Morphometric and Allometric Growth of Piracanjuba (Brycon orbignyanus) as related with body weight corporal / Curvas de crescimento morfomÃtrico e alomÃtrico de Piracanjuba (Brycon orbignyanus)

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

An experiment was carried in the fish farming sector of the Universidade Federal de Lavras, with the objective of establishing morphometric and allometric growth curves as related with body weight for the piracanjuba (Brycon orbignyanus), by utilizing different growth models for morphometric evaluation and Huxley model for the allometric one. Fingerlings of piracanjuba were cultivated in earthen ponds and fed commercial diet (ad libitum) till they reach weight of about 1 kg. Over the experimental period, eight random samplings were performed, where the morphometric measures head length (CCAB), standard length (CP), height (AND) and breadth (LND) taken on the 1st Ray of the dorsal fin and the morphometric ratios (CCAB/CP, AND/CP, LND/CP, AND/LND) were evaluated by making use of the functions of Brody, von Bertalanffy, Gompertz and Logistic. All the functions showed a good fit for all the morphometric measures studied and only for the CCAB/CP ratio. The functions of Brody, von Bertalanffy and Gompertz presented similar fit qualities when studying the morphometric measures, the logistic function having provided poor fit. With relation to the CCAB/CP ratio, the logistic function presented a fit quality superior to the other functions. The growth rate of the variables CCAB and LND was higher than those of the CP and AND, pointing a faster growth of the head and breadth than that of the standard length and height. Also it may be observed that the greatest absolute growth rates of the metric measures studied took place in early lifetime, in weight range previous to 100 grams. The measure with which the piracanjuba reaches its comercial body weight, values of 6.78, 33.49, 4.39, 10.82 cm for CCAB, CP, LND and AND, respectively are expected. It was found that the development of the fillet is isogonic. It follows that all the models studied presented a good fit, those of Brody e von Bertalanffy were the ones that best report the morphometric growth of fishes. The development of the fillet of piracanjuba occurs at the same rate as the body development.

ASSUNTO(S)

piscicultura piracanjuba zootecnia crescimento growth piracanjuba

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