Abstract
The nutritional qualities and concentration of trace metals (Pb, Fe, Cu, Zn, and Cd) in six fishes (Hemichromis fasciatus, Siluranodon auritus, Sarotherodon galileaus, Tilapia zilli,Chrysichthys nigrodigitatus, and Hepsetus odoe) obtained from Oba reservoir in Ogbomoso, Nigeria were evaluated. The value ranges of 55.95 to 68.80, 16.91 to 26.18, 5.46 to 18.18, 0.51 to 9.05, 7.67 to 10.14 and 0.97 to 1.41% were obtained for moisture, protein, fat, carbohydrate, ash and fibre contents, respectively. Highest protein and fat contents were obtained from H. odoe. The trace metals in fishes were found at various concentrations (P≤0.05). High levels of essential metals; Fe, Cu and Zn, were found in the fishes. The concentrations of Pb and Cd were also high in the fishes, but not detected in the water sample from the reservoir. A positive correlation was observed between fat and fibre (P≤0.01) as well as Zn and Pb (P≤0.05) while fat and iron were negatively correlated. The results show that the fishes evaluated are rich in essential nutrients. However, prior exposure of the fishes to pollutants was not unlikely as shown by Pb and Cd levels. There is the need to initiate further study to identify sources of these pollutants and their effects on biota from Oba reservoir. Key words: Fish, nutrient, environment, pollutant, reservoir.
Highlights
Fish is widely acceptable in global menu due to its palatability, low cholesterol level and tenderness of its flesh (Eyo, 2001)
The protein values obtained for the fishes showed that H. odoe and H. fasciatus had similar values which were significantly higher than in S. auriatus, T. zilli, S. auriatus and C. nigrodigitatus but similar to S. galilaeus
The values of fat content of all the six species were in the order of H. odoe > H. fasciatus > S. auritus > S. galilaeus > C. nigrodigitatus > T. zilli, with significant difference among the values except those obtained for C. nigrodigitatus, S. galilaeus and T. zilli
Summary
Fish is widely acceptable in global menu due to its palatability, low cholesterol level and tenderness of its flesh (Eyo, 2001). It receives an increased level of attention because of its potential source of animal protein and some essential nutrients for human diets (Zenebe et al, 1998). It is the cheapest source of animal protein and other nutrient required in human diets. The feeding habit of an individual fish species greatly affects its body nutrient composition
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