Iris Publishers- Oceanography and marine biology | Differences in Fish Assemblage Structure

Authored by Ousmane Diankha

This work is a preliminary comparative study of fish assemblage between a marine protected area where fishing is banned in Joal-Fadiouth (JFMPA) and a fishing authorized marine protected in Cayar (CMPA). It consisted of seasonal sampling between 2015 and 2016. Trophic classification based on food regime was performed in order to describe the fish fauna of these MPA. Multivariate analysis like factorial correspondence analysis and hierarchical classification analysis were carried out to study the spatial differences of fish assemblages. Both MPA had similar number of species, 103 fish species belonging to 45 families. However, a fundamental difference in terms of fish composition, abundance and biomass were noted. Only 38 fish species were shared by these MPA. In other words, among the 103 fish species found in CMPA 65 were not encountered in JFMPA. The total number of individuals in JFMPA was six time higher, and the biomass in JFMPA was triple of that in CMPA. The fish assemblage of CMPA was dominated in terms of abundance by two second-level predators Pagellus bellottii and Galeoides decadactylus (12.4%), while in JFMPA the pelagic herbivores Ethmalosa fimbriata (34%) dominated the fish assemblage. Our results suggest that management strategy in JFMPA seem to be more efficient than that of CMPA. Therefore, fishing activities in CMPA, even controlled seem to have negative effect on fish abundance.

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