Volume : VII, Issue : VI, June - 2018

HISTOPATHOLOGY OF AFRICAN CAT FISH EXPOSED TO DIESEL OIL

Olaniyi C. O, Giwa A.

Abstract :

The devastating consequences of oil spills are felt in the whole world as well as South-South region of Nigeria being one of the largest oil producing country in the world.  Therefore, the effect of oil pollution on aquatic life has become a great concern to scientists, since much of the population is dependent upon marine and coastal ecosystems for food therefore this study was conducted to examine the lethal and sub-lethal toxicity effect of diesel oil on the hearth and gills tissue of Juvenile African catfish (Clariasgariepinus) using a renewable static bioassay.

A total number of 144 juvenile African catfish of average weight (425±0.02g ) and length 35±0.2cm  were  used for  both lethal and sub- lethal experiments Firstly, sixty fish were selected and exposed to five varying lethal concentration of diesel oil  (1000 ml, 900 ml,  600ml,700 ml, 600 ml) and control (water) for 4 days. Secondly, other set of sixty fish were exposed to five varying sub-lethal concentration of diesel (100 ml, 200 ml, 300 ml, 400 ml, 500ml) and control (water) for 14 days. Within few hours of fish exposure to lethal concentrations, all the fish died

For the fish exposed to sub lethal concentrations, no mortality was observed in treatment A (control) and treatment B (100 ml), indicating that the fishes are healthy. However, 50% mortalities were observed in treatment C (200 ml), 75% mortality in treatment D (300 ml)   and 100% mortalities were observed in treatment E (400 ml) and F (500ml) respectively.

The histological investigations of the heart and gills tissue of the fish revealed great ulceration of heart tissue and totally erode gills villi was noticed in gill tissue of test organism. The results revealed that acute oil toxicity has severe effects on the fish mortality, heart and gill structure which may be deleterious for catfish populations.

Conclusively, this study has been able to establish the fact that, exposure of juvenile African catfish (Clariasgariepinus) to even low concentration (200ml) of diesel concentration can induce various toxicological effect and histological degradation which depend on the period of exposure and concentration of toxicant.

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Article: Download PDF    DOI : https://www.doi.org/10.36106/gjra  

Cite This Article:

Olaniyi C.O, Giwa A., HISTOPATHOLOGY OF AFRICAN CAT FISH EXPOSED TO DIESEL OIL, GLOBAL JOURNAL FOR RESEARCH ANALYSIS : Volume-7 | Issue-6 | June-2018

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