Bacteria Associated with Some Freshwater Fishes in Dangana Lake Lapai, Nigeria.

Abstract

The prevalence of bacteria associated with some freshwater fishes in Dangana Lake were studied. A total of 184 fishes belonging to four species were investigated which were Clarias gariepinus, Tilapia zilli, Oreochromis nilocticus, and Leptocypris nilocticus. Pour plate and surface streaking techniques were used. Identification and characterization of various isolates were based on gram staining technique and some biochemical tests. From the sampled fishes the total mean colony count of dilution factors (106 107 108) for Clarias gariepinus body were 49.00±3.58×, 48.20±4.15, and 47.00±1.58cfu/ml, Clarias gariepinus gill 51.00±4.67, 50.20±3.68, 44.20±1.68cfu/ml and in Tilapia zilli body 49.20±5.08,42.60±2.36,44.40±2.04cfu/ml and in the gill show a mean population of 46.00±6.70 43.20±3.733 48.20±2.54 cfu/ml. Oreochromis nilocticus body 54.30±6.38, 59.00±3.78, and 39.60±3.18 were the gill show a mean population of 43.00±7.37, 53.60±6.98cfu/ml, and 48.00±.1.15cfu/ml. The means population of Leptocypris nilocticus body 56.40±3.23, 47.20±1.77, and 48.00×±3.16 cfu/ml. Total of 6 bacteria species were isolated and identified from the gill and bodies of the fish, they include Staphylococcus aureus, Bacillus sp., Pseudomonas sp., Klebsiella sp., Proteus sp. and Micrococcus sp. The study revealed that aquaculture products are prone to attack by different groups of microorganisms.