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Diversity and distribution of fishes of Gaji River, Bauchi State, Nigeria

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Author(s): Ahmad J. Nayaya | M. Nor Siti-Azizah | Innocent A. Adikwu | Williams A. Istifanus | Abalis G. Ezra | Zainal A. Muchlisin

Journal: Advances in Environmental Sciences
ISSN 2066-7620

Volume: 4;
Issue: 2;
Start page: 50;
Date: 2012;
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Keywords: Nigeria | haplotype | PCR | fish diversity. Introduction. In Africa fish is an important source

ABSTRACT
Fish sampling was conducted along the Gaji River with a view to assessing the Diversity andDistribution of the fishes. The river which is the major source of water for the diverse wild fauna in andaround the Yankari National Park, is located on Latitude 9o 45’ 16” and Longitude 10o 30’ 37” andcovers an area of about 2,244 km² (870 mi²) and is home to several natural warm water springs, aswell as a wide variety of flora and fauna (Wikipedia 2011). A total of twenty sampling locations wereestablished on the river and throughout the period of the work, different fishing gears which includedcast nets, gill nets, entrance traps, hooks and line and in some cases seines were used. Furthermore,Mitochondrial DNA cytochrome b sequencing was employed to study the genetic diversity of Clariasgariepinus sampled from the study area due to its economic importance. Amplification of thecytochrome b (cyt b) gene was done using the polymerase chain reaction (PCR). A portion of mtDNAcontaining the gene was amplified using primers L15267, 5’-AAT GAC TTG AAG AAC CAC CGT-3’ andH15891, 5’-GTT TGA TCC CGT TTC GTG TA-3’ described by Briolay et al (1998). A total of 13 specieswere identified from the 4,218 individuals collected, representing 12 families and 13 genera. Theirpercentage distribution showed that Oreochromis niloticus had the highest percentage occurrence ofabout 31% followed by Parachanna obscura with 27%. This was followed by Clarias gariepinus whichhad about 20% distribution of occurrence. On the distribution of the identified species in the varioussampling locations, Ruwan Bangiya had the highest occurrence of the different species with 11 out ofthe total 13 species found in this location. Ruwan Dinya, Ruwan Sarki and Ruwan Gajin Gwaza also hadrelatively high occurrence of the identified fish species. The lowest occurrence was found in RuwanDalamiri, Ruwan Kunkuru and Ruwan Kankwana. Ruwan Gada and Ruwan Kakkida had moderatedistribution of the various species. Three haplotypes were identified and the result further showed thatpopulation distribution of C. gariepinus is homogenous throughout the study area during the studyperiod. The mean genetic distance between all populations is low indicating that frequent gene flowoccurs between all populations.
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