Determinação da curva de crescimento e alometria de pacu (Piaractus mesopotamicus), tambaqui (Colossoma macropomum) e seus híbridos

Abstract

The objective of this work was to determine the growth curve growth and the evaluation of the allometric growth of pacu (Piaractus mesopotamicus), tambaqui (Colossoma macropomum) and its hybrids. The fish were cultivated in a dry land nursery and were divided into four wells of 6 mx 11 m, remaining in the average cultivation land of 1200 g (end of the experiment), making 271 days of cultivation. Every 28 days, they were weighed and submitted to a morphometric evaluation. The non-linear regression models of Brody, Gompertz, Logistic and Bertalannfy were tested. The study of the allometric growth of fish parts was obtained using the model of the exponential equation yi = axbεi. Among the tested, Logistic was the one that exhibited the highest values for AIC and higher for R2 in all variables and genetic groups studied. Observe the difference in coefficient values between benefits for all body weight components, except for head weight. The logistic model was considered more adequate for comparison of the growth parameters. For all genetic groups, the adult stage of animals presents a focus on the body.