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| Araujo,Mariana Cutolo de; Valenti,Wagner Cotroni. |
| ABSTRACT Effects of four feeding regimes on the development and feed intake, survival, productivity, and growth of Macrobrachium amazonicum larvae were investigated. Larvae were fed from stage II to IX, as follows: Artemia nauplii + inert diet during the entire larval cycle (AIn); Artemia nauplii for the entire larval cycle + inert diet from stage V onward (A/AIn); Artemia nauplii until stage IV + inert diet from stage IV onward (A/In); and only inert diet for the entire larval cycle (In). Each feeding regime (treatment) was carried out in three 50-L rectangular black tanks, set up in a recirculating system, filled with 10 salinity brackish water, and stocked at 81.8±0.8 larvae/L. The larval stage index, occurrence of Artemia nauplii and/or inert feed into... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Prawn larvae; Productivity; Replacing of Artemia; Stages; Survival. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000200085 |
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| Valenti,Wagner Cotroni; Mello,Jeanette de Toledo Cardoso de; Castagnolli,Newton. |
| 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... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Crustacea; Palaemonidae; Macrobrachium rosenbergii; Ecology. |
| Ano: 1993 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751993000300009 |
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| Valenti,Wagner Cotroni; Mello,Jeanette de T. Cardoso de; Lobão,Vera Lúcia. |
| In this paper, the fecundity in Macrobrachium acanthurus (Wiegmann, 1836) of the Ribeira de Iguape river (Southern Brazil) (Crustacea, Decapoda, Palaemonidae), is presented. The mean individual fecundity of the population was estimated. Fecundity was related to either length and/or weight. Our data showed that this species presents high fecundity and is thus suitable for comercial culture. The fecundity/length and fecundity/weight relationships obtained are: F = - 14 712 + 2 311,8 L and F = -1493,9 + 798,76 W |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1989 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751989000100002 |
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