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Belkhodja H.,Institute Superieur Of Peche Et Daquaculture Of Bizerte | Jaafoura M.H.,Institute Mohamed Kassab DOrthopedie | Missaoui H.,Direction Generale de la Peche et de LAquaculture de Tunis | Romdhane M.S.,Institute National Agronomique Of Tunis
Cahiers de Biologie Marine | Year: 2011

This study devised a staging system for and monitored the gonad development of the limpet Patella caerulea in La Goulette harbour (Gulf of Tunis) using a Gonad Somatic Index (GSI) and histological techniques. Sex ratio varied along the study period, where samples always presenting more males than females. Maturation began in August/September for both sexes. In males, spawning took place from March to August 2006 and from April to June 2007. Regarding females, spawning took place from May to July 2006 and from April to July 2007. A secondary spawning peak was observed in January 2007 for both sexes. No statistical differences were registered between GSI of both sexes; however, the use of the GSI in determining the annual reproductive cycle is discussed. High wind speed under optimum conditions of temperature and salinity appear to induce spawning in the limpets.

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