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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.


Belkhodja H.,Institute Superieur Of Peche Et Daquaculture Of Bizerte | 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: 2012

The limpets Patella caerulea was evaluated as possible biomonitor of heavy metal contamination in marine coastal areas. Water samples and specimens of the limpet were sampled seasonally during 2006-2007, from three different stations in the North coasts of Tunisia (Bizerta Channel: CB, La Goulette: LG and Sidi Rais: SR) to measure their accumulated heavy metal concentrations. The concentrations of Fe, Mn, Cu, Cd, Cr, Ni, Al and Pb were determined by ICP-OES methods. In water samples, only 3 metals (Mn, Cu and Al) were detected at different stations while in the limpet all the investigated metals were found. Iron and Aluminium concentrations in soft tissues of P. caerulea were significantly higher (ANOVA, p < 0.05) than the concentration of the other metals in all the stations while the lowest one was cadmium concentration. The order of metal accumulation in the animal at different stations was: Fe >> Al >> Mn - Cu > Ni - Pb > Cr > Cd. The highest mean values of the heavy metals in soft tissues of P. caerulea were found at CB station, for Cd, Cr and Fe. We also noticed at the same station relatively high mean values for Ni, Al and Pb; at LG station, for Mn, Cu and Pb and at SR station for Al.

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