Caracterização da piscicultura na região do Vale do Ribeira - SP

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Caracterização da piscicultura na microrregião da baixada cuiabana, Mato Grosso, Brasil

The objective of this study was to characterize the fish farms located in the lowland micro region in Cuiaba, MT, through interviews with 26 selected farmers which represent the universe of fish farms that are active. Qualitative data were subjected to statistical Chi-square test to diagnose the existence of correlation between them with 95% confidence. These results support the conclusion that the species that compose the group of round fish are present in 100% of fish farms, accounting 88.2% of production. The difference is that production exclusively in nurseries and the largest area of shallow water, with production in higher scale than elsewhere in the country, with prospects of growth in area and productivity. Some actions should be implemented: legislation objectively and with sufficient qualified personnel to inspect the enterprises, applied research in food management and feed production with better price and quality, technical and administrative management, use of juveniles with proven genetics and monitoring of water quality. Fish farming is the main source of income funding for 67.5% of farmers interviewed. The size of the fish farms did not affect the variables related to implementation, conduct and management of the activity. The demand and price of feed are the variables that most directs the decision making of farmers. The main marketing channel used by medium and large farmers is exclusively, the slaughterhouses. The main part of fish is sold processed.

Piscicultura e manejo da qualidade da água

Fish farms' water quality management is analyzed with regard to the management employed and the different trophic states are compared within the system during the dry and rainy seasons. Six sites were marked two in the water supply (P1 and P2), and four within the fish farm (P3 to P6). Whereas sites P1 and P2 (water supply) were characterized as oligotrophic, the others were mesotrophic and eutrotrophic sites. Environmental variables, mainly nutrients, conductivity, COD, BOD5 and TSS tended to increase as from P3 due to management and fertilization. Greater impact has been registered in the fish farm under analysis for variables COD, ammonia, total phosphorus and TSS during the discharge and pond emptying period. Frequent monitoring of water quality should be undertaken in fish breeding and plankton production ponds, especially in those close to P3 and P4. Removal of sediment in decantation lake or P5 is also recommended to decrease nutrient concentrations, especially phosphorus, accumulated on the bottom soil.

Influência de uma piscicultura em tanquesrede na dieta e atributos biológicos de Galeocharax knerii na represa de Chavantes, Brasil

The aim of the present study was to evaluate the diet and biological attributes of the population of Galeocharax knerii residing near net cage fish farming activities in the Chavantes reservoir (Paranapanema River, Brazil) to check their possible impacts. Samples were collected from two populations: one near the net cages (NC) and one from an area not influenced by these cages denominated the reference site (RS). Monthly sampling was carried out from March 2008 to February 2009. Fish were caught with a standardized effort using gill nets deployed for 14 hours. The alimentary index (AI) and degree of repletion (RD) were calculated to determine diet composition. Analyses of the sex ratio and the gonadosomatic index (GSI) were also performed. The calculations of AI revealed that fish wastes constituted the most frequent food item in the diet in both study areas (NC = 70.43; RS = 87.55), followed by the consumption of Apareiodon affinis (AI = 29.56), which was abundant near the NC, and prawn at the reference site (AI = 12.28). The sex ratio differed from 1:1 and mature individuals were only found in the population near the NC. The findings demonstrate that G. knerii indirectly benefits from the input of organic matter, using small fish as its main food resource. We conclude that the activities of fish farming influence diet and biological attributes of the species G. knerii, evidenced mainly by higher feeding activity, numerical abundance and biomass in the area of the cages.

Monitoramento de características físico-químicas da água e taxas de sedimentação de tripton no Córrego da Arribada (Baixo Tietê-SP) relacionadas à piscicultura em tanques-rede

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Avaliação limnológica em um sistema de piscicultura na região de Paranaíta (MT, Brasil)

Pós-graduação em Aquicultura - FCAV

Tratamento de efluentes de piscicultura utilizando sistema tipo wetland povoado com espécies de macrófitas aquáticas de três tipos ecológicos diferentes

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Caracterização citogenética e molecular das espécies pintado (Pseudoplatystoma corruscans), cachara (Pseudoplatystoma reticulatum) e seus híbridos utilizados na piscicultura brasileira

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Diversidade bacteriana em piscicultura neotropical

Pós-graduação em Microbiologia Agropecuária - FCAV

Inter-relação entre a comunidade fitoplanctônica e variáveis ambientais em tanques de piscicultura nos períodos de seca e chuva

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Qualidade da água e identificação da comunidade fitoplanctônica de um viveiro de piscicultura utilizado para irrigação

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Influência de uma piscicultura em tanques rede na qualidade da água do Rio São José dos Dourados no município de Ilha Solteira/SP

Pós-graduação em Engenharia Civil - FEIS

Avaliação da qualidade da água em piscicultura com sistema de cultivo em tanques-rede no município de Santa Fé do Sul - SP

Pós-graduação em Engenharia Civil - FEIS

A ictiofauna agregada a um sistema de piscicultura em tanques-rede na represa oligotrófica de Chavantes (médio rio Paranapanema, SP/PR): composição de espécies e atributos ecológicos

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Caracterização citogenética das espécies matrinxã (Brycon amazonicus), piraputanga (Brycon hilarii) e sua geração filial, utilizados na piscicultura brasileira

Pós-graduação em Ciências Biológicas (Zoologia) - IBB