Understanding size selectivity of trawls using structural models: Methodology and a case study on fish sorting grids

Cited by 1 publication

References 58 publications

Observing fish behavior in towed fishing gear—is there an influence of artificial light?

Observing fish behavior in towed fishing gear—is there an influence of artificial light?

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