Qualidade da água em viveiros de criação de peixes com sistema de fluxo contínuo

• Ano de defesa: 2004
• Autor(a) principal: Macedo, Carla Fernandes [UNESP]
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Aquicultura; Peixe - Criação; Viveiros; Limnologia; Água - Qualidade; Fishes
• Link de acesso: http://hdl.handle.net/11449/144166; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/08-09-2016/000220687.pdf

This study was carried out at six semi-intensive breeding fishponds at the UNESP (CAUNESP) Aquaculture Center, in Jaboticabal, SP. The fishponds were set up sequentially, with the water from one fishpond flowing directly into the neat one, with no previous treatment, receiving water from other tanks and smaller ponds from the pisciculture, frogbreeding, and crustacean-breeding sectors. The purpose of this work was to determine, physical and chemical variables (pH, dissolved oxygen, conductivity, temperature, total alkalinity, and inorganic carbon forms), nutrients (nitrogen and phosphorous), heavy metals (lead, cadmium, copper, zinc, manganese, nickel, and chromium), solids in suspension, DBO5, DQO, sanitary relevant microorganisms (coliforms and heterotrophic bacteria), and planktonic community consist, in order greater information on the cultivation system dynamics and impact minimizing alternatives. Collections were made at the inlet of each pond for fifteen days, at two different times of the year, the dry and the wet periods. The results demonstrated that the sequential layout of the fishponds studied had favored a change in the limnological features along the system; the differences found between the periods were related to the variables directly connected to climate factors; the microbiological parameters have displayed a great inflow of fecal coliforms, total coliforms and heterotrophic bacteria in the last fishpond, from which the water flows to a natural stream. Environmental management practices are recommended, with the construction of biofilters on the effluent of these fishponds as well as appropriate food management not accumulating an excess of food not assimilated by the fish, in the water column