Swimming performance of the small characin Bryconamericus stramineus (Characiformes: Characidae)

• Autor(a) principal: Castro,Miriam A. de
• Data de Publicação: 2010
• Outros Autores: Santos,Hersília de A., Sampaio,Francisco A. C., Pompeu,Paulo S.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Zoologia (Curitiba. Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000600015
• topic: Critical speed; fish passage; prolonged swimming; Tetragonopterinae

Very little research has been conducted on the swimming capacity of Neotropical fish. The few studies available have focused on large migratory species. The present study used fixed and increasing velocity tests to determine prolonged and sustained speeds of the "pequira", Bryconamericus stramineus Eigenmann, 1908, a small, abundant species found in fish passages implemented at the Paraná basin, Brazil. The results of increasing velocity tests showed significant relationships between critical speeds, total and standard lengths, and body weight. When compared with other Neotropical fish, the "pequira" is able to swim faster than individuals of other species of similar length. The point of change from sustained to prolonged swimming was found to occur at an approximate speed of 8.7 lengths per second. These data provide guidance and criteria for design and proper maintenance of structures such as fishways, fish screens and other systems that aim to facilitate or avoid upstream passages as part of management strategies.