The effect of forced mesh opening in the upper panel of a Nephrops trawl on size selection of Nephrops, haddock and whiting

Ingólfsson, Ólafur Arnar

doi:10.1016/j.fishres.2010.11.024

Cited by 4 publications

(2 citation statements)

References 14 publications

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“…However, the retained number of juvenile fish in a shrimp trawl in the northeastern United States was similar between a rope grid BRD and traditional cod end (He and Balzano, 2013). Most of the BRD trials have reported a reduction in the juvenile fish discard, but no reports to date have described the decrease in garbage discard (Deval et al, 2006;Ingólfsson et al, 2011). However, the experimental shaking cod end in this study demonstrated a reduction in juvenile catch, as well as filtering of garbage by the active motion of shaking generated by the round canvas.…”

Section: Resultsmentioning

confidence: 93%

“…The size of the caught fish has mostly been controlled by mesh size and mesh opening, such as hanging ratio, including square mesh or grid interval as modification of the fishing gear (Chopin and Suuronen, 2009). Numerous studies have been carried out on bycatch reduction devices (BRDs) according to gear type, locality, species focused on selectivity, separating unwanted species, and preventing the catch of specific animals (Matsushita, 2000;Ryer, 2008;Ingólfsson, 2011). As a result, bycatch reduction by BRD has gained importance, and some countries have adopted BRDs as compulsory regulation for specific gear and species.…”

Section: Introductionmentioning

confidence: 99%

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Effects on bycatch reduction in a shaking cod end generated by canvas in a shrimp beam trawl

Kim¹,

Whang²

2014

Journal of the Korean society of Fisheries Technology

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An active stimulating device, such as a fluttering net or canvas attached to the end of a cod end generating a shaking motion, could help to encourage the escape of juvenile fish positioned passively near the net. Field fishing trials using a shrimp beam trawl were carried out to examine the effect on the reduction of juvenile fish or other discard catch by generating a shaking movement of the cod end using an unbiased cap-like round canvas. The mean period of the shaking motion with the round canvas was -14 s, and the mean amplitude was 0.4 m as measured by peak event analysis and the global wavelet method. The bycatch of juvenile fish in 14 trials decreased by -30% and by -25% using a steady cod end for the total bycatch using a shaking cod end in the shrimp beam trawl, while the marketing catch was similar between steady and shaking cod ends. There was no difference in the body size of the shrimp or fish and species composition between the steady and shaking cod ends. Above results demonstrate a new method for bycatch reduction using an active stimulating device, although more detailed studies are needed.

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Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%