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Carrying capacity and potential environmental impact of fish farming in the cascade reservoirs of the Paranapanema River, Brazil

2016; Wiley; Volume: 48; Issue: 7 Linguagem: Inglês

10.1111/are.13169

1365-2109

Roberto Montanhini Neto, Helder Rafael Nocko, Antônio Ostrensky,

Fish Ecology and Management Studies

Aquaculture ResearchVolume 48, Issue 7 p. 3433-3449 Original Article Carrying capacity and potential environmental impact of fish farming in the cascade reservoirs of the Paranapanema River, Brazil Roberto Montanhini Neto, Corresponding Author Roberto Montanhini Neto roberto.neto@ufpr.br Integrated Group of Aquaculture and Environmental Studies, Federal University of Paraná, Curitiba, Paraná, BrazilCorrespondence: R Montanhini Neto, Integrated Group of Aquaculture and Environmental Studies, Federal University of Paraná, Rua dos Funcionários 1540, 80035-050, Curitiba, Paraná, Brazil. E-mail: roberto.neto@ufpr.brSearch for more papers by this authorHelder Rafael Nocko, Helder Rafael Nocko Integrated Group of Aquaculture and Environmental Studies, Federal University of Paraná, Curitiba, Paraná, BrazilSearch for more papers by this authorAntonio Ostrensky, Antonio Ostrensky Integrated Group of Aquaculture and Environmental Studies, Federal University of Paraná, Curitiba, Paraná, BrazilSearch for more papers by this author Roberto Montanhini Neto, Corresponding Author Roberto Montanhini Neto roberto.neto@ufpr.br Integrated Group of Aquaculture and Environmental Studies, Federal University of Paraná, Curitiba, Paraná, BrazilCorrespondence: R Montanhini Neto, Integrated Group of Aquaculture and Environmental Studies, Federal University of Paraná, Rua dos Funcionários 1540, 80035-050, Curitiba, Paraná, Brazil. E-mail: roberto.neto@ufpr.brSearch for more papers by this authorHelder Rafael Nocko, Helder Rafael Nocko Integrated Group of Aquaculture and Environmental Studies, Federal University of Paraná, Curitiba, Paraná, BrazilSearch for more papers by this authorAntonio Ostrensky, Antonio Ostrensky Integrated Group of Aquaculture and Environmental Studies, Federal University of Paraná, Curitiba, Paraná, BrazilSearch for more papers by this author First published: 26 July 2016 https://doi.org/10.1111/are.13169Citations: 5Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract The objective of this study was to simulate changes in water quality standards caused by the installation of aquaculture parks for caged fish farming in the eight large artificial reservoirs in the Paranapanema River according to the different scenarios of technical and legal limitations: (i) occupancy of 1% of the total surface of the reservoirs and (ii) occupancy according to the environmental carrying capacity. For water quality modelling, these two scenarios were simulated to determine the trophic state index (TSI) of each reservoir. Based on the total area of all reservoirs in the first scenario, the fish farm facilities would occupy 18.3 km2 and have an annual fish production of an estimated 513 thousand MT. However, because of limitations in the carrying capacity, the annual production in the second scenario would be 98 thousand MT and the fish farm facilities would occupy 3.5 km2. Simulating the TSI for the first scenario, approximately 75% of the total area of all reservoirs was estimated to change from oligo or mesotrophic conditions to eutrophic, supereutrophic and hypereutrophic conditions, and four reservoirs may become completely eutrophic (Canoas 2, Canoas 1, Taquaruçu and Rosana). For the second scenario, however, eutrophic areas accounted for less than 30% of the total, although the Taquaruçu and Rosana reservoirs were still at risk of total eutrophication. These results indicate as well-intentioned legislation can have unintended environmental consequences in dynamic social–ecological aquaculture systems as in the case of large reservoirs in the Paranapanema River. Citing Literature Volume48, Issue7July 2017Pages 3433-3449 RelatedInformation