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Journal Article

Potencial pesqueiro de Macrobrachium amazonicum na Amazônia Cenzral (Ilha do Careiro): variação da abundância e do comprimento

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Citation

Odinetz Collart, O., & Moreira, L. C. (1993). Potencial pesqueiro de Macrobrachium amazonicum na Amazônia Cenzral (Ilha do Careiro): variação da abundância e do comprimento. Amazoniana: Limnologia et Oecologia Regionalis Systematis Fluminis Amazonas, 12(3/4), 399-413.


Cite as: http://hdl.handle.net/21.11116/0000-0004-893A-1
Abstract
Abundance and body size variations of the prawn Macrobrachium amazonicum (HELLER, 1862) have been studied in a Central Amazonian floodplain lake, on Careiro Island. The highest number of captures and smallest sizes have been observed beneath floating macrophyte meadows. This suggests that these meadows serve a nursery habitats. The densities registered in the Amazon river were three times lower than in the lake. Maximum densities were recorded during low-water periods, while minimum densities were found during high water periods. These results point to a relationship between current force and catchability. In the floodplain lake, prawn abundance seems to be related to macrophyte expansion during the periods of rising water; the lowest captures were registered at high water, which is probably due to the spatial dispersion as the water volume increases. River prawn populations are characterized by larger sizes than the ones in the lake. They show a well-marked pattern of seasonal variation in size, with larger sizes found during periods of rising water and smaller sizes predominating during high-water periods. On the contrary, lagoonal prawns show maximum sizes during high-water, and smallest sizes during low-water periods. Despite its good fishing potential (up to 200 g/trap), the native prawn is not exploited in the Amazonas, but imported from the State of Pará. Artesanal prawn fishing in floodplain lakes, or extensive culture in ponds for carnivorous fish or human consumption, can be a commercially lucrative activity for sustainable regional economic development.