Produção Nacional
Revisado por pares
Relação peso-comprimento e atividade reprodutiva do Leporinus piau Fowler, 1941, capturados em uma pequena usina hidrelétrica desativada
2013; Editora da Universidade Estadual de Maringá (Eduem); Volume: 35; Issue: 3 Linguagem: Inglês
ISSN
1807-863X
AutoresGeraldo Eustáquio Valente Padilha, Júnia Aparecida Bernardes Afonso de Carvalho, Orion Boncompagni-Júnior, Fabrício Flávio Theophilo Domingos, Ralph Gruppi Thomé,
Tópico(s)Fish Ecology and Management Studies
ResumoReproductive activity of ‘piau gordura’ Leporinus piau was studied using biometric, macroscopic and microscopic analysis. A total of 74 specimens of L. piau were collected quarterly from January to December 2005 in a small deactivated hydropower plant located at Jorge Pequeno Stream and preserved in a fixative solution until analysis. The alterations after fixation were evaluated. The stages of gonadal maturation were determined by histology and gonadosomatic index (GSI). The females and males in the spawning capable and regressing stage were registered from October to December. L. piau is total spawning and the HSI (hepatossomatic index), SRI (stomach repletion index) and CFI (coelomic fat index) of females and males did not showed a statistical difference. However they were numerically different between the stages of maturation. For both sexes, the smallest specimens captured during the reproductive activity have measured around 8.3 cm in total standard. The length-weight relationship observed for the parameter ‘b’ was 3.01 and the parameter ‘a’ was 0.02. This study demonstrates the importance of Jorge Pequeno Stream in the reproductive activity of migratory fish in the upper Sao Francisco river.
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