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Selectivity of Double and Single Codends for the Deep-Water Rose Shrimp, Parapenaeus Longirostris (Lucas, 1846) (Decapoda, Penaeidae) in the Aegean Sea Trawl Fishery

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This study investigates the differences in selectivity of commercially used 44 mm mesh size single and double codends for the deep-water rose shrimp, Parapenaeus longirostris by using the covered codend method. Experiments were conducted on the commercial fishing grounds of Kuşadası Bay and Sığacık Bay of the eastern Aegean Sea, between 3 and 27 October 2007. Twenty-four hauls were carried out, eleven with single and thirteen with double codends. The mean fifty-percent retention length (L 50) values of double and single codends were found to be 12.0 ± 0.09 and 16.9 ± 0.08 mm, respectively. Selection range (SR) values for double and single codends were 4.0 ± 0.05 and 5.9 ± 0.09 mm, respectively. Significant differences were found between L 50 and selection factor (SF) values of double and single codends (p < 0.05) for the deep-water rose shrimp. However, towing duration and catch size did not have any significant effect on these parameters (p > 0.05). This work shows that the use of 44 mm mesh size knotless polyethylene (PE) diamond mesh codends is by itself destructive for immature shrimp. The use of narrower netting around it to establish a double codend further decreases the already insufficient selectivity for this species. Cette étude examine les différences de sélectivité des culs de chalut commerciaux de 44 mm de vide de maille et à double cul pour la pêche commerciale de la crevette rose d'eaux profondes Parapenaeus longirostris, testée par la méthode du cul de chalut couvert. Les expérimentations ont été réalisées sur les zones de pêche commerciale de la baie de Kuşadası et de la baie de Sığacık dans l'est de la mer Égée, entre le 3 et le 27 octobre 2007. Vingt-quatre chalutages ont été effectués, onze en simple et treize en double culs de chalut. Les valeurs moyennes de 50% de rétention (L 50) pour le double et le simple cul de chalut sont de 12,0 ± 0,09 et 16,9 ± 0,08 mm de long, respectivement. Les valeurs du facteur de sélection (SR) étaient de 4,0 ± 0,05 et 5,9 ± 0,09 mm, respectivement. Des différences significatives ont été trouvées entre les valeurs de L 50 et du facteur de sélection (SF) des simples et doubles culs de chalut pour la crevette rose profonde. Cependant, la durée du chalutage et la taille de la prise n'affectent pas significativement ces paramètres (p > 0,05). Ce travail montre que l'utilisation des culs de chalut à maille diamant en polyéthylène de 44 mm (PE) sans nœud est en lui-même destructeur pour les crevettes immatures. L'utilisation de maillage plus fin pour un double cul de chalut diminue de plus la sélectivité déjà insuffisante pour cette espèce.

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


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