Abidemi-Iromini, A.O.* and Fofah, O.J.

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The occurrence, load and prevalence of bacterial flora were investigated on Sarotherodon malarotheron tilapia fish and Chrysichthys nigrodigitatus catfish collected from Lagos Lagoon. The skin, gills and intestines were subjected to bacteriology examination. A total of fourteen (14) bacteria species were recovered; namely: (Enterobacter spp., Pseudomonas spp., Proteus spp., Escherichia coli, Klebsiella spp., Salmonella spp., Serratia spp., Micrococcus leteus, Staphylococcus aureus, Actinomyces spp., Streptococcus feacalis, Lactobacillus spp., Staphylococcus epidermidis, and Bacillus spp.). Twelve (12) bacteria were isolated from S. malarotheron, while eleven (11) bacteria flora were recovered from C. nigrodigitus. Highest bacteria recovery was in intestine (46.2%), 33.3% in gills and 20.5% in skin for the fish species. Bacteria recoveries for both species were similar except for Lactobacillus spp which occurred only in tilapia fish. Descriptive statistical analysis used indicated significant (P > 0.05) ralationship in bacteria recovery among species of fish and in the respective organs examined. Keywords: Sarotherodon malarotheron, Chrysichthys nigrodigitatus, Bacteria occurrence, Lagos Lagoon.