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Preliminary biodiversity inventory of Ichtyofauna of Tsieme River, A tributary of Congo River(Pool-Malebo)

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Author Affiliations

  • 1Research Laboratory of Animal Biology and Ecology, ENS, University Marien Ngouabi, PoB 69 Brazzaville, CONGO
  • 1Faculty of Sciences and Techniques, University Marien Ngouabi, PoB 69 Brazzaville,CONGO

Int. Res. J. Environment Sci., Volume 2, Issue (12), Pages 57-65, December,22 (2013)

Abstract

The ichthyological inventory of Tsieme River (north of Brazzaville), a tributary of the right bank of Congo River (Pool Malebo) was performed at the upper and lower reaches , from February to July 2011. Physicochemical parameters vary stations: the average water temperature is 27.6 °C, the average conductivity is 75 µS/cm and the average TDS of 37.47 ppm and the average pH is 6.7. Sampling of ichtyofauna made with the castnet in three stations, permitted to identify 1299 specimens belonging to 47 species, 29 genera, 13 families and 5 orders. The Perciformes dominates with 31 %, followed by Siluriformes (26%) and Osteoglossiformes (20 %). Cichlidae (26%) are the most represented family, followed by Cyprinidae and Mormyridae (15%). The most representative species are: Synodontis nummifer (38%) and Tilapia sp (15%). The settlement of the station 1 seems richer and more diversified with 23 species, followed by station 3 with 21 species and the station 2 with 17 species. The comparison stands three stations show a great similarity between stations 2 and 3, station 1 is very different. The overall analysis of the results shows that the ichthyological population of Tsieme River is unbalanced (equitability = 0.59), although diversified (H ' = 2.29).

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