DIEL AND VERTICAL DYNAMIC OF LIMNOLOGICAL CHARACTERISTICS IN FISH REARING NET-CAGES ENVIROMENT
DOI:
https://doi.org/10.5216/cab.v11i1.6754Keywords:
Aquaculture. Intensive cultivation. Limnology. Water QualityAbstract
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.
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