Growth weight and reproductive cycle in the mussel (Mytilus galloprovincialis) from Cala Iris sea of Al Hoceima (Northern Morocco)

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Growth weight and reproductive cycle in the mussel (Mytilus galloprovincialis) from Cala Iris sea of Al Hoceima (Northern Morocco)

Ghizlane Azizi, Mostafa Layachi, Mustapha Akodad, Mourad Baghour, Ali Skalli, Abdelmajid Moumen
Int. J. Biosci.16( 6), 140-151, June 2020.
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This work aims to evaluate a link among weight variations of Mediterranean mussel Mytilus galloprovincialis/M. galloprovincialis, condition index and the environmental parameters. In order to determine the growth weight parameters (total weight, fresh and dry mass tissue weight as well as fresh and dry shell weight) of the bivalve, sampling M. galloprovincialis were collected from a mussel farm located along the coastline of Al Hoceima (Moroccan Mediterranean Sea), during the period 2016. The environmental parameters were recorded at the same sampling site. Results show that, the physicochemical parameters affect the growth weight parameters, condition index and the reproductive cycle of M. galloprovincialis. The condition index variation is a function of weight, which is itself a function of the gonadal development as well as the availability of phytoplankton. The period of maximum gain weight was observed in summer season, which correspond to the high condition index value, and was associated with the maturity of gonads. The lowest values of CI observed in February (8.71) and May (8.63) coincided with the two major spawning periods. Knowledge of the gametogenic cycle and physicochemical factors that may affect them may constitute a basic data, necessary to choose mussel farming sites, and for a good and sustainable commercial exploitation of bivalves in this part of the Mediterranean Sea.


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