Body indexes of viola Loricariichthys anus in pre-reproductive period

  • SRN Piedras
  • C Costenaro-Ferreira
  • RA Tavares
  • JM Fernandes
  • JLOF Pouey
Keywords: Loricariidae, gonadosomatic index, hepatosomatic index, allometric coefficient


This study was undertaken to understand the variation of corporal indexes of viola as an indicator of the pre-reproductive period, contributing to the management and conservation of this important regional fishery resource. Fifty individuals, 25 males and 25 females were evaluated. The data measured were: Length, weight, gonadosomatic and hepatosomatic indexes, allometric coefficient and allometric condition factor. Viola showed no growth difference between males and females during the period before reproduction, however, the correlation between gonadosomatic and hepatosomatic indexes are indicators of the proximity of the spawning period.
Technical Note