Research Journal of Animal, Veterinary and Fishery Sciences ___________________________ ISSN 2320 – 6535 Vol. 1(10), 1-9, November (2013) Res. J. Animal, Veterinary and Fishery Sci. International Science Congress Association 1 Study of ichtyofauna biodiversity of rigth bank of Pool Malebo (Congo River) Mady-Goma Dirat I., Mikia M.1,2, Tsoumou A.1,2, Vouidibio J. and Pandare D.3 Laboratory 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 Faculty of Sciences and Techniques, University Cheik Anta Diop Dakar, Senegal Available online at: www.isca.in, www.isca.me Received 4th October 2013, revised 6th November 2013, accepted 22nd November 2013Abstract Study ichtyofauna biodiversity of the right bank of Pool Malebo (between Kintélé 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 µS/cm) in February 2010 and a maximum in April 2011 (48 ppm ; 95.7µS/cm), the average of conductivity is 32. 8 µS/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. Keywords: Ichtyofauna, biodiversity, Shannon index, equitability, Pool Malebo Introduction Aquatic continental ecosystems have a great socio-economical, cultural and scientific importance for people They represent a natural asset and a generator of services, in terms of uses that are actually present or that could be done in futur. Congo Brazzaville is one of Central Africa countries where biodiversity is less known. Different protected areas created in the sub-region have placed particular emphasis on the study of big Mammals. Studies of other zoological groups are few and fragmented, as is the case of diversity of freshwater ichtyofauna. Scientific knowledge of african ichtyofauna is new and is still an under-explored area it’s the same situation for many countries like India . Many rivers of Congo have not yet been explored and systematic ichthyological inventory of some rivers have not been realized, usually ichtyofauna of the rigth bank of Congo Basin (Republic of Congo) is extrapolated through that of the left bank of Congo Basin (Democratic republic of Congo). These results in fragmented data to the stream and start development work often without a real data base forichtyofauna. Fishes are one of the best indicators of quality ofany aquatic ecosystem and occupy a remarkable position from a socioeconomical point of view. Moreover, the initiation of several projects (dams, roads, airports, and rail) will necessarily have an impact on aquatic ecosystems. A good knowledge of fish populations is essential to have a typology of different rivers, for a best management of these aquatic ecosystems and for adopting suitable conservation measures. Conservation is the only way that presently exist to save biodiversity. It is imperative that investigations be carried out to provide informations on the ichtyofauna diversity of Congo Basin. The earliest study on Pool Malebo (Democratic Republic of Congo) was made on the left bank there is a fifty years10. In spite of his rich diversity, literature concerning studies of fish diversity of the right bank of Congo Basin is scarce.11 The first study performed there is a dozen years on the right bank of Pool Malebo (Republic of Congo), was an inventory of Kintambo rapids fishes12. The second study on the right bank focused on the inventory of Kintele port fishes13 In this study, we completed the census by ecological data on fish populations on the right bank of the Congo River (species richness of orders and families, diversity indexes, specific relative abundance). Material and Methods This study was realized on the right bank of Congo River (Pool Malebo) between Port Kintele and Port Leon in Brazzaville (Figure- 1). Fishes were captured with cast nets and gill nets. Specimens after fixation in formalin 10% are preserved in alcohol 70 . Fishes so collected are identified using different Research Journal of Animal, Veterinary and Fishery Sciences ________________________________________ ISSN 2320 – 6535 Vol. 1(10), 1-9, November (2013) Res. J. Animal, Veterinary and Fishery Sci. International Science Congress Association 2 keys available and classified by the Cloffa (Check-List o the Freshwater Fishes of Africa) classification scheme given14 ,15,16,17 . The data collected allowed to establish the specific diversity index of Shannon18, the Pielou index or equitability19 . Results and Discussion In order to characterize the biotope in which fishes live, physicochemical parameters of surface water (air temperature, surface water temperature, pH, conductivity and TDS) were measured (figure- 2). Among these five parameters, only TDS and conductivity varies considerably with a minimum (0 ppm; 2 µS/cm) in February 2010 and a maximum in April 2011 (48 ppm; 95,7 µS/cm). The pH of Congo River water has a neutral average value of 7,1 ; the minimal value of 6,44 was obtained in November and December 2010 and the maximal value (7,7) in june 2011. The average air temperature is 28 4C with a minimum of 26 7C (November 2011) and a maximum of 30 5 (March 2010). The surface water temperature varies between 26 6 (july 2010 et 2011) and 29 5 (March 2010), with a average of 28 4. Results are so very close to those of the two studies made in Congo River, with sligth variations related to the environmental conditions20,21 Ichtyofauna composition: The number of specimens obtained is 19 317 belonging to 163 species, 60 genera, 19 families and 8 orders (Table-1). Species are presented using their scientific and vernacular names. Figure-1 Map of study area janv-10 February March April May June July August September October November Décember janv-11 February March April May June July August September October November December Values TDS Conductivity Air temperature Water temperature Figure-2 Physicochemistry of surface water Research Journal of Animal, Veterinary and Fishery Sciences ________________________________________ ISSN 2320 – 6535 Vol. 1(10), 1-9, November (2013) Res. J. Animal, Veterinary and Fishery Sci. International Science Congress Association 3 Table-1 List of species Order and Family N Name of species Code Number Vernacular name Lingala Kikongo Osteoglossiformes Notopteridae 1 Xenomystus nigri XMN12 Peke Peko Mormyridae 2 Campylomormyrus elephas CME 1 Mpima Mbese 3 Campylomormyrus ibis CMI 4 Mpima Mbese 4 Campylomormyrus sp CMS 7 Mpima Mbese 5 Campylomormyrus tamandua CLT 24 Mpima Mbese 6 Cyphomyrus discorhynchus CMD 11 Mbese Mbese 7 Cyphomyrus macrops CMM 402 Mbese Mbese 8 Cyphomyrus psittacus CMP 74 Mbese Mbese 9 Cyphomyrus sp1 CPM 17 Mbese Mbese 10 Cyphomyrus sp2 CPR 8 Mbese Mbese 11 Genyomyrus donnyi GMD 3 Mbese Mbese 12 Gnathonemus petersi GNP 30 Mpima Mbese 13 Gnathonemus sp GNS 20 Mpima Mbese 14 Marcusenius greshoffi MCG 123 Bosso Mbese 15 Marcusenius intermedius MCI 13 Bosso Mbese 16 Marcusenius kutuensis MCK 4 Bosso Mbese 17 Marcusenius m. angolense MMA 9 Bosso Mbese 18 Marcusenius moorii MCM 88 Bosso Mbese 19 Marcusenius schuiltuisiae MST 28 Bosso Mbese 20 Marcusenius sp MSP 4 Bosso Mbese 21 Marcusenius stanleyanus MSL 45 Bosso Mbese 22 Mormyrops anguilloïdes MMA 8 Mbese Ndzanda 23 Mormyrops sp MMR 4 Mbese Ndzanda 24 Mormyrus bombanus MMB 1 Mbese Mbese 25 Mormyrus caballus MMC 2 Mbese Mbese 26 Mormyrus longirostris MML 1 Mbese Mbese 27 Mormyrus ovis MMO 9 Mbese Mbese 28 Mormyrus sp MMU 1 Mbese Mbese 29 Myomurus macrodon MMD 4 Mpima Mbese 30 Petrocephalus balayi PPB 6 Mbese Mbese 31 Petrocephalus bane PCB 1 Mbese Mbese 32 Petrocephalus chrysti PCC 530 Mbese Mbese 33 P. microphtalmus PCM 226 Mbese Mbese 34 Petrocephalus sauvagi PTS 6 Mbese Mbese 35 Petrocephalus simus PCS 210 Mbese Mbese 36 Petrocephalus sp1 PCP 35 Mbese Mbese 37 Petrocephalus sp2 PTC 24 Mbese Mbese 38 Pollimyrus nigripinnis PMP 18 Mbese Mbese 39 Pollimyrus sp PMS 52 Mbese Mbese 40 Stomatorhinus fulginosus STF 1 Mbese Mbese 41 Stomatorhinus sp STS 1 Mbese Mbese Clupéiformes Clupeidae 42 Microthrissa congica MTC 181 Nsangi - 43 Microthrissa sp MTS 21 Nsangi - 44 Odaxothrissa sp OTS 2 Nsangi - 45 Pellonulla leonensis PNL 282 Nsangi - 46 Pellonulla vorax PNV 71 Nsangi - Gonorhynchiformes- Chanidae 47 Parachanna insignis PCI 43 Ntsinga Mongusu Research Journal of Animal, Veterinary and Fishery Sciences ________________________________________ ISSN 2320 – 6535 Vol. 1(10), 1-9, November (2013) Res. 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International Science Congress Association 4 Cypriniformes Cyprinidae 48 Clypeobarbus pleuropholis CBP 3535 - - 49 Labeo cyclorhynchus LCR 18 Munganza Monganza 50 Labeo greeni LGN 19 Moumpongo Mompongo 51 Labeo lineatus LLT 306 Munganza Monganza 52 Labeo lualuabaensis LBL 2 Munganza Monganza 53 Labeo nasus LNS 14 Munganza Monganza 54 Labeo parvus LBP 13 Munganza Monganza 55 Labeo sp1 noir LBC 1 Munganza Monganza 56 Labeo sp2 LBN 1 Munganza Monganza 57 Labeo sp3 LBO 6 Munganza Monganza 58 Labeo velifer LVF 6 Nvulu Mompongo 59 Labeo weeksi LWK 90 Ntsuele Mombete 60 Leptocypris lujae LCL 85 - - 61 Leptocypris weeksi LCW 154 - - 62 Raïamas buchholzi RAB RAB 74 Mulima - 63 Raïamas chrysti RAC 21 Mulima - Characiformes Alestidae 64 Alestes liebrechtsi ALT 35 - Mokobe 65 Alestopetersius sp APS 26 - Mokobe 66 Brycinus comptus BCP 1144 Nsangi ya kuala - 67 Brycinus imberi BCI 202 Nsangi ya kuala - 68 Brycinus macrolepidotus BML 35 Mouba Mapoyo 69 Brycinus poptae BPP 11 Nsangi ya kuala - 70 Brycinus sp BCS 2 Nsangi ya kuala - 71 Bryconaethiops macrops BAC 56 Nsuele - 72 Bryconaethiops microstoma BAM 9 Nsuele - 73 Duboisialestes bifascatus DAB 34 - - 74 Duboisialestes tumbense DAT 65 - - 75 Hydrocynus forskali HCF 4 Mbenga Mbenga 76 Hydrocynus vittatus HCV 20 Mbenga Mbenga 77 Micralestes acutidens MAT 1635 Munduku - 78 Micralestes occidentalis MCO 10 Munduku - 79 Micralestes stormsi MSM 14 Munduku - 80 Micralestes sp MAS 14 Munduku - 81 Phenacogrammus interruptus PGI 198 - - Citharinidae 82 Citharinus congicus CTC 2 Yanga Liyanga 83 Citharinus gibbosus CTG 10 Yanga Liyanga 84 Citharinus latus CTL 1 Yanga Liyanga 85 Citharinus macrolepis CTM 1 Yanga Liyanga 86 Citharinus sp CTS 20 Yanga Liyanga Distichodontidae 87 Belanophago hutsebauti BPH 4 - - 88 Belanophago tinanti BPT 7 - - 89 Distichodus atroventralis DCA 8 Mbutu Mboto 90 Distichodus affinis DCF 23 Mbutu Mboto 91 Distichodus altus DCT 23 Mbutu Mboto 92 Distichodus antonii DCN 20 Mbutu Mboto 93 Distichodus fasciolatus DCC 16 Mbutu Mboto 94 Distichodus lussosso DCL 1 Mbutu Mboto 95 Distichodus notospilus DCO 11 Mbutu Mboto 96 Distichodus sexfasciatus DCS 76 Mbutu Mboto 97 Distichodus sp DCP 2 Mbutu Mboto 98 Hemistichodus sp HSM 1 - - 99 Non identifié NIF 1 - - Research Journal of Animal, Veterinary and Fishery Sciences ________________________________________ ISSN 2320 – 6535 Vol. 1(10), 1-9, November (2013) Res. 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International Science Congress Association 5 100 Ichtyborus ornatus IBO 94 - - 101 Mesoborus crocodilus MSC 10 Minkari nkari- 102 Nannocharax macropterus NCM 1 Kaki - 103 Nannocharax sp NCX 35 Kaki - 104 Nannocharax gracilis NCG 7 Kaki - 105 Phago boulengeri PBL 214 Mutitikiri - 106 Xenocharax sp XCS 1 - - Siluriformes Claroteidae 107 Auchenoglanis occidentalis AGO 3 Mbuka Mboka 108 Chrysichthys longibarbis CIL 4 Wukutu ou Suaro Lisuaro 109 Chrysichthys ornatus CIO 29 Wukutu ou Suaro Lisuaro 110 Chrysichthys punctatus CIP 10 Wukutu ou Suaro Lisuaro 111 Chrysichthys sp 1(t. pl) CIS 30 Wukutu ou Suaro Lisuaro 112 Chrysichthys sp2 (t ét ) CIT 16 Wukutu ou Suaro Lisuaro 113 Chrysichthys thoneri CIH 153 Wukutu ou Suaro Lisuaro 114 Parauchenoglanis sp PCG 1 Ke - Schilbeidae 115 Parailia congica PLC 358 Malewa - 116 Schilbe grenfelli SGF 17 Langwa Lilangwa 117 Schilbe intermedius SIT 1389 Langwa Lilangwa Amphiliidae 118 Belanoglanis tenius BGT 12 Mutitikiri - Clariidae 119 Clarias gariepinus CGP 1 Ngola Ngolo 120 Clarias sp1 CRS 7 Ngola Ngolo 121 Clarias sp2 CRP 1 Ngola Ngolo Malapteruridae 122 Malapterurus electricus MPE 5 Tsula Nina 123 Malapterurus microstoma MPM 15 Tsula Nina 124 Malapterurus sp MPS 3 Tsula Nina Mockokidae 125 Microsynodontis sp MSD 2 - - 126 Synodontis alberti SDA 124 Nkoko Likoko 127 Synodontis caudalis SCD 1 Nkoko Likoko 128 Synodontis congicus SDG 1 Nkoko Likoko 129 Synodontis decorus SDD 6 Nkoko Likoko 130 Synodontis nigriventris SNV 231 Nkoko Likoko 131 Synodontis notatus SNT 10 Yabala Likoko 132 Synodontis nummifer SNM 464 Nkoko Likoko 133 Synodontis schoutedeni SST 66 Nkoko Likoko 134 Synodontis sp1 SDC 8 Nkoko Likoko 135 Synodontis sp2 SDS 6 Nkoko Likoko Synbranchiformes Mastacembelidae 136 Mastacembelus congicus MCC 4 Mumfulantsie - Perciformes Centropomidae 137 Lates niloticus LNT 1 « Capitaine » Nzabé Cichlidae138 Ctenochomis polli CCP 1956 Kaki 140 Ctenochromis sp CCS 10 Kaki - 141 Hemichromis elongatus HCE 324 Tsingulu - 143 Hemichromis sp HCM 17 Tsingulu - 144 Hemichromis stellifer HCS 68 Tsingulu - 145 Lamprologus mocquardi LPM 129 Kaki - 146 Lamprologus casuerus LPC 5 Kaki - 147 Lamprologus sp1 LPS 17 Kaki - 149 Lamprologus sp2 LPL 5 Kaki - 150 Nannochromis sp NCS 35 Kaki - 151 Sarotherodon boulengeri STB 733 Bundu Libunbu 152 Sarotherodon galileus STG 63 Bundu Libunbu 153 Sarotherodon sp STD 2 Bundu Libunbu Research Journal of Animal, Veterinary and Fishery Sciences ________________________________________ ISSN 2320 – 6535 Vol. 1(10), 1-9, November (2013) Res. J. Animal, Veterinary and Fishery Sci. International Science Congress Association 6 154 Tilapia tholloni TTL 1504 Bundu Libunbu 155 Tilapia sp TLS 3 Bundu Libunbu 156 Tylochromis lateralis TCL 276 Bundu Libunbu 157 Tilapia zilli TTZ 56 Bundu Libunbu 158 Tylochromis sp TCS 37 Bundu Libunbu Anabantidae 159 Ctenopoma acutirostre CPA 1 Tsimpete tsia nkuku Mukengue 160 Ctenopoma nebulosum CPN 1 Tsimpete tsia nkuku Mukengue Tetraodontiformes Tetraodontidae 161 Tetraodon mbu TOB 1 Fuula or Mbumbi Mbulitsui 162 Tetraodon miurus TOM 6 Fuula or Mbumbi Mbulitsui 163 Tetraodon sp. TOS 1 Fuula or Mbumbi Mbulitsui Specific richness of orders: Fishes identified belong to 8 orders, two orders dominate (Figure- 3): Characiformes (43 species, 27%) and Osteoglossiformes (41 species, 25%), followed by Siluformes (28 species, 17%) the Perciformes (23 species, 14%), the Cypriniformes (16 species, 10%). The three orders are less represented Clupeiformes (6 species, 4%), Tetraodontiformes (3 species, 2%) and Synbranchiformes (1 species, 1%). These results show that the same orders prevail in the Congo Basin, but in a different order: Siluriformes (23.5%), Perciformes (19%), Osteoglossiformes (16.5%), Cypriniformes (16.3%) and Characiformes (14.3%). The same orders were also identified in different proportion3,22,23,24 in Congo River, Mambili River, Alima River and Lefini River.     Ostéoglossiformes Characiformes Perciformes Cypriniformes Clupeiformes Siluriformes Tétraodontiformes Synbranchiformes Figure-3 Proportional repartition of specific richness of orders Specific richness of families: The fish species identified belonging to 19 families (Figure- 4), the most represented are: Mormyridae (40 species, 25%), Alestidae, Distichodontidae , Cichlidae (19 species, 12%) and Cyprinidae (16 species, 10%). These families are followed by Mockokidae (11 species, 7%), Claroteidae (8 species, 5%), Clupeidae (6 species, 4%), Citharinidae (5 species, 3%), Tetraodontidae, Schilbeidae, Malapteruridae and Clariidae (3 species, 2%), Anabantidae (2 species, 1%), Amphiliidae, Centropomidae, Channidae, Notopteridae and Mastacembelidae (one species, %). The Mormyridae are the dominant family in the Congo Basin3,22,23,24. \n     \n    Mormyridae Alestidae Distichodontidae Cichlidae Cyprinidae Mockokidae Claroteidae Clupeidae Citharinidae Autres Figure-4 Proportional repartition of specific richness of families Relative specific abundance: The relative specific abundance is shown in Figure-5.              Clypeobarbus pleuropholis Ctenochomis polli Micralestes acutidens Tilapia tholloni Schilbe intermedius Brycinus comptus Sarotherodon boulengeri Petrocephalus chrysti Synodontis nummifer Cyphomyrus macrops Parailia congica Hemichromis elongatus Labeo lineatus Autres Figure-5 Specific relative abundance Research Journal of Animal, Veterinary and Fishery Sciences ________________________________________ ISSN 2320 – 6535 Vol. 1(10), 1-9, November (2013) Res. J. Animal, Veterinary and Fishery Sci. International Science Congress Association 7 The six most abundant species are: Clypeobarbus pleuropholis(3535 individuals, or 18.3%); Ctenochromis polli (1956 individuals, 10%); Micralestes acutidens (1635 individuals, 8.5%); Tilapia tholloni (1504 individuals, representing 8%); Schilbe intermedius (1389 individuals, or 7.2%); Brycinus comptus (1144 individuals, 6%). Specific diversity: For the entire stretch of Pool Malebo withheld during this study (between the port Kintele and port Leon), t he fishes populations are very diversified, Shannonindex is 4.8, equitability is 0.65. It means that the population is slightly unbalanced. Diversity index vary monthly (Figure- 6), the highest Shannon index was recorded in January 2010 (4.7) and the lowest value were obtained in June and July respectively 3 and 2.8. The values of the equitability (E) throughout the month show homogeneous distribution of fishes populations. However, a slight unbalance is observed in June 2011 (0.63). In July 2011, the distribution of population is unbalanced, with an equitability of 0.5. The Shannon index and equitability show a seasonal variation (Figure- 7). Whatever the season, specific diversity is high (greater than 4). The equitability equal to 0.67 in the rainy season, the population distribution is homogeneous so well balanced, dry season equitability is slightly lower, equal to 0.63, the population distribution is slightly unbalanced.  \n \n \n \n \n Diversity indexMonths Shannon index Equitability Figure-6 Monthly variation of Shannon index and equitability  \n \n \n \n \n Rainy Season Dry Season Diversity index Shannon Index Equitability Figure-7 Seasonal variation of Shannon index and equitability Research Journal of Animal, Veterinary and Fishery Sciences ________________________________________ ISSN 2320 – 6535 Vol. 1(10), 1-9, November (2013) Res. J. Animal, Veterinary and Fishery Sci. International Science Congress Association 8 Conclusion The ichtyofauna of the right bank of Malebo Pool (Congo River) collected showed great richness with 163 species belonging to 60 genera, 19 families and 8 orders. Biodiversity is important in terms of diversity index calculated during the two years of sampling, the populations of fishes of Pool Malebo right bank is slightly unbalanced because the value of equitability is fewer than 0.7. There is a decrease of equitability in July 2010, in June and July 2011 which indicate a heterogeneous distribution of fishes communities during these months. We have noticed the important relative specific abundance of clypeobarbus pleuropholis. The results of these investigations will give ichthyological reference data of the ichtyofauna of right bank of Pool Malebo (Congo River) and enrich the national directory of ichtyofauna. Aknowledgements We thank Prof. B. Evayoulou ENS, Marien Ngouabi University, Brazzaville, Congo, for his comments and suggestions. References 1.Pandey G., Overviews on Diversity of fish, Res. J. Animal, Veterinary and Fishery Sci., ), 12-18 (2013) 2.Mounolou J.C. et Levêque C., Biodiversité, dynamique biologique et conservation. 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Vouidibio,Données préliminaires sur l’ichtyofaune de la basseAlima (bassin du Congo), Mbongui, revue pluridisciplinaire de recherche université Marien Ngouabi : 39-52 (2006)24.Ibala Zamba A., Faune des poissons des rivières Luki et Lefini (Bassin du Congo) : Diversité et Ecologie, Thèse de doctorat (PhD) en Sciences. Université de Leuven, 452 (2010)