Desempenho zootécnico da tilápia tailandesa, linhagem Chitralada, em tanques-rede no Reservatório de Nova Avanhandava, B uritama, SP: modelo empírico de classificação e repicagem

• Autor(a) principal: Camargo, André Luiz Scarano [UNESP]
• Data de Publicação: 2007
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/108910
• topic: Tilapia (Peixe); Desempenho; Classificação - repicagem

The tilapia culture in cages is growing quickly all over the world. This can be accounted for its excellent acceptability as part of people's diet, for the availability of hydric resources existent, and for the technical efficiency of the production systems_. Nowadays, Brazil is considered as the biggest potential country for the development of this modality of production, once its hydroelectric matrix makes the rational use of the reservoirs for aquaculture purposes possible. The objective of this work was to evaluate the technical performance of the tilapia commercial production in cages at the Reservatório da Usina Hidrelétrica de Nova Avanhandava, Buritama-SP, using a model of empirical c1assification as the culture base. Biometric measures (total length and total weight) were taken monthly from 80 individual fishes per cage for 150 days. In order to evaluate de technical performance, we stated the following variables: average weight, stocking density, biomass density, daily earn of weight, total earn of weight, and alimentary conversion tax. Still, we estimated the curve of weight-Iength relation, the growth factor, some economics variables, as well as a brief evaluation of the environmental variables. The tilapias presented total weight earns varying from 209,79 to 495,47 g, in agreement to the class in which they were sorted. The daily weight earns varied from 1,55 to 3,93 9 and the alimentary conversion taxes varied from 1,42 to 1,63. The weight-Iength relation curve behaved equally for all classes and there was no variation after the c1assification process. The condition factor, by its turn, presented gain after c1assification, for all examples. The production costs of the studied system varied from R$ 2,44 to R$ 2,71. The environmental variables did not presented any difference between the two studied areas, although they pointed necessity of constant accompaniment. We can so conclude that it is possible ...