Morphometrics, fillet yield and fillet composition in Nile tilapia, Oreochromis niloticus, strains thai chitralada, Brazil local and their hybrid
DOI:
https://doi.org/10.5433/1679-0359.2006v27n1p125Keywords:
Oreochromis niloticus, Nile tilapia, Fillet yield, Fillet composition, Morphometric reasons.Abstract
Morphometrics, fillet yield and fillet composition differences were researched in Nile tilapia, Oreochromis niloticus, strain thai-chitralada (Tai), Brazil (Local) Northern Paraná and their hybrid (Hbr, male Thailand x Brazilians female ). The experiment was designed entirely randomly with three treatments (strains) and three repetitions per treatment in hapa nets in ponds. The initial weights were 0.39 ± 0.20, 0.45 ± 0.22 and 0.41 ± 0.15 g for the strains Tai, Bras and Hbr, respectively. At the end of the experiment, the weights were 650.67, 534.25 and 360.00 g for the same previous sequence, with statistically significant differences between groups (P < 0.05). Four morphometric proportions were established to characterise each group. For the ratio (head height)/(head length), the Tai strain was largest (P < 0.05) as compared to the two other strains. The other morphometric proportions were not different (P > 0.05). The strain Hbr produced (P < 0.05) greater fillet yield (39.05%) when compared to Local (38.00 %) and Tai (36.51 %), the latter two were not different from each other (P > 0.05). Considering fillet composition, Local strain had the least crude lipid content of (1.88 %), as compared to Hbr (2.44 %) and Tai (2.96 %) which were significantly different (P<0.05). Crude protein, ash and moisture of the fillets were not different (P> 0.05).
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