Abstract The Amazon Basin stands out mainly for its large floodplain’s areas, which during the period of high water become important environments for the maintenance of the life cycle of many fish species. These floodplains act as a source of food and an area for growth and reproduction for the fish assemblages. However, there are few studies on the use of floodplain lakes for breeding fish in confinement. Therefore, we analyzed the support capacity and environmental parameters of Lake Cujubim, in the Madeira River Basin, regarding its use for the implementation of intensive fish farming (net tank system). From 2019 to 2020, bathymetric profiles and limnological data were collected, considering the seasonality of the water level and the shape of the Lake Cujubim. The bathymetry data were primarily used to verify the parameters of depth, area and volume of the lake, while limnological data contributed to statistical analyses for the evaluation of health status and support capacity of the lake for fish farming in an intensive production system. The data collected from the limnological analyses and the depth and profile indicate that Lake Cujubim is suitable for the cultivation of fish, and has an estimated support capacity for an annual production of up to 468.31 tonnes of fish. Herein, we propose a viable alternative for the social and productive development of intensive fish farming in an area of floodplain lake in the state of Rondônia, Brazil. s areas species assemblages However confinement Therefore net system . system) 201 2020 46831 468 31 468.3 Herein Rondônia Brazil 20 202 4683 46 3 468. 2 4

Resumo A bacia Amazônica se destaca principalmente por suas extensas áreas alagadas, que durante o período de cheia se tornam importantes ambientes para a manutenção do ciclo de vida de muitas espécies de peixes. Esta planície de inundação atua como fonte de alimento e área para o crescimento e reprodução para as assembleias de peixes. No entanto, existem poucos estudos sobre o uso dos lagos de várzeas para a criação de peixes em cativeiro. Todavia, aqui analisamos a capacidade de suporte e os parâmetros ambientais do lago Cujubim, na bacia do rio Madeira, visando o seu uso para a implementação da criação intensiva de peixes (sistemas de tanques rede). No período de 2019 a 2020 foram realizados perfis batimétricos e coleta de dados limnológicos, considerando a sazonalidade do nível da água e a forma do lago Cujubim. Os dados da batimetria foram primordiais para verificar os parâmetros de profundidade, área e volume do lago, enquanto que os dados limnológicos contribuíram com as análises estatísticas para a avaliação do estado de sanidade e capacidade de suporte para criação de peixes em sistema intensivo de produção. Os dados coletados, das análises limnológicas e do perfil de profundidade, indicaram que o lago Cujubim é apropriado para a criação de peixes, e tem uma capacidade de suporte estimada de 468,31 toneladas de peixes por ano. Dessa forma, propomos aqui uma alternativa social e viável para o desenvolvimento da piscicultura intensiva em área de lago de várzea no estado de Rondônia, Brasil. alagadas entanto cativeiro Todavia Madeira sistemas rede. rede . rede) 201 202 profundidade produção coletados 46831 468 31 468,3 ano Rondônia Brasil 20 4683 46 3 468, 2 4

Abstract The demand for wild tambaqui has led to overfishing of their natural stocks, and has thus increased the demand for farmed fish. This has raised a question regarding the nutritional value of these groups of individuals; to see if they differ when they grow in wild and farmed environments. The meat of 28 tambaqui was evaluated by measuring the moisture, ash and total proteins among the fish from the two different environments in the states of Amazonas and Rondônia, Brazil. The averages of the centesimal composition showed significant differences, between environments and states. The moisture values of wild fish between the states did not differ, but were higher than those farmed in either of the states. The ash value also showed differences between groups by environment and between states. However, it was found that wild tambaqui from both states exhibited the best levels of protein and did not show statistical dissimilarities. The group farmed in Rondônia was also similar to the wild ones caught in that state. As for farmed fish, the averages between states were different, with the lowest value attributed to fish from Amazonas. The data show that wild tambaqui had a higher nutritional value than farmed fish.