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La croissance absolue de Mytilus galloprovincialis dans le lac de Bizerte : relation taille/ âge dans les stations d’élevage.

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Author
Aloui - Bejaoui, Nejla
Date
1998

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Alternative Title
Growth of Mytilus galloprovincialis in Bizerte lake: relation length-age in the rearing stations
Abstract
La relation de croissance absolue liant la taille a l'age de la moule Mytilus galloprovincialis est comparee dans 3 stations mytilicoles du Lac de Bizerte. L'etude est realisee sur la base de l'analyse de la distribution des frequences de taille des individus sur les cordes d'elevage d'octobre 1994 a septembre 1995. La mise en evidence de la nouvelle cohorte et le suivi de la croissance lineaire des nouvelles recrues de mai 1995 a avril 1996 a permis d'etablir le modele de croissance de Von Bertalanffy (1938). Mytilus galloprovincialis trouve dans le lac de Bizerte les conditions favorables a sa croissance en longueur. Les parametres des equations de croissance ont des valeurs tres proches dans les deux stations du parc conchylicole de Menzel Jemil et sont comparables a celles d'autres populations de l'espece. La croissance en longueur des moules de la station 3 est, par contre, nettement plus faible. La concentration du milieu en matieres nutritives et la densite des individus sur les cordes influencent directement la croissance de la coquille, d'ou l'importance du choix du site et de la technique de suspension dans tout elevage mytilicole.
The relation length - age of Mytilus galloprovincialis is compared in 3 sites of Bizerte lake (Tunisia). The study is based on the analysis of frequencies distribution of mussel's size from october 1994 to september 1995. The growth of the new cohort identified allows to establish Von Bertalanffy's model (1938). The parameters of equations are comparable in suspended cultivation in Menzel Jemil. Mussel's growth in the third station is low. Results obtained put in evidence the importance of choice of site and process of farming in mussel cultivation.
Journal
Bulletin de l'Institut National des Sciences et Technologies de la Mer
Volume
25
Page Range
pp. 51-66
URI
http://hdl.handle.net/1834/8766
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Articles - Bulletin de l'INSTM

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