DOI: 10.36347/sajb.2018.v06i07.011

Pages: 543-552

The study is an ecotoxicological evaluation of commercial fish farm in Ogbogoro (OGB), Rivers State Nigeria using micromorphological assessment of Clarias gariepenus, and African Aquaculture Centre (ARAC) as a the reference site. The sampling involved harvesting of table-sized fish: twenty fishes from OGB and ten fishes from ARAC). The micro-morphological assessment involved the determination of the qualitative and semi-quantitative analysis of the gills, Liver and kidney of the harvested fishes. Histological assessment of gills, liver and kidney showed almost same prevalence in lesion in OGB as compared to ARAC. The major histological alterations observed were circulatory disturbances (CD) which includes hyperaemia, haemorrhage, and vacuolation. Regressive change (RC) which includes necrosis and progressive change (PC). The Histological Alteration Index or Fish Index (FI) of OGB (14.7) is slightly greater than ARAC (14.6). It was concluded therefore that OGB fish farm was moderately polluted.