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Premi`re Approche de la Croissance de Penaeus Kerathurus (Decapoda, Penaeidae) dans le Golfe de Gabès, Tunisie [First Approach to the Growth of Penaeus Kerathurus (Decapoda, Penaeidae) in the Gulf of Gabes, Tunisia]

2004; Brill; Volume: 77; Issue: 3 Linguagem: Inglês

10.1163/1568540041181556

1568-5403

Sadok Ben Meriem,

Crustacean biology and ecology

[Methods of length frequency analysis were used to study the growth of the shrimp, Penaeus kerathurus in the Gulf of Gabes. In this area, six trawl surveys were carried out to collect specimens for a series of length frequency distributions. Different techniques (Bhattacharya, Normsep, and Mix) have been used to separate these distributions from their Gaussian component and to determine the average length of the various cohorts. An age was assigned to each mean length (cohort) on the base of previous information regarding the period of spawning and the date of sampling. Growth parameters were calculated using the growth model of Von Bertalanffy (1938) and the data of age and mean length. The mean values of L∞ (mm),K (year), and t0, and their standard deviation (sd) would be for females: 203.43 (sd 15.46), 0.60 (sd 0.16), and −0.88 (sd 0.23), and for males: 157.17 (sd 12.81), 0.78 (sd 0.36), and −1.00 (sd 0.50), respectively. Des methodes d'analyse des distributions des tailles ont ete utilisees pour etudier la croissance de la crevette Penaeus kerathurus dans le golfe de Gabes. Six campagnes de chalutages experimentaux ont ete realisees dans cette region en vue de collecter les distributions de taille des captures de cette espece. La decomposition modale de ces distributions par differentes techniques (Bhattacharya, Normsep et Mix) a permis de calculer la taille moyenne de chaque mode identifie auquel nous avons attribue un âge en nous referant a la date de ponte et a celle de l'echantillonnage. A partir de ces resultats ont ete calcules les parametres de croissance L∞ (mm), K (l'an) et t 0 de l'espece en utilisant le modele de Von Bertalanffy (1938); leurs valeurs moyennes et les ecarts-types (se) correspondants seraient, respectivement, pour les femelles: 203,43 (se 15,46), 0,60 (se 0,16) et −0, 88 (se 0,23); pour les males: 157,17 (se 12,81), 0,78 (se 0.36) et. −1, 00 (se 0,50)., Methods of length frequency analysis were used to study the growth of the shrimp, Penaeus kerathurus in the Gulf of Gabes. In this area, six trawl surveys were carried out to collect specimens for a series of length frequency distributions. Different techniques (Bhattacharya, Normsep, and Mix) have been used to separate these distributions from their Gaussian component and to determine the average length of the various cohorts. An age was assigned to each mean length (cohort) on the base of previous information regarding the period of spawning and the date of sampling. Growth parameters were calculated using the growth model of Von Bertalanffy (1938) and the data of age and mean length. The mean values of L∞ (mm),K (year), and t0, and their standard deviation (sd) would be for females: 203.43 (sd 15.46), 0.60 (sd 0.16), and −0.88 (sd 0.23), and for males: 157.17 (sd 12.81), 0.78 (sd 0.36), and −1.00 (sd 0.50), respectively. Des methodes d'analyse des distributions des tailles ont ete utilisees pour etudier la croissance de la crevette Penaeus kerathurus dans le golfe de Gabes. Six campagnes de chalutages experimentaux ont ete realisees dans cette region en vue de collecter les distributions de taille des captures de cette espece. La decomposition modale de ces distributions par differentes techniques (Bhattacharya, Normsep et Mix) a permis de calculer la taille moyenne de chaque mode identifie auquel nous avons attribue un âge en nous referant a la date de ponte et a celle de l'echantillonnage. A partir de ces resultats ont ete calcules les parametres de croissance L∞ (mm), K (l'an) et t 0 de l'espece en utilisant le modele de Von Bertalanffy (1938); leurs valeurs moyennes et les ecarts-types (se) correspondants seraient, respectivement, pour les femelles: 203,43 (se 15,46), 0,60 (se 0,16) et −0, 88 (se 0,23); pour les males: 157,17 (se 12,81), 0,78 (se 0.36) et. −1, 00 (se 0,50).]