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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Feeding ecology and ontogenic diet shifts of juvenile fish species in an inverse estuary: The Sine-Saloum, Senegal
Estuarine, Coastal and Shelf Science, Volume 76, No. 2, Year 2008
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Description
We examined the diet of juvenile fish of four species - Eucinostomus melanopterus (Gerreidae), Ethmalosa fimbriata (Clupeidae), Monodactylus sebae (Monodactylidae), and Sarotherodon melanotheron (Cichlidae) - between their appearance on the nursery ground and the end of the recruitment season, when they began to shift to deeper parts of the estuary. Fish were collected from the Sine-Saloum, an inverse estuary in Senegal, West Africa. Sampling was conducted at six sites located along the salinity gradient. The study was conducted in the context of an inverse estuary where increasing salinity leads to the disappearance of mangroves. Stomach contents were sorted and the preferred prey determined to the lowest possible taxonomic level. Ontogenic changes in diet were characterized and results expressed as the frequency of occurrence of the prey. The results showed that almost all juveniles began with a "classical" zooplanktonic diet. Following that first stage, they then preyed on items belonging to the periphytic community in the vicinity of mangroves (when present). Juvenile Ethmalosa fimbriata, a phytoplankton feeder as an adult, displayed that kind of transitory diet, a finding not previously recorded. Plant material (algae and leaves) occurred frequently in the stomach contents. All four species began the ontogenic shift toward their adult diet at a length of 50 mm. The periphytic community supported on mangrove prop roots contributes to the diet of juvenile fish living in proximity to mangroves; this may not be verified for those fish living in open waters. © 2007 Elsevier Ltd. All rights reserved.
Authors & Co-Authors
Gning, Ndombour
France, Marseille
Ird Institut de Recherche Pour le Developpement
Senegal, Dakar
Université Cheikh Anta Diop de Dakar
Vidy, Guy
France, Marseille
Ird Institut de Recherche Pour le Developpement
Thiaw, Omar Thiom
Senegal, Dakar
Université Cheikh Anta Diop de Dakar
Statistics
Citations: 48
Authors: 3
Affiliations: 2
Identifiers
Doi:
10.1016/j.ecss.2007.07.018
ISSN:
02727714
Study Locations
Multi-countries
Senegal