Abstract
This study aimed to verify the diel and vertical dynamic characteristics in limnological environment for rearing native fish in net-cage at the reservoir of Itaipu Binacional. The parameters evaluated were water temperature, dissolved oxygen, electrical conductivity, pH, phosphorus, nitrite and ammonia. It was found that there was diel variation for all parameters, except for ammonia and phosphorus. But the variables are in the recommended limits for aquaculture, with the exception of dissolved oxygen that showed critical rates at night. For the vertical distribution concentrations of physical and chemical parameters of water did not exceed the limit established by CONAMA Resolution 357/05 for fish rearing, however, there was vertical variation for nitrite and phosphorus.KEY WORDS: Aquaculture, intensive culture, limnology, water quality.
Highlights
This study aimed to verify the diel and vertical dynamic characteristics in limnological environment for rearing native fish in net-cage at the reservoir of Itaipu Binacional
the variables are in the recommended limits for aquaculture
exceed the limit established by CONAMA Resolution 357/05 for fish rearing
Summary
Segundo KUBITZA (1999), a escala adequada de pH para a produção de peixes está compreendida entre 6,5 a 9,0, sendo que valores acima ou abaixo podem prejudicar o desenvolvimento dos animais. GRAEFF & PRUNER (2006), estudando as variáveis que podem interferir na criação de tilápias em viveiros, relatam que a estratificação térmica e a contínua aeração formada pela corrente da água com ajuda dos ventos contribuem para que não ocorra a diminuição de oxigênio e colabore para a não ocorrência de amônia em sistemas de cultivo.
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