Productive performance and economic viability the juvenile of the Nile tilapia cultivated in the west of Paraná submitted to different stocking densities

Authors

  • Nilton Garcia Marengoni Universidade Estadual do Oeste do Paraná
  • Guilherme Wolff Bueno Unioeste-PR
  • Affonso Celso Gonçalves Júnior Unioeste-PR
  • Ana Alix Mendes de Almeida Oliveira Unioeste-PR

Abstract

It was aimed at with this work to evaluate the effect of the stocking density on the performance parameters, survival and economic viability of the production of juvenile of Nile tilapia (Oreochromis niloticus), Chitralada strain in half-intensive system, using twelve tank nurseries. 2700 juvenile sexually reverted with initial average weight of 0.65 g were distributed in an entirely randomized experimental design with four treatments (different stocking densities: 1, 2, 3, 4 peixes/m3) and three repetitions. During the tracking of the physical-chemical variables of the water, the pH (6.6 to 7.1) and the conductivity (24 μS/cm) had presented satisfactory average values. However, the transparency (47 to 87 cm), the dissolved oxygen (3.09 to 4.60 mg/L) and the temperature (19 to 24ºC) had been outside of the normal standards recommended for the tropical fish culture. At the of the 84 days of culture the average daily mean weight (0.61 to 1.02 g/day) and the specific growth (5.22 to 5.82%) of the juveniles had presented a negative linear relationship (p<0.05) and the alimentary conversion (0.98 to 1.84) a quadratic relationship (p<0.01) in function to the stocking density. It was concluded that, in the conditions where these studies had been carried through, the stocking densities had influenced in the productive performance the juvenile of Nile tilapia, providing an increase in the ration consumption and consequently in the production cost. Through an economical analysis of the production the best economical viability is verified when used a density of up to 3 fish/m3.

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Author Biography

Nilton Garcia Marengoni, Universidade Estadual do Oeste do Paraná

Nilton Garcia Marengoni possui graduação em Zootecnia pela Universidade Estadual de Maringá (1990), mestrado em Fisheries Science (Ciência da Piscicultura) pela Fisheries Faculty da Universidade de Kagoshima (1995), doutorado em Fisheries Science (Ciência da Piscicultura) pela Universidade de Kagoshima (1998) e pós-doutoramento pela Universidade Federal do Ceará (UFC). Atualmente é professor adjunto B do Centro de Ciências Agrárias, Campus de Marechal Cândido Rondon da Universidade Estadual do Oeste do Paraná (Unioeste) atuando na gradução e pós-graduação (stricto sensu) em zootecnia. Na Unioeste, atua efetivamente, como docente orientador do Programa de Pós-graduação em Zootecnia (Mestrado), Programa de Iniciação científica e Trabalhos de Conclusão de Curso na área de Recursos Pesqueiros e Engenharia de Pesca/Zootecnia. Tem ampla experiência na área de Aqüicultura com ênfase em cadeias produtivas e sustentabilidade, tilapicultura, tilápia do Nilo (Oreochromis niloticus) e tanques-rede. É membro da Comissão Estadual do Ensino da Zootecnai (CEEZ-CRMV-PR) e do Banco de Dados de Avalidores Institucionais/Cursos do SINAES/INEP.

Published

2008-06-25

Issue

Section

Fisheries / Aquaculture