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      Update on the ichthyofauna of the Piquiri River basin, Paraná, Brazil: a conservation priority area Translated title: Atualização da ictiofauna da bacia do rio Piquiri, Paraná, Brasil: uma área prioritária para conservação

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          Abstract

          Abstract: Knowledge of the fish species in river basins is among the minimum requirements for the management of water and fish resources. Therefore, the aim of this study was to update the fish species composition of the Piquiri River basin, upper Paraná River basin. Data were gathered from recent information published in specialized literature and records for ichthyology collections. This update reports the occurrence of 152 fish species distributed in 8 orders, 31 families, and 89 genera. Non-native species accounted for 20% of all species, and the construction of the Itaipu Power Plant and its fish ladder were the main vectors of introduction. Three percent of the species were endangered, and 11% were classified as migratory. The Piquiri River basin harbors a large number of species, some of which are rare, endangered, migratory, endemic, and even unknown by science. Because of this, maintaining the integrity of this river basin will support the persistence of regional biodiversity.

          Translated abstract

          Resumo: O conhecimento das espécies de peixes existentes em uma bacia hidrográfica é condição mínima necessária para a implantação de qualquer medida de manejo dos recursos hídricos e pesqueiros. Dessa forma, o objetivo deste estudo foi realizar uma atualização da composição das espécies de peixes da bacia do rio Piquiri, sistema do alto rio Paraná, proveniente de recentes informações contidas em estudos divulgados na literatura especializada e registros de espécies depositadas em coleções ictiológicas. A atualização do levantamento ictiofaunístico da bacia do rio Piquiri revelou a ocorrência de 152 espécies, as quais foram distribuídas em oito ordens, 31 famílias e 89 gêneros. Vinte por cento das espécies foram consideradas não nativas. O principal vetor de introdução foi a construção da barragem de Itaipu e seu sistema de transposição. Três por cento das espécies apresentaram alguma ameaça de extinção e 11% foram classificadas como migradoras. A bacia do rio Piquiri comporta grande número de espécies, algumas delas raras, ameaçadas de extinção, migradoras, endêmicas e até mesmo desconhecidas pela ciência. Dessa forma, a manutenção da integridade da bacia promoverá a persistência da biodiversidade regional.

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          The Role of Recreational Fishing in Global Fish Crises

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            Fish-passage facilities as ecological traps in large neotropical rivers.

            At present most of the large rivers of South America are impounded. Management plans historically have relied on the construction of fish passages, specifically ladders, to mitigate the impact of these waterway blockages on fisheries and biodiversity. Nevertheless, the design of these facilities is not ecologically sound and they are not monitored continually. Consequently, the real role of South American fish passages in fisheries and biodiversity management is unclear and the results of some studies suggest that ladders are problematic in fish conservation. We examined the characteristics and negative aspects of fish passages within a larger context and considered the notion that these facilities are ecological traps in some Brazilian impoundments. Four conditions are required to characterize a fish passage as an ecological trap: (1) attractive forces leading fish to ascend the passage; (2) unidirectional migratory movements (upstream); (3) the environment above the passage has poor conditions for fish recruitment (e.g., the absence of spawning grounds and nursery areas); and (4) the environment below the passage has a proper structure for recruitment. When these conditions exist individuals move to poor-quality habitats, fitness is reduced, and populations are threatened. To exemplify this situation we analyzed two case studies in the upper Paraná River basin, Brazil, in which the four conditions were met and migratory fish populations were declining. If passages work as ecological traps, regional fisheries will be in danger of collapse and conservation policies toward biodiversity will become more difficult and ineffective. The situation demands the closing of the passage in conjunction with alternative management actions to preserve system functionality, especially the conservation of critical habitats downstream and the restoration of damaged habitats in the region.
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              Fish assemblages in Neotropical reservoirs: Colonization patterns, impacts and management

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                bn
                Biota Neotropica
                Biota Neotrop.
                Instituto Virtual da Biodiversidade | BIOTA - FAPESP (Campinas, SP, Brazil )
                1806-129X
                1676-0611
                April 2018
                : 18
                : 2
                : e20170350
                Affiliations
                [1] Toledo Paraná orgnameUniversidade Estadual do Oeste do Paraná orgdiv1Curso de Engenharia de Pesca orgdiv2Grupo de Pesquisas em Recursos Pesqueiros e Limnologia Brazil
                [5] Maringá Paraná orgnameUniversidade Estadual de Maringá orgdiv1Programa de Pós-Graduação em Ecologia de Ambientes Aquáticos Continentais Brazil
                [4] Maringá Paraná orgnameUniversidade Estadual de Maringá orgdiv1Coleção Ictiológica do Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura Brazil
                [6] Maringá Paraná orgnameUniversidade Estadual de Maringá orgdiv1Centro de Ciências Biológicas orgdiv2Departamento de Biologia e Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura Brazil
                [3] Cascavel Paraná orgnameUniversidade Estadual do Oeste do Paraná orgdiv1Centro de Ciências Biológicas e da Saúde Brazil
                [2] Toledo Paraná orgnameUniversidade Estadual do Oeste do Paraná orgdiv1Programa de Pós-Graduação em Recursos Pesqueiros e Engenharia de Pesca orgdiv2Grupo de Pesquisas em Recursos Pesqueiros e Limnologia Brazil
                Article
                S1676-06032018000200305
                10.1590/1676-0611-bn-2017-0350
                2b6fcb7f-b098-45e9-844e-c524aeb8bab6

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 24 March 2017
                : 06 March 2018
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 78, Pages: 0
                Product

                SciELO Brazil


                Levantamento ictiofaunístico,conhecimento das espécies,preservação,bacia do alto rio Paraná,Ichthyofaunal survey,species knowledge,preservation,upper Paraná River basin

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