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Growth and Reproductive Biology of Palaemon xiphias Risso, 1816 (Decapoda: Caridea: Palaemonidae)

G. Guerao, J. Pérez-Baquera and C. Ribera
Journal of Crustacean Biology
Vol. 14, No. 2 (May, 1994), pp. 280-288
Published by: Brill on behalf of The Crustacean Society
DOI: 10.2307/1548908
Stable URL: http://www.jstor.org/stable/1548908
Page Count: 9
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Growth and Reproductive Biology of Palaemon xiphias Risso, 1816 (Decapoda: Caridea: Palaemonidae)
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Abstract

Aspects of growth and reproductive cycle of the prawn Palaemon xiphias were studied in Alfacs Bay (Ebro delta, Spain) from December 1989 to December 1990. Growth is continuous throughout the year. Adult females are larger than males. Sexual differences related to length-weight were noted. Longevity was estimated to be 14-17 months. The growth equation estimated for males is: Lt = 50[1 - exp{- 1.57(t + 0.31) - ((0.45)(1.57)/2π)sin(2π(t - 0.9))}] and for females Lt = 70[1 - exp{- 1.92(t + 0.15)((0.6)(1.92)/2π)sin(2π(t - 0.9))}], where Lt is length (mm) at age t (in units of years). Ovigerous females were recorded between April and October. They were most numerous in May and June. Some of the early specimens appearing in the benthic population in summer had already spawned at the end of the reproductive period. The number of spawnings by a single female was a minimum of two. The number of eggs (range: 318-2,750) carried by females was related to their size: y=0.000727x3.5868; r = 0.91752; N = 30, where y = egg number and x = total female length (mm). /// Dans ce travail sont exposés les résultats de l'etude de la croissance et la reproduction de la crevette Palaemon xiphias de la rade des Alfacs (delta del Ebro, Espagne) entre décembre 1989 et décembre 1990. La croissance est constante pendant tout le cycle annuel, et les femelles atteignent une taille plus grande que les mâles. Il a été observé aussi que des différences sexuelles existent dans la relation taille-poids. La longévité pour cette espèce est d'environ 14-17 mois. L'équation de croissance calculée pour les mâles est Lt = 50[1 - exp{- 1,57(t + 0,31) - ((0,45)(1,57)/2π)sin(2π(t - 0,9))}] et pour les femelles Lt = 70[1 - exp{- 1,92(t + 0,15) - ((0,6)(1,92)/2π)sin(2π(t - 0,9))}], ou Lt est la longueur du corps (mm) à l'âge t (années). On a constaté la présence de femelles ovigères entre les mois d'avril et octobre. Le pourcentage maximum a été observé pendant les mois de mai et juin. Quelques crevettes incorporées à la population benthonique en été réalisent leur première ponte à la fin du mois de septembre. Le nombre de pontes pendant la période de reproduction est, au minimum de deux. Le nombre d'oeufs transportés (rang 318-2,750) est en relation avec la taille des femelles: y=0,000727x3.5868; r = 0.91752; N = 30, ou y = nombre d'oeufs et x = longueur totale (mm).

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