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Effects of Mesh Configuration on the Selectivity of Demersal Trawl Codends for Nephrops Norvegicus (Linnaeus, 1758) (Decapoda, Nephrophidae)

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In the present study, we have compared the selectivity of a diamond mesh codend (40D), currently used by Turkish trawl fishermen, and a square mesh codend (40S), which is in the legislation for EU Mediterranean countries (EC 1967/2006). Trawling was carried out onboard the commercial trawler “Niyazi Reis” in the international waters between Turkey and Greece, at depths ranging from 158 to 264 m, in August 2005. Selectivity data were obtained by using the covered codend technique. Selection parameters were estimated by fitting a logistic equation using the maximum likelihood method.

Nephrops norvegicus escaped from the codends with retention ratios of 0.98 and 0.91 for 40D and 40S codends, respectively. The selection curves of the two codends are found to be significantly different (p < 0.01). For combined sexes, L 50 values of 16.03 (s.e. 0.41) and 19.38 mm (s.e. 0.51) were estimated in 40D and 40S codends, respectively. The results of this study clearly demonstrate that N. norvegicus took advantage of the increase in escape area provided by the change in mesh configuration from diamond to square. Dans cette étude, nous avons comparé la sélectivité du cul de chalut à maille diamant (40D), actuellement utilisé par les pêcheurs turcs, et du cul de chalut à maille carrée (40S), qui est dans la législation concernant les pays méditerranéens de l'UE (EC 1967/2006). Le chalutage a été mené à bord du chalutier commercial "Niyazi Reis" dans les eaux internationales entre la Turquie et la Grèce, à des profondeurs de 158 à 264 m, en Août 2005. Les mesures de sélectivité ont été obtenues par la technique du cul de chalut couvert. Les paramètres de sélection ont été estimés en appliquant une équation logistique utilisant la méthode du maximum de vraisemblance.

Nephrops norvegicus s'échappait des culs de chalut avec des taux de rétention de 0,98 et 0,91 pour les culs de chalut 40D et 40S, respectivement. Les courbes de sélection des deux culs de chalut étaient significativement différents (p < 0.01). Pour les deux sexes ensemble, les valeurs de L 50 de 16,03 (s.e. 0,41) et 19,38 mm (s.e. 0,51) ont été estimés, pour, respectivement, les culs de chalut 40D et 40S. Les résultats de cette étude démontrent clairement que N. norvegicus tire avantage par l'augmentation de sa capacité d'échappement, induite par le changement de la structure de la maille, de diamant à carrée.

Affiliations: 1: Fisheries Faculty, Ege University, TR-35100 Bornova, Izmir, Turkey;, Email:; 2: Fisheries Faculty, Mersin University, Yenişehir Campus, TR-33169 Mersin, Turkey; 3: Fisheries Faculty, Ege University, TR-35100 Bornova, Izmir, Turkey


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