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Caractères Biométriques De Penaeus Kerathurus (Forskål, 1775) Du Golfe De Gabès, Tunisie (Decapoda, Penaeidae)

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image of Crustaceana

Eight-hundred-and-twenty-five individuals of Penaeus kerathurus were obtained from the landings of shrimp trawlers in a programme from February 1991 to February 1992. These samples consisted of 479 females and 346 males. In each sample the smallest sized specimen was a male and the biggest a female. The mean size Lc (= carapace length) of females (38.8 mm) is significantly greater than the mean size of males (Lc = 32.5 mm). Allometric equations show that the increases in size of, e.g., telson, rostrum, height, total size or weight in relation to the carapace length (reference size) is nearly equal for the two sexes and is expressed for all characters (except height and weight) in both sexes by a negative allometry. Application of the equality test of the regression slope for male and female shows that the parallelism hypothesis is accepted for all the regressions established, except that of weight in relation to the total length where the difference is highly significant.

Affiliations: 1: Institut National Scientifique et Technique d'Océanographie et de Pêche, 2025 Salammbô, Tunisie


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