Efluentes da piscicultura intensiva em viveiros escavados: caracterização e dinâmica dos nutrientes
| Ano de defesa: | 2018 |
|---|---|
| Autor(a) principal: |
Coldebella, Anderson
 |
| Orientador(a): |
Feiden, Aldi
|
| Banca de defesa: |
Feiden, Aldi
,
Signor, Altevir
,
Piana, Pitágoras Augusto
,
Freitas, Jakeline Marcela Azambuja de
,
Leonhardt, Julio Hermann
|
| Tipo de documento: | Tese |
| Tipo de acesso: | Acesso aberto |
| Idioma: | por |
| Instituição de defesa: |
Universidade Estadual do Oeste do Paraná
Toledo |
| Programa de Pós-Graduação: |
Programa de Pós-Graduação em Recursos Pesqueiros e Engenharia de Pesca
|
| Departamento: |
Centro de Engenharias e Ciências Exatas
|
| País: |
Brasil
|
| Palavras-chave em Português: | |
| Palavras-chave em Inglês: | |
| Área do conhecimento CNPq: | |
| Link de acesso: | http://tede.unioeste.br/handle/tede/4685 |
Resumo: | The activity of fish farming in the west of Paraná is national highlight for pioneering, cutting-edge technology and productivity. The activity growth is related to the investments of the private initiative and of the cooperatives of the region that implemented the integration system for fish farming. The intensification and increase of the areas destined to fish farming can cause damages to the environment when conducted in an incorrect way, in which the main environmental impact caused by the activity is the contribution of nutrients and organic matter released in the springs through the culture effluents, having as eutrophication of these environments. Fish farming in the region is carried out in ponds intensively ways, with constant water renewal during cultivation, however, at the time of the harvest a larger effluent quantity is discharged to the environment in a short time. In this work, the effluents from the intensive Nile tilapia (Oreochromis niloticus) cultivation were evaluated in different ponds sizes and at different moments of fish harvesting, in order to characterize this effluents and to verify the nutrient load released to the environment. In addition, the recovery dynamics of nitrogen (N) and phosphorus (P) were also evaluated in the culture environment, through the nutrients input and output balance in the system. The effluents characterization was submitted to principal components analysis - PCA, to evaluate the correlation between the parameters measured in relation to the different sizes of nurseries and moments of fish harvesting. The results indicated that Suspended Solids (SS), Total Solids (TS), Chemical Oxygen Demand (COD) and Total Phosphorus (TP) increased significantly during the fish harvesting process, and are directly correlated to the other parameters, worsening the effluents quality released to the environment. The nutrient dynamics in the evaluated productive system showed that the fish reverts in biomass, 33.2% of N and 35.3% of P of the dry matter inserted in the fish food and are eliminated 2,37 % of N and 2,05 % of P in the effluents of the total inserted during cultivation. The rest of the nutrients may have been lost or transformed during cultivation or accumulated in the sediment. Although the region's fsh farming is considered as a productivity model and is consolidated as a successful and profitable activity for producers, the activity must be concerned with maintaining the quality of water during the fishes cultive, seeking alternatives to reduce water use, improviment to reuse practices and to adequate the effluents discharge to environmental requirements. |