International Research Journal of Environment Sciences________________________________ ISSN 2319–1414Vol. 3(2), 36-47, February (2014) Int. Res. J. Environment Sci. International Science Congress Association 36 Ichtyofaunal Diversity of the Rigth bank of Congo River (Pool Malebo), CongoMady-Goma Dirat I., Mikia M.1,2, Tsoumou A.1,2 and Vouidibio J.Laboratory of Animal Biology Research and Ecology, ENS, University Marien Ngouabi, PoB 69 Brazzaville, CONGO Faculty of Sciences and Techniques, University Marien Ngouabi, PoB 69 Brazzaville, CONGO Available online at: www.isca.in, www.isca.me Received 9th January 2014, revised 17th January 2014, accepted 16th February 2014 AbstractThe present study was carried out in three stations (Kintele, Chacona and Port Leon) of the right bank of Congo River (Pool-Malebo) from January 2010 to December 2011. Monthly variations of physicochemical parameters and fish fauna diversity were observed. Among physiochemical parameters measured, conductivity and Total Dissolved Solid(TDS) varied following stations and months. 19317 specimens identified belonging to 165 species, 60 genera, 19 families and 8 orders. Shannon diversity index and equitability vary following prospection site and season. The relative specific abundance varies also following station and season. The most abundant species were Micralestes acutidens (16%)atKintele (station1),Ctenochromis polli (15%)andClypeobarbus pleuropholis(14%) at Chacona (station 2). Clypeobarbus pleuropholis (35%) dominate the collection of Port Leon (station 3). The present study will provide a database for conservation and fisheries departments to help them for a good management of icthyofauna conservation of Congo River. Keywords: Congo River, ichthyofauna, physicochemical parameters, shannon index, equitability. Introduction The main threats to human activities weighing on biodiversity identified by the International Union for Conservation of Nature (IUCN) included destruction of habitat, fragmentation of habitat, habitat degradation (including that related to pollution), climate change, overexploitation of species, invasive exotic species and diseases spread. This leads an acceleration of process of hinders to protect biodiversity2,3. Fish diversity has been declined to greater extent due to destruction of habitat both by natural and anthropogenic factors. Fish is used as a significant source of protein for millions of people around the world. Fishes inventory is important for knowledge of fishes populations. Studies of spatial and temporal patterns of diversity, distribution and composition of freshwater fishes are useful to examine different factors that influence the structure of the fish community. Fishes are also an important indicator of ecological health and the abundance and health of fish will show the health of water bodies. Data so obtained will helps the environmentalist and policy makers to determine what course of action to be hepfull for the proper management and protection of fishes. Fish fauna of the right bank of the Congo basin is poorly known. There are two decades a baseline study which summarized some studies on Congo Basin have been conducted. The assessment of the icthyofaunal diversity of the right bank of the Congo Basin is underway last ten years, through differents works conducted to inventory fish fauna of the right bank tributaries of Congo River: in the Mambili River ; in Alima River ; in Likouala aux herbes10; in right bank of Congo River (Pool Malebo)11; in Lefini River12 ; in Djiri River13. In present study, attempts have been made to collect, classify and identify fishes of right bank of Congo River (Pool-Malebo). Material and MethodsSampling of ichtyofauna was realized monthly with the castnet in three stations (Kintele, Chacona and Port Leon) located on the right bank of Pool-Malebo (Congo River) from january 2010 to december 2011 (figure-1). Five physicochemical parameters were measured (air temperature, surface water temperature, pH, conductivity and TDS), fishes has been collected using cast net, specimens after fixation in formalin 10% are preserved in alcohol 70%. Fishes so collected are identified using different keys available8,14,15,16,17,18,19,20 and were classified following the Cloffa order21,22,23. The diversity of fishes was calculated by Shannon index24 and equitability was deducted by Pielou's index25. Results and Discussion Physicochemical parameters: Air temperature: Observations made during two successive years indicated that air temperature in all stations fluctuate between 25°C and (figure-2). The lowest values were observed in April-May 2010 to April 2011 at Chacona and Port Leon. Higher air temperatures were recorded in March 2010 at Kintele and Chacona. The temperature of the surface water varied in the same manner in all stations (figure-3), the temperature varied between 26.5°C and 30.5°C. The lowest water temperatures in the three stations (26.5°C) are observed in July. The highest values were recorded at Kintele in February 2010 and in March 2011.pH: During the two years, the evolution of pH values seemed to be the same in all stations, the pH rose from February to September and began decrease in October, November and December. A slight decrease was observed in May and June 2010 in the three International Research Journal of Environment Sciences______________________________________________ ISSN 2319–1414 Vol. 3(1), 36-47, February (2014) Int. Res. J. Environment Sci. International Science Congress Association 37 stations, the same tendancy was observed at Chacona and Port Leon in May 2011(figure-4). Total Dissolved Solid (TDS): The TDS values in the 3 stations superimposed monthly with a sharp fall in February 2010 (figure-5). Apart from this zero, the lower values were 10ppm at Chacona in January 2010 and Port Leon in December 2011. The biggest value (110ppm) observed at Port Leon in April 2011. Two peaks of low amplitude were recorded at the same station in October 2010 (43ppm) and January 2011 (32ppm). Conductivity: Conductivity changed in the same way that the TDS, a sudden drop in conductivity is also observed in February 2010 in the three stations (figure-6). The minimum values were 20µS/cm) at Chacona in January 2010 and Port Leon in December 2011. The maximum value (218µS/cm) observed at Port Leon in April 2011. Two peaks of low amplitude were recorded at the same station in October 2010 (88µS/cm) and January 2011 (65 µS/cm). Ichtyofauna composition: Monthly sampling of ichtyofauna was realized from January 2010 to December 2011 with the castnet in three stations (Kintele, Chacona and Port Leon), permitted to identify 19 317 specimens belonging to 165 species, 60 genera, 19 families and 8 orders.The table-1 showed ichtyofauna composition in the three sampling stations. Figure-1 Sampling Area Figure-2 Spatiotemporal variation of air temperature International Research Journal of Environment Sciences______________________________________________ ISSN 2319–1414 Vol. 3(1), 36-47, February (2014) Int. Res. J. Environment Sci. International Science Congress Association 38 Figure-3 Spatiotemporal variation of temperature of the surface water Figure-4 Spatiotemporal variation of pH Figure-5 Spatiotemporal variation of TDS International Research Journal of Environment Sciences______________________________________________ ISSN 2319–1414 Vol. 3(1), 36-47, February (2014) Int. Res. J. Environment Sci. International Science Congress Association 39 Figure-6 Spatiotemporal variation of conductivity Table-1 List of identified species (January 2010-December 2011) Order and Family N° SpeciesCode St1 St2 St3 Osteoglossiformes Notopteridae 1 Xenomystus nigri (Günther, 1868) XMN+ + - Mormyridae 2 Campylomormyrus elephas(Boulenger, 1898) CME - + - 3 Campylomormyrus mirus (Boulenger, 1898) CMI + + - 4 Campylomormyrus sp CMS + + + 5 Campylomormyrus tamandua (Günther, 1868) CLT + + + 6 Cyphomyrus discorhynchus (Peters, 1852) CMD + + - 7 Cyphomyrus macrops (Boulenger, 1909) CMM + + + 8 Cyphomyrus psittacus (Boulenger, 1897) CMP + + + 9 Cyphomyrus sp1 CPM + - - 10 Cyphomyrus sp2 CPR + - - 11 Genyomyrus donnyi Boulenger, 1898GMD + + + 12 Gnathonemus petersi (Günther, 1862)GNP + + + 13 Gnathonemus sp GNS + + + 14 Marcusenius greshoffi MCG - + + 15 Marcusenius intermedius Pellegrin, 1924MCI + + - 16 Marcusenius kutuensis (Boulenger, 1899)MCK + + - 17 Marcusenius m. angolense (Boulenger, 1905) MMA + + + 18 Marcusenius moorii (Günther, 1867) MCM + + + 19 Marcusenius schuiltuisiae (Boulenger, 1899)MST - + + 20 Marcusenius sp MSP + + - 21 Marcusenius stanleyanus (Boulenger, 1897) MSL + + + 22 Mormyrops anguilloïdes (Linné, 1758) MMA - + + 23 Mormyrops sp MMR + + + 24 Mormyrus bombanus Boulenger, 1909 MMB + - - 25 Mormyrus caballus Boulenger, 1898 MMC + + - 26 Mormyrus longirostris Peters, 1852 MML + - - 27 Mormyrus ovis Boulenger, 1898 MMO + + - 28 Mormyrus sp MMU + + - 29 Myomurus macrodon Boulenger, 1898 MMD + + - International Research Journal of Environment Sciences______________________________________________ ISSN 2319–1414 Vol. 3(1), 36-47, February (2014) Int. Res. J. Environment Sci. International Science Congress Association 40 30 Petrocephalus balayi Sauvage, 1883 PPB - + - 31 Petrocephalus bane (Lacépède, 1803) PCB - + - 32 Petrocephalus chrysti Boulenger, 1920 PCC + + + 33 Petrocephalus microphtalmus Pellegrin, 1908 PCM + + - 34 Petrocephalus sauvagi Boulenger, 1887 PTS + + - 35 Petrocephalus simus Sauvage 1879 PCS + + + 36 Petrocephalus sp1 PCP + + + 37 Petrocephalus sp2 PTC + - + 38 Pollimyrus nigripinnis (Boulenger, 1899) PMP + + + 39 Pollimyrus sp PMS + + + 40 Stomatorhinus fulginosus Poll, 1941 STF + - - 41 Stomatorhinus sp STS + - - Clupeiformes Clupeidae 42 Microthrissa congica MTC + - - 43 Microthrissa sp MTS + - + 44 Odaxothrissa sp OTS + + + 45 Pellonulla leonensis Boulenger, 1916 PNL + + + 46 Pellonulla vorax Günther, 1868 PNV + + + Gonorhynchiformes Chanidae 47 Parachanna insignis PCI + + + Cypriniformes Cyprinidae 48 Clypeobarbus pleuropholis Boulenger, 1899 CBP + + + 49 Labeo cyclorhynchus Boulenger, 1899 LCR + + + 50 Labeo greeni Boulenger, 1902 LGN - + + 51 Labeo lineatus Boulenger, 1898 LLT + + + 52 Labeo lualuabaensis LBL - + - 53 Labeo nasus Boulenger, 1899 LNS + + - 54 Labeo parvus Boulenger, 1902 LBP + + - 55 Labeo sp1 noir LBC + + - 56 Labeo sp2 LBN - + - 57 Labeo sp3 LBO - + - 58 Labeo velifer Boulenger, 1898 LVF + + + 59 Labeo weeksi Boulenger, 1909 LWK + + + 60 Leptocypris lujae Boulenger, 1909 LCL + + + 61 Leptocypris weeksi (Boulenger, 1899) LCW + + + 62 Raïamas buchholzi (Peters, 1877) RAB + + + 63 Raïamas chrysti (Boulenger, 1920) RAC + + - Characiformes Alestidae 64 Alestes liebrechtsi Boulenger, 1898 ALT + + + 65 Alestopetersius sp APS + + 66 Brycinus comptus Roberts et Stewart, 1976 BCP + + + 67 Brycinus imberi Peters, 1852 BCI + + + 68 Brycinus macrolepidotus (Valenciennes, 1849) BML + + + 69 Brycinus poptae Pellegrin, 1906 BPP + + + 70 Brycinus sp BCS - - + 71 Bryconaethiops macrops Boulenger, 1920 BAC + - - 72 Bryconaethiops microstoma Günther, 1873 BAM + + + 73 Duboisialestes bifascatus Poll,1967 DAB + - - 74 Duboisialestes tumbense Hoedeman, 1951 DAT + - + 75 Hydrocynus forskali (Cuvier, 1819) HCF - - + 76 Hydrocynus vittatus (Castelnau, 1861) HCV + - + 77 Micralestes acutidens (Peters, 1852) MAT + + + 78 Micralestes occidentalis (Günther, 1899) MCO + - - International Research Journal of Environment Sciences______________________________________________ ISSN 2319–1414 Vol. 3(1), 36-47, February (2014) Int. Res. J. Environment Sci. International Science Congress Association 41 79 Micralestes stormsi Boulenger, 1902 MSM + + + 80 Micralestes sp MAS + + + 81 Phenacogrammus interruptus (Boulenger, 1899)PGI + - + Citharinidae 82 Citharinus congicus Boulenger, 1897 CTC - + + 83 Citharinus gibbosus Boulenger, 1899 CTG + - + 84 Citharinus latus Muller et Troschel, 1845 CTL + - - 85 Citharinus macrolepis Boulenger, 1899 CTM - + - 86 Citharinus sp CTS + - + Distichodontidae 87 Belanophago hutsebauti Giltay, 1929 BPH + - - 88 Belanophago tinanti Poll, 1939 BPT + - - 89 Distichodus affinis Günther, 1873 DCA + + + 90 Distichodus altus Boulenger, 1899 DCF + + + 91 Distichodus antonii Schilthuis, 1891 DCT - + - 92 Distichodus atroventralis Boulenger, 1898 DCN - + + 93 Distichodus fasciolatus Boulenger, 1898 DCC + + + 94 Distichodus lussosso Schilthuis, 1891 DCL - + - 95 Distichodus notospilus Günther, 1867 DCO - + + 96 Distichodus sexfasciatus Boulenger, 1897 DCS + + + 97 Distichodus sp DCP - - + 98 Hemistichodus cf mesmaekersi Poll, 1959 HSM - + - 99 Non identifié NIF - + - 100 Ichtyborus ornatus (Boulenger, 1899) IBO + + + 101 Mesoborus crocodilus Pellegrin, 1900 MSC - + + 102 Nannocharax macropterus Pellegrin, 1926 NCM + - - 103 Nannocharax gracilis Poll, 1939NCX - - + 104 Nannocharax sp NCG + + + 105 Phago boulengeri Schilthuis, 1891PBL + + + 106 Xenocharax sp XCS - - + Siluriformes Claroteidae 107 Auchenoglanis occidentalis (Valenciennes, 1840) AGO + + - 108 Chrysichthys longibarbis (Boulenger, 1899) CIL + - - 109 Chrysichthys ornatus Boulenger, 1902 CIO + + + 110 Chrysichthys punctatus Boulenger, 1899 CIP + - - 111 Chrysichthys sp 1 CIS + + + 112 Chrysichthys sp2 CIT + - - 113 Chrysichthys thonneri Steindachner, 1912 CIH + + + 114 Parauchenoglanis sp PCG - + - Schilbeidae 115 Parailia congica Boulenger, 1899PLC + - + 116 Schilbe grenfelli (Boulenger, 1900) SGF + + - 117 Schilbe intermedius Rüppell, 1832 SIT + + + Amphiliidae 118 Belanoglanis tenius Boulenger, 1902 BGT - + - Clariidae 119 Clarias gariepinus (Burchell, 1822) CGP - + + 120 Clarias sp1 CRS - + + 121 Clarias sp2 CRP - - + Malapteruridae 122 Malapterurus electricus (Gmelin, 1789) MPE - - + 123 Malapterurus microstoma Poll et Gosse, 1969 MPM + + + 124 Malapterurus sp MPS + - + Mockokidae 125 Microsynodontis sp MSD + + - 126 Synodontis alberti Schilthuis, 1891 SDA + + + 127 Synodontis caudalis Boulenger, 1899 SCD - + - 128 Synodontis congicus Poll, 1971 SDG + - + 129 Synodontis decorus Boulenger, 1899SDD - + + 130 Synodontis nigriventris David,1936 SNV + + + International Research Journal of Environment Sciences______________________________________________ ISSN 2319–1414 Vol. 3(1), 36-47, February (2014) Int. Res. J. Environment Sci. International Science Congress Association 42 131 Synodontis notatus Vaillant, 1893 SNT + + + 132 Synodontis nummifer Boulenger, 1899 SNM + + + 133 Synodontis schoutedeni David,1936 SST + + + 134 Synodontis sp1 SDC + + - 135 Synodontis sp2 SDS + + - 136 Synodontis sp3 SDT + - - Synbrachiformes Mastacembelidae 137 Mastacembelus congicus (Boulenger, 1896) MCC - + - Perciformes Centropomidae 138 Lates niloticus (Linneaus, 1758) LNT - + - Cichlidae140 Ctenochomis polli Thys Van Audenaerde, 1964 CCP + + + 141 Ctenochromis sp CCS - + + 143 Hemichromis elongatus (Guichenot, 1859) HCE + + + 144 Hemichromis sp HCM + + + 145 Hemichromis stellifer Loiselle, 1979 HCS + + + 146 Lamprologus casuerus LPM + + + 147 Lamprologus mocquardi Pellegrin, 1903 LPC + - + 149 Lamprologus sp1 LPS - + + 150 Lamprologus sp2 LPL - - + 151 Nannochromis sp NCS - - + 152 Oreochromis niloticus Linneaus, 1758 OCN - + + 153 Sarotherodon boulengeri Pellegrin, 1903 STB + + + 154 Sarotherodon galileus Linneaus, 1758 STG + + + 155 Sarotherodon sp STD - - + 156 Tilapia tholloni (Sauvage, 1884) TTL + + + 157 Tilapia sp TLS - + + 158 Tylochromis lateralis (Boulenger, 1898) TCL + + + 159 Tilapia zilli (Gervais, 1848) TTZ + + + 160 Tylochromis sp TCS + + + Anabantidae 161 Ctenopoma acutirostre Pellegrin, 1898CPA - + - 162 Ctenopoma nebulosum Norris et Teugels, 1990 CPN + - - Tetraodontiformes Tetraodontidae 163 Tetraodon mbu Boulenger, 1899 TOB - - + 164 Tetraodon miurus Boulenger, 1898 TOM + + - 165 Tetraodon sp. TOS - + - Total species number 117 120 101 The overall specific richness is of 165 species, 117 species have been recorded in Kintélé, 120 at Chacona and 101 at Port Leon. Specific richness of orders following the stations: Kintele had 7 orders, Chacona and Port Leon counted 8 orders. Proportional representation of species classified by order is indicated in the figure-7. Two orders dominate Osteoglossiformes and Characiformes followed by Siluriformes, Perciformes, Cypriniformes and Clupeiformes. Tetraodontiformes and Synbranchiformes are the orders less represented. Many authors working on different rivers of the right bank of Congo River have found the same dominant orders: in Congo Basin; in Mambili River; in Alima River; in Congo River (Pool Malebo)11; in Lefini River12; in Djiri River13. Specific richness of families following the station: The families number obtained varied from one station to another (figures-8a,8b,8c), the largest number of families (18) was identified at Kintele, Chacona and Port Leon had 15 families. In the three stations, six families dominate the collections in variable proportions: Mormyridae, Alestidae, Cyprinidae, Cichlidae, Mockokidae and Distichodontidae. Mormyridae was the dominant family in the 3 stations, these results corroborate those realized in the Congo Basin8,9,11,12,13. Spatiotemporal variation of Shannon index and equitability: There is no seasonal variation in the Shannon index and equitability at Kintele. On the contrary, variations were observed at Chacona where Shannon index and equitability in the dry season are higher than in the rainy season. At Port Leon, trend reversed the values of diversity indices in the dry season were lower than in the rainy season (figures-9a,9b). International Research Journal of Environment Sciences______________________________________________ ISSN 2319–1414 Vol. 3(1), 36-47, February (2014) Int. Res. J. Environment Sci. International Science Congress Association 43 Figure-7 Specific richness of orders following the stations Spatiotemporal variation of relative specific abundance: The overall relative abundance specific varied following stations (figures-10a,10b,10c). Three species are abundant Kintele: Micralestes acutidens (16%), Ctenochromis polli (11%) and Tilapia tholloni (9%). A Chacona, the most abundant species were: Ctenochromis polli (15%), Clypeobarbus pleuropholis(14%) and Micralestes acutidens (9%). In Leon port, one species, Clypeobarbus pleuropholis dominated with 35%, followed by Tilapia tholloni (7%) and Schilbe intermedius(7%). The specific relative abundance also varied according to seasons, the distribution for the four main species changed from one station to another (figures-11a,11b,11c). At Kintele most abundant species was Tilapia tholloni 12%), Ctenochromis Polli(11%), Micralestes acutidens (11%) and Schilbe intermedius(9%). At Chacona, the most abundant species was Ctenochromis polli (19%) followed by Clypeobarbus pleuropholis (13%), Micralestes acutidens (10%) and Brycinus comptus (10%). The most abundant species at Port Leon, was Clypeobarbus pleuropholis (14%), Tilapia tholloni (11%), Schilbe intermedius (8%) and Sarotherodon boulengeri (6%). The difference observed at Port Leon could be explained by the water pollution caused by presence of garbage transported by Mfoa River which flows into the Congo River. In dry season, the profile changed specific relative abundancy within the same stations and between stations compared to rainy season (figures-12a,b,c). During this season, the most abundant species in Kintélé was Micralestes acutidens (19%) followed by Ctenochromis polli (10%), Tilapia tholloni (8%) and Clypeobarbus pleuropholis (8%). At chacona, the highest relative abundancy was Clypeobarbus pleuropholis (16%), Schilbe intermedius (12%), Parailia congica (6%) and Petrocephalus chrysti (5%). In Port Leon, Clypeobarbus pleuropholis was the only species that dominated with 59%. This difference could be explained by the water pollution caused by presence of garbage transported by Mfoa River which was more important during dry season. Specific affinities between stations: The hierarchical classification including the specific richness of three stations (figure-13), showed some differences between the data stemming from various sampled stations. The stations Kintele and Chacona were similar, Port Leon station was different to the two others. This difference could be explained by the presence of garbage transported by Mfoa River. Kintele 2010-2011 Mormyridae Alestidae Cyprinidae Cichlidae Mockokidae Distichodontidae Claroteidae Clupeidae Citharinidae Schilbeidae Autres Figure-8a Specific richness of families in Kintele International Research Journal of Environment Sciences______________________________________________ ISSN 2319–1414 Vol. 3(1), 36-47, February (2014) Int. Res. J. Environment Sci. International Science Congress Association 44 Chacona 2010-2011 Mormyridae Cyprinidae Cichlidae Distichodontidae Alestidae Mockokidae Claroteidae Clupeidae Schilbeidae Citharinidae Figure-8b Specific richness of families in Chacona  Port Leon 2010-2011 Mormyridae Cichlidae Alestidae Distichodontidae Cyprinidae Mockokidae Clupeidae Claroteidae Citharinidae Malapteruridae Figure-8c Specific richness of families in Port Leon 0123456 Kintele Chacona Port Leon Shannon index Rainy season Dry season Figure-9a Spatiotemporal variation of Shannon index \n\n\n\n\n\n \n\nKinteleChaconaPort LeonEquitability Rainy season Dry season Figure-9b Spatiotemporal variation of equitability  \r\r \r\r\r\r\r\r\r\r\r\r\r\r\r\rKintele 2010-2011 Micralestes acutidens Ctenochomis polli Tilapia tholloni Schilbe intermedius Clypeobarbus pleuropholis Brycinus comptus Sarotherodon boulengeri Cyphomyrus macrops Pellonulla leonensis Synodontis nummifer Bryconaethiops macrops Petrocephalus chrysti Parailia congica Petrocephalus simus Tylochromis lateralis Figure 10a Globalspatiotemporal variation of relative specific abundance in Kintele \r\r \r \r\r \r\r\r\r\r\r\r\r\r\rChacona 2010-2011 Ctenochomis polli Clypeobarbus pleuropholis Micralestes acutidens Brycinus comptus Schilbe intermedius Tilapia tholloni Petrocephalus chrysti Sarotherodon boulengeri Petrocephalus microphtalmus Leptocypris weeksi Hemchromis elongatus Tylochromis lateralis Synodontis nigriventris Cyphomyrus macrops Parailia congica Figure 10b Globalspatiotemporal variation of relative specific abundance in Chacona \r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\rPort Léon 2010-2011 Clypeobarbus pleuropholis Tilapia tholloni Schilbe intermedius Ctenochomis polli Sarotherodon boulengeri Micralestes acutidens Hemichromis elongatus Synodontis nummifer Brycinus imberi Labeo lineatus Brycinus comptus Microthrissa sp Petrocephalus chrysti Marcusenius greshoffi Cyphomyrus macrops Odaxothrissa sp Figure 10c Globalspatiotemporal variation of relative specific abundance i Port Leon International Research Journal of Environment Sciences______________________________________________ ISSN 2319–1414 Vol. 3(1), 36-47, February (2014) Int. Res. J. Environment Sci. International Science Congress Association 45 \r\r\r \r \r\r\r\r\r\r\r\r\r\r\rKintele rainy season 2010-2011 Tilapia tholloni Ctenochomis polli Micralestes acutidens Schilbe intermedius Brycinus comptus Parailia congica Clypeobarbus pleuropholis Sarotherodon boulengeri Cyphomyrus macrops Figure-11a Variation of relative specific abundance during rainy season in Kintele  \r\r\r\r\r \r\r\r\r\r\r\r\r\r\rChacona rainy season 2010-2011 Ctenochromis polli Clypeobarbus pleuropholis Micralestes acutidens Brycinus comptus Tilapia tholloni Schilbe intermedius Sarotherodon boulengeri Tylchromis lateralis Figure-11b Variation of relative specific abundance during rainy season in Chacona \r\r\r \r\r\r\r\r\r\r\r\r\r\r\r\rPort Leon rainy season 2010-2011 Clypeobarbus pleuropholis Tilapia tholloni Schilbe intermedius Sarotherodon boulengeri Microthrissa sp Micralestes acutidens Brycinus comptus Ctenochomis polli Hemichromis elongatus Brycinus imberi Labeo lineatus Synodontis nummifer Petrocephalus chrysti Cyphomyrus macrops Tylochromis lateralis Figure-11c Variation of relative specific abundance during rainy season in Port Leon  \r\r\r\r\r \r\r\r\r\r\r\r\r\r\r\rKintele dry season 2010-2011 Micralestes acutidens Ctenochomis polli Tilapia tholloni Clypeobarbus pleuropholis Schilbe intermedius Brycinus comptus Cyphomyrus macrops Sarotherodon boulengeri Pellonulla leonensis Figure-12a Variation of relative specific abundance in dry season in Kintele  \r\r \r\r\r\r\r\r\r\r\r\r\r\r\rChacona dry season 2010-2011 Clypeobarbus pleuropholis Schilbe intermedius Parailia congica Petrocephalus chrysti Cyphomyrus macrops Micralestes acutidens Brycinus comptus Synodontis nigriventris Figure-12b Variation of relative specific abundance in dry season in Chacona  \r\r\r\r\r\r\r\r\r\rPort Leon dry season 2010-2011 Clypeobarbus pleuropholis Schilbe intermedius Synodontis nummifer Odaxothrissa sp Ctenochromis polli Petrocephalus chrysti Petrocephalus chrysti Marcusenius greshoffi Schilbe intermedius Autres Figure-12c Variation of relative specific abundance in dry season in Port Leon International Research Journal of Environment Sciences______________________________________________ ISSN 2319–1414 Vol. 3(1), 36-47, February (2014) Int. Res. J. Environment Sci. International Science Congress Association 46 Figure-13 Dendrogram of specific richness in the stations ConclusionThe study of ichtyofauna diversity realized on the right bank of Pool-Malebo in three stations Kintele, Chacona and Port Leon, showed that the specific richness was greater. The fish population wass very diversified in the three stations, shannon index was superior to 4.2 in rainy season and superior to 3.5 in dry season. The values of equitability in Kintele indicated that population of this station is balanced, Chacona population is balanced in dry season but sligthly unbalanced in rainy season. Port Leon was very different than the two others by the specific richness and there was seasonal change in equitability which was less in dry season than in rainy season. The present study will provide a database for conservation and fisheries departments to help them for a good management of icthyofauna conservation of Congo River. References1.Groom M.J., Meffe G.K. and Caroll C.R. Principles of Conservation Biology, 3ed. Sinauer Associates, Sunderland, MA. (1,2,4) (2006) 2.Millenium Ecosystem Assessmant (MEA). Ecosystem and Human Well-being. 4 volumes. Island Press, Covelo, CA. (1,3,4,5,9) (2005)3.Forister M.L., McCall AC, Sanders N.J., Fordyce J.A., Thorne J.H., Waetjen D.P., Shapiro A.M. Compounded effects of climate change and habitat alteration shift patterns of butterfly diversity, Proceedings of the National Academy of Sciences of the United States of America, 107, 2088–2092 (2010) 4.Mohan V.C., Sharma K.K., Sharma A. and Watts P. The Study of Ichthyofaunal Diversity of Chenani Hydroelectric Reservoir, Udhampur (J&K) India, International Research Journal of Environment Sciences2(6), 8-12 (2013)5.Galactos K., Barriga-Salazar R. and Stewart D.J., Seasonal and habitat influences on fish communities within the lower Yasuni River basin of the Ecuadorian Amazon, Environmental Biology of Fishes., 71, 33–51 (2004) 6.Hamzah N., Assessment on water quality and biodiversity within Sungai Batu Pahat, M.phil thesis, University Teknologi Malaysia, 124 (2007) 7.Teugels G. G. et J. F. Guegan, Diversité biologique des poissons d’eaux douces de la Basse Guinée et de l’Afrique Centrale. In : Teugels G. G. et J. F. Guegan et J.J. Albaret (eds)Diversité biologique des poissons des eaux douces et saumâtres d’Afrique M.R.A.C.,Tervuern, Belgique, Ann., Scs Zoo., 272, 67-85. (1994)8.Sullivan, J.P., S. Lavoué et J.P. Friel. A la découverte des poissons du parc national d’Odzala. Canopée n° 26, 5. (2002)9.Mady-Goma Dirat I., A. Tsoumou et Vouidibio J., Données préliminaires sur l’ichtyofaune de la basse Alima (bassin du Congo). In Mbongui, revue pluridisciplinaire de recherche université Marien Ngouabi, 39-52 (2006) 10.Mamonekene V., Les ressources halieutiques de la réserve communautaire du lac Télé / Likouala aux herbes Diversité et exploitation. Rapport de consultation, 25 (2006) 11.Mady - Goma Dirat I., Mikia M., Tsoumou A., Samba G., Vouidibio J. & Pandaré D., Données préliminaires sur l’ichtyofaune de Kintélé (Pool - Malebo ). Annales de l’Université Marien Ngouabi, 51 - 62 (2008)12.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) 13.Mikia M., Etude préliminaire de l’ichtyofaune du cours inférieur de la rivière Djiri (Affluent du fleuve Congo). Mémoire de DEA Faculté des Sciences, 69 (2010)14.Levêque C., Paugy D. & Teugels G. G., Faune des poissons d’eau douce et saumâtre d’Afrique de l’Ouest. Tome 1 ; Edition de l’ORSTOM ; 384 (1990)15.Levêque C., Paugy D. & Teugels G.G., Faune des poissons d’eau douce et saumâtre d’Afrique de l’Ouest. Tome 2 ; Edition de l’ORSTOM ; 382-902 (1990) 16.Paugy D., Révision systématique des Alestes et Brycinus africains (pieces Characidae). Collection Etudes et Thèses, ORSTOM, Paris, 295 (1986) 17.Poll M. les poissons du Stanley- Pool. Annales du Musée Royal du Congo Belge, Tervuren, 60 (1939) 18.Poll M., Les genres des poissons d’eau douce d’Afrique. Ann. Mus. Royal du Congo Belge- Zool., 191, (1957) 19.Stiassny M.L.J., G.G. Teugels et C.D. Hopkins, Poissons d’eaux douces et saumâtres de la basse Guinée, Ouest de l’Afrique Centrale. Vol.1 ; Edition du MRAC, 800, (2007) International Research Journal of Environment Sciences______________________________________________ ISSN 2319–1414 Vol. 3(1), 36-47, February (2014) Int. Res. J. Environment Sci. International Science Congress Association 47 20.Lévêque C. et D. Paugy, Les poissons des eaux continentales africaines, Diversité, écologie, utilisation par l’homme. Edition de l’IRD., 564 (2006) 21.Daget J., Kid J. P. and Thys Van Den Audenaerde D. F. E. (Eds), Cloffa 1 Check list of the freshwater fishes of Africa. Volume I ISNB Brussels MRAC Tervuren Orstom Paris 410 (1986) 22.Daget J., kid J. P. and Thys Van Den Audenaerde D. F. E. (Eds), Cloffa 2 Check list of the freshwater fishes of Africa. Volume II ISNB Brussels MRAC Tervuren Orstom Paris 520 (1986) 23.Daget J., J.P. Gosse & Thys Van Den Audenaerde, Cloffa (check-list of the fresh water fishes of Africa), Volume IV; ISBN, M.R.A.C., (Tervuren) & ORSTOM 5, Paris; 533(1991) 24.Shannon C. E., Weaver, W., The mathematical theory of communication, University Illinois Press, Urbana, IL, 117 1949) 25.Pielou E. C., Ecological diversity, John Wiley, New York, 165 (1975)