Evaluating 36 years of fishing sustainability in a large reservoir
Abstract Various fishing activities are common economic practices in large hydroelectric reservoirs, such as Itaipu. Consequently, the Itaipu company has monitored artisanal commercial fishing since the formation of its reservoir. In this study, we used long-term monitoring data to evaluate the sust...
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Nature Portfolio
2025-01-01
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| Online Access: | https://doi.org/10.1038/s41598-025-88209-8 |
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| author | Luiz Guilherme dos Santos Ribas Pitágoras Augusto Piana Caroline Henn Anderson Luís Maciel Geuza Cantanhêde Maurício Spagnolo Adames Éder André Gubiani |
| author_facet | Luiz Guilherme dos Santos Ribas Pitágoras Augusto Piana Caroline Henn Anderson Luís Maciel Geuza Cantanhêde Maurício Spagnolo Adames Éder André Gubiani |
| author_sort | Luiz Guilherme dos Santos Ribas |
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| description | Abstract Various fishing activities are common economic practices in large hydroelectric reservoirs, such as Itaipu. Consequently, the Itaipu company has monitored artisanal commercial fishing since the formation of its reservoir. In this study, we used long-term monitoring data to evaluate the sustainability of this fishing activity in the Itaipu Reservoir, one of the largest reservoirs in the Neotropical region. Sustainability was evaluated by analyzing raw data patterns, evaluating species abundance distributions, building surplus production models, and forecasting biomass under different fishing scenarios. This evaluation spanned 36 years (1987–2022) and provided insights into 25 fish stocks. Additionally, we examined changes in stocks before and after 2000, coinciding with the construction of a fish pass and Porto Primavera Dam, a large upstream hydroelectric power plant. Our results show that, even after 40 years since the formation of the reservoir, biomass yields continue to decline, with fishing not being the primary cause, and certain stocks only being recorded after 2000. In 2022, we identified 12 fish stocks as sustainable, nine as recovering biomass, and four as overfished. We consider fishing in the Itaipu Reservoir to be currently sustainable, though concerns persist regarding the four overfished stocks and the decreasing biomass, which could pose future challenges for fishing activities in the reservoir. Additionally, the data suggests that even 40 years after the reservoir was formed, fish populations may not yet be stable in large reservoirs. |
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| institution | Kabale University |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-01-01 |
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| series | Scientific Reports |
| spelling | doaj-art-b431d1da3c6e405496440412ba78c52a2025-02-02T12:16:57ZengNature PortfolioScientific Reports2045-23222025-01-0115111410.1038/s41598-025-88209-8Evaluating 36 years of fishing sustainability in a large reservoirLuiz Guilherme dos Santos Ribas0Pitágoras Augusto Piana1Caroline Henn2Anderson Luís Maciel3Geuza Cantanhêde4Maurício Spagnolo Adames5Éder André Gubiani6Laboratory of Ichthyology and Fisheries Statistics, Grupo de Pesquisas em Recursos Pesqueiros e Limnologia (GERPEL), Western Paraná State University (UNIOESTE)Laboratory of Ichthyology and Fisheries Statistics, Grupo de Pesquisas em Recursos Pesqueiros e Limnologia (GERPEL), Western Paraná State University (UNIOESTE)Itaipu Binacional, Foz do IguaçuLaboratory of Ichthyology and Fisheries Statistics, Grupo de Pesquisas em Recursos Pesqueiros e Limnologia (GERPEL), Western Paraná State University (UNIOESTE)Laboratory of Ichthyology and Fisheries Statistics, Grupo de Pesquisas em Recursos Pesqueiros e Limnologia (GERPEL), Western Paraná State University (UNIOESTE)Itaipu Binacional, Foz do IguaçuLaboratory of Ichthyology and Fisheries Statistics, Grupo de Pesquisas em Recursos Pesqueiros e Limnologia (GERPEL), Western Paraná State University (UNIOESTE)Abstract Various fishing activities are common economic practices in large hydroelectric reservoirs, such as Itaipu. Consequently, the Itaipu company has monitored artisanal commercial fishing since the formation of its reservoir. In this study, we used long-term monitoring data to evaluate the sustainability of this fishing activity in the Itaipu Reservoir, one of the largest reservoirs in the Neotropical region. Sustainability was evaluated by analyzing raw data patterns, evaluating species abundance distributions, building surplus production models, and forecasting biomass under different fishing scenarios. This evaluation spanned 36 years (1987–2022) and provided insights into 25 fish stocks. Additionally, we examined changes in stocks before and after 2000, coinciding with the construction of a fish pass and Porto Primavera Dam, a large upstream hydroelectric power plant. Our results show that, even after 40 years since the formation of the reservoir, biomass yields continue to decline, with fishing not being the primary cause, and certain stocks only being recorded after 2000. In 2022, we identified 12 fish stocks as sustainable, nine as recovering biomass, and four as overfished. We consider fishing in the Itaipu Reservoir to be currently sustainable, though concerns persist regarding the four overfished stocks and the decreasing biomass, which could pose future challenges for fishing activities in the reservoir. Additionally, the data suggests that even 40 years after the reservoir was formed, fish populations may not yet be stable in large reservoirs.https://doi.org/10.1038/s41598-025-88209-8Inland fisheriesFisheries managementLong-term monitoringAnthropic activitiesConservationSustainable fisheries |
| spellingShingle | Luiz Guilherme dos Santos Ribas Pitágoras Augusto Piana Caroline Henn Anderson Luís Maciel Geuza Cantanhêde Maurício Spagnolo Adames Éder André Gubiani Evaluating 36 years of fishing sustainability in a large reservoir Scientific Reports Inland fisheries Fisheries management Long-term monitoring Anthropic activities Conservation Sustainable fisheries |
| title | Evaluating 36 years of fishing sustainability in a large reservoir |
| title_full | Evaluating 36 years of fishing sustainability in a large reservoir |
| title_fullStr | Evaluating 36 years of fishing sustainability in a large reservoir |
| title_full_unstemmed | Evaluating 36 years of fishing sustainability in a large reservoir |
| title_short | Evaluating 36 years of fishing sustainability in a large reservoir |
| title_sort | evaluating 36 years of fishing sustainability in a large reservoir |
| topic | Inland fisheries Fisheries management Long-term monitoring Anthropic activities Conservation Sustainable fisheries |
| url | https://doi.org/10.1038/s41598-025-88209-8 |
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