Abstract
Knowledge of reproductive parameters is necessary to understand the ecology, the population dynamics and to enable rational management of fish of economic interest. This work is a contribution to the study of some aspects of the reproductive biology of the Atlantic mackerel Scomber colias (Gmelin, 1789) in the Mediterranean Moroccan coast. The study is based on samples taken from commercial catches in M’diq Bay. The spawning period was determined following both the monthly changes of the gonadosomatic index and the histological maturity stages. The Atlantic chub mackerel spawn between November and March, with maximum activity in December.
Highlights
The Atlantic chub mackerel Scomber colias (Gmelin, 1789) is a costal pelagic species
The gonadosomatic index (GSI) fluctuated throughout the year and revealed an increase in reproductive activity in November until March
The maximum average GSI value was obtained in December for both sexes
Summary
The Atlantic chub mackerel Scomber colias (Gmelin, 1789) is a costal pelagic species. It is frequent over the continental slope from the surface to 300 m depth. Colias is a gregarious and migratory species. It is widely distributed in the warm waters of the Atlantic Ocean, the Mediterranean Sea and the Black Sea. In the eastern Atlantic, chub mackerel occurs between the Bay of Biscay and South Africa [1]. Genetic divergence and phenotypic variation has been demonstrated that Scomber japonicus and Scomber colias were distinct. S. japonicus traditionally considered as a cosmopolitan species, their distribution is localized in the Indian and Pacific oceans [2, 3]
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