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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effects of prawn stocking density and feeding management on rice-prawn culture

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Boock, Marcello Villar [1] ; de Almeida Marques, Helcio Luis [1] ; Mallasen, Margarete [2] ; Barros, Helenice Pereira [2] ; Moraes-Valenti, Patricia [3, 4] ; Valenti, Wagner C. [5, 6]
Total Authors: 6
[1] Agencia Paulista Tecnol Agronegocios, Secretaria Agr Estado Sao Paulo, Polo APTA Ctr Leste Paulista, UPD Pirassununga, BR-13641004 Pirassununga, SP - Brazil
[2] Agencia Paulista Tecnol Agronegocios, Secretaria Agr Estado Sao Paulo, Inst Pesca, Ctr APTA Pescado Continental, BR-15025970 Sao Jose Do Rio Preto, SP - Brazil
[3] Univ Santo Amaro, UNISA, BR-14884900 Jaboticabal, SP - Brazil
[4] CAUNESP, BR-14884900 Jaboticabal, SP - Brazil
[5] Sao Paulo State Univ UNESP, Biosci Inst, BR-11330900 Sao Vicente, SP - Brazil
[6] CNPq, CAUNESP, BR-11330900 Sao Vicente, SP - Brazil
Total Affiliations: 6
Document type: Journal article
Source: Aquaculture; v. 451, p. 480-487, JAN 20 2016.
Web of Science Citations: 4

The effects of prawn (Macrobrachium rosenbergii) stocking density and the use of commercial diet on rice-prawn culture were evaluated. The experimental design was completely randomized in a 2 x 2 factorial, with a control (rice monoculture, RM) and four replicates for each treatment. The treatments were: 2 prawns m(-2) without feed (2W), 2 prawns m(-2) with feed (2F), 5 prawns m(-2) without feed (5W) and 5 prawns m(-2) with feed (5F). Mean survival varied from 17.2 +/- 9.3% (5F) to 39.2 +/- 14.9% (2F), and mean weight from 20.3 +/- 2.2 g (2W) to 25.7 +/- 5.85 g (2F). Prawn productivity ranged between 118 +/- 58 kg ha(-1) (2W) and 224 +/- 46 kg ha(-1) (5W). No significant interactions were observed between feeding management and densities. Survival rate was significantly higher (P < 0.05) for the 2 prawn m(-2) density while the other variables did not vary significantly among treatments. Rice yields were not statistically different among treatments and varied from 4608 +/- 1225 kg ha(-1) (2F) and 5620 +/- 1202 kg ha(-1) (RM). The results indicate that the rice-prawn system is technically feasible and does not need the addition of commercial diet. Economic analysis showed that stoking 5 prawns m(-2) was not profitable. Total production costs and gross revenue were US\$ 1337.84 and US\$ 1182.07 for rice monoculture and US\$ 2655.60 and US\$ 2738.70 for the rice-prawn system(2 prawns m(-2); without feed), respectively. Therefore, the integrated rice-prawn system is a suitable alternative to make rice production economically feasible on small farms without government subsidies. Statement of relevance: New finds to the international literature, such as the synergic effect of stocking density and commercial feed supply in simultaneous rice-prawn system assessed by a technical and economic perspective; discussion about carrying capacity of paddy fields, in simultaneous system; natural feed is not a major limiting factor for stocking densities up to 5 prawns m(-2) as presumed in other studies. (C) 2015 Elsevier B.V. All rights reserved. (AU)