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Larviculture of matrinxã Brycon amazonicus in different feeding and farming systems.

Grant number: 10/16987-0
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): September 01, 2011
Effective date (End): August 31, 2013
Field of knowledge:Agronomical Sciences - Fishery Resources and Fishery Engineering
Principal researcher:Maria da Graça Gama Melão
Grantee:Gustavo Alberto Arbeláez Rojas
Home Institution: Centro de Ciências Biológicas e da Saúde (CCBS). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
Associated research grant:08/02078-9 - Ecophysiological and production studies of the freshwater Anostraca Dendrocephalus brasiliensis Pesta 1921 and its implications on zooplanktonic and nektonic communities, AP.TEM

Abstract

Matrinxã, Brycon amazonicus, is a native species of great commercial importance for fish farming due to its high growth rate, optimal performance under farming conditions, high quality and taste of fillet and tolerance to high stocking densities. However, the bottleneck of matrinxã production is still the low supply of fingerlings due to reproductive traits of the species, which presents a spawning once a year. Remarkable cannibalism is observed during the first 48 hours of life as well as difficulties in the initial feeding which goes over the first week of life. This process considerably reduces the survival of post-larvae in this period and thus increases the marketing prices, often making impossible the production of matrinxã in large-scale. From this perspective, it was aimed to generate basic information on the development of new alternatives for farming matrinxã post-larvae and providing solutions on decreasing of aggressive behavior plus increased the survival rates. This will enable to increase the production of juveniles of matrinxã. The study will be conducted in the laboratory of Plankton and Aquaculture Station, Department of Hydrobiology, Federal University of São Carlos - SP. The experimental tests will follow a randomized experimental design. The larviculture of matrinxã in different farming systems will be evaluated assaying various types of live food. For such, seven treatments will be done: a semi-intensive green-water system (mesocosm - T1); a clear water system, in which the post-larvae will be fed with fresh-hatched nauplii of Artemia (T2); a nauplii branconeta feeding system (T3); a mix composed of nauplii of Artemia and branconeta at a ratio of 1:1 (T4); a moderate swimming exercise system in which post-larvae of matrinxã will be submitted to a flow of clear water and fed with live food composed of nauplii of Artemia (T5) or nauplii branconeta (T6) or a mix composed of nauplii of Artemia and branconeta at a ratio 1: 1 (T7). Each treatment will have four replicates resulting in 28 experimental units. The results from this study will serve as a ground of future hatch studies on this species or other ones of economic interest and / or conservation.

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