Résumé:
The diet of mackerel (Scomber japonicus) has been studied by analyzing stomach contents
of fish in the Mostaganem area. Data analysis of stomach contents was made by the methods: the
importance index Nm, the index food Q.
The food index Q showed that mackerel has a diet composed of five main preys, two of which
are preferred: fish and copepods, amphipods, gastropods.
This species feeds mainly on preferential prey followed by polychaetes and crustaceans, and
zooplanktonic organisms, such as cephalopods and small pelagic fish, especially anchovies and
sardines.
In addition, planktonic crustaceans are always present in the diet of mackerel
Mackerel shows a double feeding strategy: the strategy of specialization for fish and the strategy
of generalization for other preys.
