Diversity of fish and fisheries from the Lake Encantada Environmental Protection Area,Ilhéus,Brazil |
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| Authors: | GRA Rocha A Schiavetti |
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| Institution: | 1. Departamento de Ciências Biológicas, Universidade Estadual de Santa Cruz, Rodovia Ilhéus‐Itabuna, km 16, 45650‐000, Ilhéus, BA, Brazil;2. Departamento de Ciências Agrárias e Ambientais, Universidade Estadual de Santa Cruz, Ilhéus, BA, Brazil |
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| Abstract: | - 1. Lake Encantada, in the basin of the Almada River (Bahia State), has an area of 650.5 ha and a perimeter of 13.3 km. In 1993, an area of 11 800 ha around the lake was designated an Environmental Protection Area (Class V category). The main goal of this study was to identify fish species in the lake and to determine possible threats to their conservation.
- 2. Fish samples were obtained with gillnets between May 2002 and February 2004, and used to calculate indices of species diversity Shannon (H′), richness (d) and evenness (J′).
- 3. Eleven fish species comprising nine families were collected during the sampling period. Three introduced species occurred in the lake: Prochilodus argenteus, endemic to the São Francisco river basin, and two African species, Oreochromis niloticus and Clarias gariepinus. In overall ranking, Prochilodus argenteus was first in number of individuals (46%) and weight (59%), followed by Genidens genidens in numbers (31%), and Clarias gariepinus in weight (15%).
- 4. The occurrence and dominance of introduced species is discussed as well as their possible impacts on the trophic structure of this ecosystem.
Copyright © 2007 John Wiley & Sons, Ltd. |
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| Keywords: | freshwater diversity fish non‐native species conservation |
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