Abstract
[This study estimates reproductive parameters (length at first maturity, reproduction period, and fecundity), mortality, and maximum sustainable yield for Macrobrachium amazonicum on Combu Island (Amazon estuary). Samples were taken monthly between March 2003 and February 2004. Ovigerous females were recorded throughout the year, with reproductive peaks in the middle of the flood period (March), in the low water period (September), and the peak dry period (December) of the Guama River. The size at which 50% of the females were mature was 60.8 mm TL. Absolute fecundity varied between 40 and 3375 eggs per female. The exploitation rate for maximum sustainable yield (E MSY ) for males was lower than that for females. For both sexes, E MSY was below the exploitation rates (E). The present study demonstrates the need for management of the prawn fishery on the islands in the Amazon estuary, such as establishing a minimum commercial size. Este estudo tem o objetivo de estimar os parâmetros reprodutivos (tamanho de primeira maturidade, periodo reprodutivo e fecundidade), mortalidade e rendimento maximo sustentavel do Macrobrachium amazonicum da Ilha do Combu (Estuario Amazonico). As amostras foram coletadas mensalmente, entre marco de 2003 e fevereiro de 2004. Femeas ovigeras foram registradas ao longo de todo ano, com picos reprodutivos no meio da enchente (marco), vazante (setembro) e pico de minima vazao (dezembro) no Rio Guama. O tamanho na qual 50% das femeas estao maduras e de 60,8 mm de comprimento total. Fecundidade absoluta variou entre 40 e 3375 ovos por femea. A taxa de exploracao para a obtencao do rendimento maximo sustentavel (E RMY ) para machos foi inferior ao obtido para as femeas. Para ambos sexos E RMY foi abaixo das taxas de explotacao atuais (E). O presente estudo demonstra a necessidade do manejo da pesca de camarao nas ilhas do estuario Amazonico, como por exemplo o estabelecimento de tamanho minimo de comercializacao. , This study estimates reproductive parameters (length at first maturity, reproduction period, and fecundity), mortality, and maximum sustainable yield for Macrobrachium amazonicum on Combu Island (Amazon estuary). Samples were taken monthly between March 2003 and February 2004. Ovigerous females were recorded throughout the year, with reproductive peaks in the middle of the flood period (March), in the low water period (September), and the peak dry period (December) of the Guama River. The size at which 50% of the females were mature was 60.8 mm TL. Absolute fecundity varied between 40 and 3375 eggs per female. The exploitation rate for maximum sustainable yield (E MSY ) for males was lower than that for females. For both sexes, E MSY was below the exploitation rates (E). The present study demonstrates the need for management of the prawn fishery on the islands in the Amazon estuary, such as establishing a minimum commercial size. Este estudo tem o objetivo de estimar os parâmetros reprodutivos (tamanho de primeira maturidade, periodo reprodutivo e fecundidade), mortalidade e rendimento maximo sustentavel do Macrobrachium amazonicum da Ilha do Combu (Estuario Amazonico). As amostras foram coletadas mensalmente, entre marco de 2003 e fevereiro de 2004. Femeas ovigeras foram registradas ao longo de todo ano, com picos reprodutivos no meio da enchente (marco), vazante (setembro) e pico de minima vazao (dezembro) no Rio Guama. O tamanho na qual 50% das femeas estao maduras e de 60,8 mm de comprimento total. Fecundidade absoluta variou entre 40 e 3375 ovos por femea. A taxa de exploracao para a obtencao do rendimento maximo sustentavel (E RMY ) para machos foi inferior ao obtido para as femeas. Para ambos sexos E RMY foi abaixo das taxas de explotacao atuais (E). O presente estudo demonstra a necessidade do manejo da pesca de camarao nas ilhas do estuario Amazonico, como por exemplo o estabelecimento de tamanho minimo de comercializacao. ]
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