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Efeito da densidade populacional sobre as curvas de crescimento de Macrobrachium rosenbergii (De Man) em cultivo semi-intensivo (Crustacea, Palaemonidae) The effect of stocking density on Macrobrachium rosenbergii (De Man) growth curves in earthen ponds (Crustacea, Palaemonidae)

By Wagner Cotroni Valenti, Jeanette de Toledo Cardoso de Mello and Newton Castagnolli

Abstract

<abstract language="eng">In this article the length growth curves of Macrobrachium rosenbergii (De Man, 1879) held in different population densities were analysed. Postlarvae prawns were stocked into five 0,02 ha earthen ponds at densities of 4, 8, 12, 16 and 20 ind./m² during six months. Forthnightly, the mean total length of animals from each pond were obtained by means of random samples. For each population the length growth curves and the instantaneous growth rate expressions were determined. The growth rate and the asymptotic maximum length decreased with the stocking density raised. This effect is greater when the density ranges in low levels. The growth decrease can be due to intraspecific competition for life resources and to negative interactions between individuals, as aggressive or social behavior, that increase with the increase prawns density

Topics: Crustacea, Palaemonidae, Macrobrachium rosenbergii, ecology, Zoology, QL1-991, Science, Q, DOAJ:Zoology, DOAJ:Biology, DOAJ:Biology and Life Sciences
Publisher: Sociedade Brasileira de Zoologia
Year: 1993
DOI identifier: 10.1590/S0101-81751993000300009
OAI identifier: oai:doaj.org/article:363caf7f81524249b93ff647957bed5c
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