Mapeamento de arraias fluviais do gênero Potamotrygon no rio Tietê, Estado de São Paulo
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Data
2021-12-01
Autores
Moreira, Isleide Saraiva Rocha
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
As arraias fluviais são peixes adaptados às águas dos rios e lagos e são encontradas nas bacias hidrográficas da América do Sul. A expansão da família zoológica no médio e alto rio Paraná iniciou-se após o represamento do Salto de Sete Quedas, atingindo a foz dos rios Paranapanema e Tietê, com invasão de um amplo trecho do baixo rio Tietê. Foram mapeadas dezesseis arraias do gênero Potamotrygon, por meio do monitoramento do produto pesqueiro dos pescadores, entre os municípios de Pereira Barreto e Buritama, Estado de São Paulo. As arraias aproveitam-se das eclusas das Usinas Hidrelétricas, avançando rapidamente. Não são animais agressivos, contudo, se pisoteadas ou manipuladas, chicoteiam a cauda contra o agressor. A arraia possui de 1 a 4 ferrões recobertos por um epitélio produtor de peçonha e podem causar importantes envenenamentos em pescadores e banhistas. O avanço destes peixes peçonhentos em áreas onde não existiam requer programas de esclarecimentos e interação com a comunidade para evitar acidentes graves em banhistas e pescadores e extermínio sem razão dos animais.
The freshwater stingrays are fish adapted to waters of the rivers and lakes, only existing in the hydrographic basins of South America. The expansion of the zoological family in the middle and upper Paraná River started after the damming of the Salto de Sete Quedas, reaching the mouth of the Paranapanema and Tietê Rivers and colonizing upstream in the stretch of the lower Tietê River. Sixteen freshwater stingrays of the genus Potamotrygon were mapped, by monitoring the fishery product of fishermen, between the municipalities of Pereira Barreto and Buritama, State of São Paulo. The stingrays take advantage of the locks of the Hydroelectric Plants, advancing rapidly. They are not aggressive animals, however, if trampled or manipulated, they whip the tail that has 1 to 4 stingers covered by a venom-producing epithelium and can cause important injuries to fishermen and bathers. The advancement of these venomous fish in areas where they did not exist requires programs for clarification and interaction with the community, to avoid serious accidents with envenomations in bathers and fishermen and the unreasonable extermination of animals.
The freshwater stingrays are fish adapted to waters of the rivers and lakes, only existing in the hydrographic basins of South America. The expansion of the zoological family in the middle and upper Paraná River started after the damming of the Salto de Sete Quedas, reaching the mouth of the Paranapanema and Tietê Rivers and colonizing upstream in the stretch of the lower Tietê River. Sixteen freshwater stingrays of the genus Potamotrygon were mapped, by monitoring the fishery product of fishermen, between the municipalities of Pereira Barreto and Buritama, State of São Paulo. The stingrays take advantage of the locks of the Hydroelectric Plants, advancing rapidly. They are not aggressive animals, however, if trampled or manipulated, they whip the tail that has 1 to 4 stingers covered by a venom-producing epithelium and can cause important injuries to fishermen and bathers. The advancement of these venomous fish in areas where they did not exist requires programs for clarification and interaction with the community, to avoid serious accidents with envenomations in bathers and fishermen and the unreasonable extermination of animals.
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Palavras-chave
Úlceras, Picadas e mordeduras, Animais peçonhentos, Animais venenosos, Arraias-de-água-doce, Potamotrygon, Tietê, Rio, Freshwater stingrays, Tietê river, Ulcers, Bites and stings, Venomous animal