Effect of shortening the length of codend on brushtooth lizardfish caught in square mesh codend of otter trawl in Eastern Mediterranean

Demirci, Sevil; Dogru, Zubeyir; Şimşek, Emrah

doi:10.21077/ijf.2017.64.3.71048-05

Cited by 5 publications

(2 citation statements)

References 9 publications

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“…The significantly lower catch efficiency of DM50 compared to SM40, observed in both the catch comparisons and the exploitation pattern indicators, for the two flatfish species (Mediterranean scaldfish and spotted flounder) is in accordance with what found in the literature [ 51 , 63 , 64 ]. In fact, the flat morphology of these species fits better to the diamond-shaped meshes than to the square-shaped meshes [ 65 ].…”

Section: Discussionsupporting

confidence: 91%

Every animal matters! Evaluating the selectivity of a Mediterranean bottom trawl fishery from a species community perspective

et al. 2023

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Bottom trawl fisheries often catch several species simultaneously. However, most studies addressing the catch performance and selectivity of a specific trawl focus on a few commercially important or most vulnerable species requiring management measures. By contrast, the present study considers the multispecies nature of Mediterranean bottom trawl fisheries through a holistic approach that accounts for the full species community in the catches. Specifically, we evaluated and compared the catch performance of the two codends allowed for this fishery, made of 40 mm square (SM40) and 50 mm diamond (DM50) meshes. Results showed that 50 and 80% of the catch in weight and count numbers, respectively, consisted of species without commercial value, demonstrating that large proportions of the catch are not considered when using the existing approach to evaluate the ecological impact of the fishing activity. Significant differences in catch profiles between the two codends were observed, especially for two commercial flatfish species, Arnoglossus laterna and Citharus linguatula, with larger contributions in the SM40. Further, the SM40 codend had a significantly higher retention, compared to DM50 codend, for specific sizes of Merluccius merluccius and Mullus barbatus. The outcomes of the study can be useful for the Mediterranean bottom trawl fisheries management.

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Section: Discussionsupporting

confidence: 91%

Every animal matters! Evaluating the selectivity of a Mediterranean bottom trawl fishery from a species community perspective

et al. 2023

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“…Frandsen et al [8] studied selectivity and escapement behaviour of five commercial fishery species in standard square and diamond mesh codends. Demirci et al researched the negative effect of an additional protective cover surrounding the codend on selectivity [9].…”

Section: Introductionmentioning

confidence: 99%

The Use of a Double Bottom Trawl Set to Assess the Selectivity of Innovative Codends in Baltic Cod (Gadus morhua) Fishing

Zalewski,

Nowakowski,

Berest

et al. 2024

Applied Sciences

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The overall objective of the study presented in this paper was to evaluate the selectivity properties of three innovative codends in Baltic cod fishing: (1) an ultracross codend of 120 mm square mesh, (2) an ultracross codend with additional devices reducing the speed of water flow—one tarpaulin diffuser and one net confusor of 120 mm mesh, and (3) an ultracross codend with two tarpaulin diffusers and two net confusors of 120 mm mesh. These codends were firstly tested at sea by single trawls and compared to T90 and herring codend trawls, allowing assessment of caught fish mass and dimensions. Additionally, a special divided small-mesh coat for the innovative codends enabled determination of the amount as well as the length and mass of cod escaping from the codend both while the trawling gear was towed and while it was hauled. Further validation of codend selectivity was carried out by a double (twin) bottom trawl set deployed from one cutter in various variants of innovative codends compared to standard ones. The results of the study indicate that the use of an innovative ultracross codend and innovative devices reducing the water flow speed (tarpaulin diffusers and 120 mm net confusors) significantly reduces the number of undersized cod (<35 cm), even down to 1.3%, in the haul and contributes to a reduction in invisible mortal discard.

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A review of bycatch reduction in demersal fish trawls

Kennelly

Broadhurst

2021

Rev Fish Biol Fisheries

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Effect of shortening the length of codend on brushtooth lizardfish caught in square mesh codend of otter trawl in Eastern Mediterranean

Cited by 5 publications

References 9 publications

Every animal matters! Evaluating the selectivity of a Mediterranean bottom trawl fishery from a species community perspective

Every animal matters! Evaluating the selectivity of a Mediterranean bottom trawl fishery from a species community perspective

The Use of a Double Bottom Trawl Set to Assess the Selectivity of Innovative Codends in Baltic Cod (Gadus morhua) Fishing

A review of bycatch reduction in demersal fish trawls

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