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Morphometric Relationships of Length-length and Length-weight in Parapenaeus Longirostris (Lucas, 1846) (Decapoda, Penaeidae)

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The objective of this study was to determine the length-length and length-weight relationships in Parapenaeus longirostris as a basis for conversions. Specimens were collected with hauls from the commercial trawler “Hapuloğlu” between 9 and 12 December 2006 in Sιğacιk Bay and Kuşadasι Bay in the Aegean Sea. Morphometric equations for the conversions of length and weight were constructed for females, males, and combined sexes. The equations for carapace length (CL), total length (TL), and body width (BW) for combined sexes were found as CL = 0.2296 × TL – 2.272, r 2 = 0.97, BW = 0.3708 × CL + 0.7694, r 2 = 0.91, and BW = 0.0861 × TL – 0.169, r 2 = 0.90, respectively. The length-weight relationship was determined as W = 0.0031× TL3.108, r 2 = 0.98 for total length and W = 0.546 × CL2.743, r 2 = 0.97 for carapace length. Males were generally smaller than females (K-S test; p < 0.05) and size-frequency distributions (TL, CL, and BW) revealed differences between females and males (K-S test; p < 0.05). Various length-length and length-weight regressions were also found to differ with sex (F test; p < 0.05), except TL-CL (F = 0.40; p > 0.05). L'objectif de cette étude a été de déterminer les relations longueur-longueur et longueur-poids chez Parapenaeus longirostris pour servir de base de conversion. Les spécimens ont été collectés à l'aide des traits de filet par le chalutier commercial “Hapuloğlu” entre le 9 et le 12 décembre 2006 dans les baies de Sιğacιk et Kuşadasι, en mer Egée. Les équations morphométriques pour les conversions de la longueur et du poids ont été établies pour les femelles, les mâles et les sexes combinés. Les équations pour la longueur de la carapace (CL), la longueur totale (TL) et la largeur du corps (BW) pour les sexes combinés sont respectivement de: CL = 0.2296 × TL – 2.272, r 2 = 0.97; BW = 0.3708 × CL + 0.7694, r 2 = 0.91; et BW = 0.0861 × TL – 0.169, r 2 = 0.90. La relation longueur-poids a été déterminée comme W = 0.0031 × TL3.108, r 2 = 0.98 pour la longueur totale et W = 0.546 × CL2.743, r 2 = 0.97 pour la longueur de la carapace. Les males sont en général plus petits que les femelles (K-S test; p < 0.05) et la fréquence de distribution des tailles (TL, CL et BW) révèle des différences entre les femelles et les mâles (K-S test; p < 0.05). Différentes régressions longueur -longueur et longueur -poids montrent aussi une différence entre les sexes (F test; p < 0.05), sauf pour TL-CL (F = 0.40; p > 0.05).

Affiliations: 1: Ege University, Faculty of Fisheries, TR-35100 Bornova-Izmir, Turkey;, Email:; 2: Ege University, Faculty of Fisheries, TR-35100 Bornova-Izmir, Turkey; 3: Istanbul University, Faculty of Fisheries, TR-34470 Laleli-Istanbul, Turkey, Akdeniz University, Faculty of Fisheries, TR-07058 Antalya, Turkey


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