Could a T90 mesh codend improve selectivity in the Belgian beam trawl fishery?

Bayse, Shannon M.; Herrmann, Bent; Lenoir, Heleen; Depestele, Jochen; Polet, Hans; Vanderperren, Els; Verschueren, Bart

doi:10.1016/j.fishres.2015.10.012

Cited by 41 publications

(43 citation statements)

References 25 publications

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“…However, the small number of Sablefish in the cover reduced the power of comparison tests for Sablefish relative to those conducted for the other three species. Our general findings of smaller mean L 50 values for flatfishes but larger means for roundfishes occurring in the 114-mm T90 cod end relative to those in the 114-mm diamond cod end are similar to previous studies that have compared diamond cod ends to T90 cod ends (Wienbeck et al 2011;Herrmann et al 2013;Tokaç et al 2014;Bayse et al 2016) and square-mesh cod ends (Wallace et al 1996;Perez-Comas et al 1998;He 2007) with similar mesh sizes.…”

Section: Improving Groundfish Trawl Catch Utilizationsupporting

confidence: 90%

“…A simple technique that has been shown to improve trawl selectivity is modifying the size and configuration of the cod end mesh (Perez-Comas et al 1998;He 2007;Madsen and Valentinsson 2010). Recent studies have focused on the development and use of T90-mesh cod ends (Digre et al 2010;Wienbeck et al 2011Wienbeck et al , 2014Madsen et al 2012;Herrmann et al 2013Herrmann et al , 2015Bayse et al 2016). The T90 mesh is conventional diamond mesh that has been turned 90°in orientation; this configuration allows the meshes over the entire cod end to remain more open than those of diamond-mesh cod ends, thereby improving size-selection characteristics (Herrmann et al 2007).…”

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confidence: 99%

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Improving Catch Utilization in the U.S. West Coast Groundfish Bottom Trawl Fishery: an Evaluation of T90‐Mesh and Diamond‐Mesh Cod Ends

et al. 2017

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The limited-entry bottom trawl fishery for groundfish along the U.S. West Coast operates under a catch share program, which is implemented with the intention of improving the economic efficiency of the fishery, maximizing fishing opportunities, and minimizing bycatch. However, stocks with low harvest guidelines have limited the ability of fishermen to maximize their catch of more abundant stocks. Size-selection characteristics of 114-mm and 140-mm T90-mesh cod ends and the traditional 114-mm diamond-mesh cod end were examined by using the covered cod end method. Selection curves and mean L 50 values (length at which fish had a 50% probability of being retained) were estimated for two flatfish species (Rex Sole Glyptocephalus zachirus and Dover Sole Microstomus pacificus) and two roundfish species (Shortspine Thornyhead Sebastolobus alascanus and Sablefish Anoplopoma fimbria). Mean L 50 values were smaller for flatfishes but larger for roundfishes in the 114-mm T90 cod end compared to the diamond-mesh cod end. For Rex Sole, Dover Sole, and Shortspine Thornyheads, selectivities of the 140-mm T90 cod end were significantly different from those of the other cod ends; the 140-mm T90 cod end was most effective at reducing the catch of smaller-sized fishes but with a considerable loss of larger-sized marketable fishes. Findings suggest that T90 cod ends have potential to improve catch utilization in this multispecies fishery.

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Section: Improving Groundfish Trawl Catch Utilizationsupporting

confidence: 90%

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confidence: 99%

Improving Catch Utilization in the U.S. West Coast Groundfish Bottom Trawl Fishery: an Evaluation of T90‐Mesh and Diamond‐Mesh Cod Ends

et al. 2017

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“…Improvements of fishing gear selectivity in multispecies fisheries remain challenging and experimental testing of various selective techniques continues in Europe (e.g. Ordines et al 2006;Sala et al 2008;Bayse et al 2016;Lövgren et al 2016;Krag et al, 2016;Vogel et al 2017).…”

Section: Introductionmentioning

confidence: 99%

“…a diamond mesh turned 90° and remaining wide open throughout the fishing process, was first introduced in the early 1990s in the Baltic Sea (Moderhak 1997). It was later tested in the Bay of Biscay (Meillat and Morandeau 2001) and in other European ecoregions (Madsen et al 2012;Tokaç et al 2014;Bayse et al 2016). Conclusions on its selective properties vary, depending on whether roundfish or flatfish species are considered (Madsen et al 2012;Herrmann et al 2013;Bayse et al 2016).…”

Section: Introductionmentioning

confidence: 99%

What can be expected of a T90 extension piece to improve selectivity in bottom trawl multispecific fisheries in the Bay of Biscay?

et al. 2018

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In the Bay of Biscay, the selective properties of otter trawls have mainly been studied with regard to single species. However, for bottom trawl multispecific fisheries targeting fish, it remains challenging to find a selective device capable of limiting catches of small individuals of several species without commercial losses. The present study focuses on an innovative technical solution to reduce catches of undersized individuals in a multispecies bottom trawl fishery in the Bay of Biscay. We tested a cylinder made of 100-mm diamond meshes turned at 90°, namely T90 inserted in the extension piece. We present the selectivity results obtained for six commercial species. This device allows the escape of small Solea solea, Trachurus trachurus and Spondyliosoma cantharus individuals. No commercial losses of Sepia officinalis were recorded. Patterns for Dicentrarchus labrax and Mullus surmuletus require further investigation due to limited fish size ranges in the dataset.

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“…However, these gears have well-known disadvantages, such as high fuel consumption (Poos et al 2013) and seabed disturbance (Lindeboom and de Groot 1998), resulting from their intense bottom contact . Another important disadvantage is that beam trawling is a mixed fishery with poor selectivity, which results in high bycatch rates (Kaiser and Spencer 1995;Depestele et al 2014;Bayse et al 2016). Most of these mainly undersized fish and nonmarketable species are subsequently discarded.…”

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confidence: 99%

Laboratory Study of the Impact of Repetitive Electrical and Mechanical Stimulation on Brown Shrimp Crangon crangon

Soetaert

Verschueren²,

Chiers

et al. 2016

Mar Coast Fish

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Pulse trawling is currently the best available alternative to beam trawling in the brown shrimp Crangon crangon and Sole Solea solea (also known as Solea vulgaris) fisheries. To evaluate the effect of repetitive exposure to electrical fields, brown shrimp were exposed to the commercial electrodes and pulse settings used to catch brown shrimp (shrimp startle pulse) or Sole (Sole cramp pulse) 20 times in 4 d and monitored for up to 14 d after the first exposure. Survival, egg loss, molting, and the degree of intranuclear bacilliform virus (IBV) infection were evaluated and compared with those in stressed but not electrically exposed (procedural control) and nonstressed, nonexposed (control) brown shrimp as well as brown shrimp exposed to mechanical stimuli. The lowest survival at 14 d (57.3%) occurred in the Sole cramp pulse treatment, and this was significantly lower than in the group with the highest survival, the procedural control (70.3%). No effect of electrical stimulation on the severity of IBV infection was found. The lowest percentage of molts occurred in the repetitive mechanical stimulation treatment (14.0%), and this was significantly lower than in the group with the highest percentage of molts, the procedural control (21.7%). Additionally, the mechanically stimulated brown shrimp that died during the experiment had a significantly larger size than the surviving individuals. Finally, no effect of the shrimp startle pulse was found. Therefore, it can be concluded that repetitive exposure to a cramp stimulus and mechanical stimulation may have negative effects on the growth and/or survival of brown shrimp. However, there is no evidence that electrical stimulation during electrotrawls would have a larger negative impact on brown shrimp stocks than mechanical stimulation during conventional beam trawling.Received November 15, 2015; accepted May 16, 2016

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Could a T90 mesh codend improve selectivity in the Belgian beam trawl fishery?

Cited by 41 publications

References 25 publications

Improving Catch Utilization in the U.S. West Coast Groundfish Bottom Trawl Fishery: an Evaluation of T90‐Mesh and Diamond‐Mesh Cod Ends

Improving Catch Utilization in the U.S. West Coast Groundfish Bottom Trawl Fishery: an Evaluation of T90‐Mesh and Diamond‐Mesh Cod Ends

What can be expected of a T90 extension piece to improve selectivity in bottom trawl multispecific fisheries in the Bay of Biscay?

Laboratory Study of the Impact of Repetitive Electrical and Mechanical Stimulation on Brown Shrimp Crangon crangon

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