Etude du regime alimentaire de Pomadasys incisus (Haemulidae) des cotes de Nouadhibou (Mauritanie).

Mamadou  DIA; M.  GHORBEL

doi:10.71754/instm.bulletin.v37.536

Authors

Mamadou DIA Institut Mauritanien de Recherche Oceanographique et de Peche (IMROP), Nouadhibou, BP 22 Mauritania
M. GHORBEL Institut National des Sciences et Technologies de la Mer (INSTM), Centre de Sfax BP 1035, 3018 Sfax

DOI:

https://doi.org/10.71754/instm.bulletin.v37.536

Keywords:

Diets, Food organisms, Feeding, Trawling, Marine invertebrates, Food, Predation, Predators, Trophic levels, Stomach content, Seasons, Fats, Marine molluscs, Activity patterns, Marine crustaceans, Sex, Size, Isopoda, Haemulidae, Mysidacea, Amphipoda, Brachyura, Annelida, Teleostei, Pomadasys incisus, Ampeliscidae, Marine, ASE, Mauritania

Abstract

The diet of bastard grunt Pomadasys incisus (Haemulidae) was studied, through quantitative and qualitative analysis of stomach contents of 464 individuals. These samples (from 14.30 to 28.70 cm fork length) were caught by trawling and / or line, from the region of Nouadhibou, during the period from February 2009 to January 2010. This study showed that the coefficient of vacuity means was 56.90%. This coefficient varied with the sex, the size and the seasons. A total of 23 prey species belonging to 17 major groups Anomura, Amphipoda, Brachyura, Cirripedia, Isopoda, Mysidacea, Tanaidacea, Stomatopoda, Bivalves, Gastropods, Cephalopods, Annelids, Echinoderms, Teleostei, Sipunculids) has been accurately identified. It appears from this analysis that P. incisus of Nouadhibou coasts feed mainly on Crustaceans and Annelids. Molluscs , Teleostei, Echinoderms and Sipunculids were incidental prey. Among the Crustacea, the Amphipoda Ampeliscidae are its favourite food. In annelids prey, the Neiridae occupied the first place. The trophic level, estimated at 3.5, showed that this species is omnivorous with preference for animal prey. This feed pattern varied seasonally and among the size of fish.