Parámetros morfométricos en el rendimiento de los componentes corporales de tilápia del Nilo (Oreochromis niloticus)

Abstract

The aim of this experiment was to study the infl uence 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 m3). During fi sh 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 fi rst ray of the dorsal and anal fi ns and on the anterior circunference of the caudal peduncle as well as the head and standard lengths were obtained. In addition, fi sh were weighted and dissected for obtaining the weights and yields of scales, fi ns, viscera, head, carcass, skin, fi llet and residue. The correlation and grouping analysis of the data obtained revealed a low association degree between the morphometric measurements with the yelds 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 yelds as related with the morphometric relationship by backward method. The relation between the fi rst-ray anal fi n width and CP (LC2/CP) and between the fi rst-ray dorsal fi n and LC2 (AC1/LC2) were related to carcass (RCAR) and fi llet (RFSP) yields, respectively. These yields were estimated as, RCAR = 43.2426 + 79.6399 LC2/CP (R2=0.096) and RFSP = 36.028 – 1.7415 AC1/LC2 (R2 = 0,014). The morphometric relationship was that better explained the yeld of body components had have the measurements LC2/CP and AC1/LC2, respectively, of the carcass and fi llet yelds.