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Study of ichtyofauna biodiversity of rigth bank of Pool Malebo (Congo River)

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Author Affiliations

  • 1Laboratory of Animal Biology and Ecology Research, Superior Normal School, University Marien Ngouabi PoB 69 Brazzaville, Congo
  • 2Laboratory of Animal Biology and Ecology Research, Superior Normal School, University Marien Ngouabi PoB 69 Brazzaville, Congo Faculty of Sciences and Techniques, University Marien Ngouabi, PoB 69 Brazzaville, Congo
  • 3Laboratory of Animal Biology and Ecology Research, Superior Normal School, University Marien Ngouabi PoB 69 Brazzaville, Congo Faculty of Sciences and Techniques, University Marien Ngouabi, PoB 69 Brazzaville, Congo
  • 4Faculty of Sciences and Techniques, University Marien Ngouabi, PoB 69 Brazzaville, Congo
  • 5Faculty of Sciences and Techniques, University Cheik Anta Diop Dakar, Senegal

Res. J. Animal, Veterinary and Fishery Sci., Volume 1, Issue (10), Pages 1-9, November,24 (2013)

Abstract

Study ichtyofauna biodiversity of the right bank of Pool Malebo (between Kintele and Brazzaville) were done from January 2010 to December 2011 as part of the inventory of fishes of major rivers on the right bank of the Congo Basin. The fishing was carried out with cast nets and gill nets. Median values of following physicochemical parameters: air and water temperature, pH, conductivity, TDS, show that there is little variation during the year. TDS and conductivity vary considerably with a minimum (0 ppm ; 2 �S/cm) in February 2010 and a maximum in April 2011 (48 ppm ; 95.7�S/cm), the average of conductivity is 32. 8 �S/cm, average TDS is 16 ppm. Sampling done during two years permitted to identify 19317 specimens belonging to 163 species, 60 genera, 19 families and 8 orders. The Characiformes (43 species, 27%) and Osteoglossiformes (41 species, 25%) dominate the collection, followed by Siluriformes (28 species, 17%), the Perciformes (23 species, 14%) and the Cypriniformes (16 species, 10%). The most represented families are: Mormyridae (40 species, 25%), Alestidae, Distichodontidae and Cichlidae (19 species, 12%), Cyprinidae (16 species, 10%), Mockokidae (11 species, 7%). Clypeobarbus pleuropholis (3535 specimens, 18.3%), Ctenochromis polli (1956 specimens, 10%) are the most abundant species.Specific diversity is high with global Shannon index of 4.8 and equitability of 0.65. It means that the global population is slightly unbalanced. The fish population presented monthly a homogeneous distribution with equitability greater than or equal to 0.7, except in June and July 2011 where equitability is 0.63 and 0.5.

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