Comparative study on nutrient contents of native and hybrid Koi (Anabas testudineus) and Pangas (Pangasius pangasius, Pangasius hypophthalmus) fish in Bangladesh.
The proximate composition, heavy metals, minerals and amino acid profile were determined for the two species of native and hybrid fishes (Anabas testudineus, Pangasius pangasius, Pangasius hypophthalmus) from different local market of Dhaka city of Bangladesh. In the proximate composition, higher amount of protein 20.22±1.94% and fat 11.28±1.35% found in hybrid Koi in contrast of protein 18.05±1.06% and fat 8.64±0.56% of native Koi, whereas native Pangas showed higher protein 26.06±1.27% and fat 14.79±2.47 % than protein 23.18±2.11% and fat 11.11±1.75% of hybrid Pangas. Minerals included Zn, Na, Ca, K, Fe, Cu, Mg and Al was higher in native species. The distribution of heavy metal: Pb, Hg, Cd and As were not significantly differed at p<0.05 in native and hybrid fishes; except Cr in Pangas. The concentrations of all heavy metals were below toxic levels. A total of fourteen amino acids were identified and mean value of lysine, leucine, valine, methionine, threonine, serine, glutamic acid, glycine and arginine in native and hybrid Koi showed the significant differences (p<0.05). In case of Pangas fish lysine, isoleucine, valine, threonine, histidine, aspartic acid, glutamic acid, glycine, alanine and tyrosine in native and hybrid Panagas significantly differed (p<0.05). The overall results indicated that hybrid Koi is better than native Koi; whereas native Pangas is well again than hybrid Pangas in addition to good dietetic fish food.