Morphometric measurements in weight and body component yield of the Nile tilapia (Oreochromis niloticus). / Medidas morfomÃtricas no peso e rendimento de componentes corporais de TilÃpia do Nilo (Oreochromis niloticus)

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The aim of this experiment was to study the influence of the morphometric measurements on characteristics of weight and on body yields of Nile tilapia (Oreochromis niloticus) an experiment was conducted in the pisciculture sector of the Federal University of Lavras MG Fingerlings of the Supreme and the Chitralada strains with an initial weight of 0.5 a 1.0 g were stocked and reared separately in two ponds (40 m2) During fish growth, samples were taken in 78 individuals of the Supreme strain and 93 of the Chitralada Measurements of height width and perimeters on the regions of the first ray of the dorsal and anal fins and on the anterior circunference of the caudal peduncle as well as the head and standard lengths were obtained In addition fish were weighted and dissected for obtaining the weights and yields of scales fins viscera head carcass skin fillet and residue The correlation and grouping analysis of the data obtained revealed a high association degree between the morphometric measures and of these with the weights of body components There was a similarity between head and standard lengths and between height and perimeter of each region The regression analysis was accomplished for body weight as related with the morphometric measurements and backward method Equations with high determination coefficients were obtained The width obtained at the anterior circunference of caudal peduncle (LC3) and the standard length (CP) were the most related measurements with carcass weight (PCAR) and fillet (PFSP) These correlations can be expressed as PCAR = - 292.722 + 20.5694 CP + 95.0037 LC3 (R2 = 0,92) and PFSP = -193.237 + 13.3270 CP + 59.3391 LC3 (R2 = 0.90) The yields of body components were poorly associated with morphometic measurements but more related to the morphometric relationships In the regression analysis realization to yields the relation between the first-ray anal fin width and CP (LC2/CP) and between the first-ray dorsal fin and LC2 (AC1/LC2) were related to carcass (RCAR) and fillet (RFSP) yields, respectively These yields were estimated as, RCAR = 43.2426 + 79.6399 LC2/CP (R2=0.096) and RFSP = 36.028 â 1.7415 AC1/LC2 (R2 = 0.,014) The variations of morphometric measurements weights and body yields were evaluated by comparison of means F test (P<0.05) In general there was a variation on weights and body yields as well as the correlated measurements with this chacacteristics between Chitralada and Supreme strains It suggest that these measurements can be used predict weight and body yields In accordance with procedures utilized it can be concluded that the morphometric measurements can be utilized in the prediction of the body weights CP and LC3 can be used to evaluate fillet and carcass weights and LC2/CP and AC1/LC2 can be used respectively in the evaluation of the carcass and fillet yield

ASSUNTO(S)

morfometria multiple regression correlation carcass carcaÃa correlaÃÃo morphometry aquicultura regressÃo mÃltipla

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