International Journal of Fishery Science and Aquaculture Vol. 1 (1), pp. 001-006, September, 2013. © Advanced Scholars Journals

Full Length Research Paper

Minerals content and fatty acids profile of Nile tilapia (Oreochromis Niloticus) fillet from lake Zeway: Effect of endogenous factors

Alemu Lema Abelti

Oromia Agricultural Research Institute, Zeway Fisheries Resources Research Center,

Oromia Regional State, P.O.Box 229, Ethiopia.

E-mail:[email protected]

Accepted 9 September, 2013

Abstract

This study was aimed to investigate the influence of age and sex on minerals content and fatty acids profile of Nile Tilapia (Oreochromis niloticus) fillet. Specimens were collected from Lake Zeway during January 2011. Samples were cool transported to Food Science and Nutrition laboratory of Addis Ababa University. The concentrations of minerals were analyzed using Flame Atomic Absorption spectrophotometer and Fatty acid profile was determined using gas chromatography. Female fish contained significantly (p<0.05) higher calcium and phosphorus as compared to male. Calcium and zinc significantly (p<0.05) decreased as age of fish increased but phosphorus significantly (p<0.05) increased with increase in age of the fish. Sex had no significant effect (p>0.05) on Iron and Zinc content. Regarding to fatty acid composition, monounsaturated fatty acids constituted the largest proportion of total unsaturated fatty acids in both sexes. Oleic acid was relatively higher in female than male. Conversely, the polyunsaturated fatty acids were higher in male as compared to female.

Key words: Age, sex, minerals content, fatty acids profile, Oreochromis niloticus.