Resumo

OLAYA-NIETO¹, CHARLES W.; HERNANDEZ ROSSO¹, DAVID F.  e  AYARZA PEREZ¹, EDGAR. Reproductive Biology of Liso Rhamdia quelen (Pisces: Heptapteridae) in the Sinu River, Colombia. Acta biol.Colomb. [online]. 2010, vol.15, n.3, pp.61-74. ISSN 0120-548X.

ABSTRACT The reproductive biology of Liso (Rhamdia quelen) in the Sinu river was studied. The fishes were collected between January and December 2005, with lengths ranging 15,5 -37 cm of total length (TL) and 28 - 486 g of total weight. The gonads were placed in Gilson solution, the Vazzoler scale was applicated and sexual proportion, sexual maturity index, spawning season, the length at first maturity, ovocites’s diameter and fecundity were estimated; 207 females, 130 males and 1 undifferentiated were evaluated, with sexual proportion female: male of 1,6:1, different from expected. The length at first maturity was estimated in 24 cm TL for combined sexes; average ovocites’s diameter was 963 mm and average fecundity was estimated in 26.305 ovocites, with better equation F=2960,61 ^0,88, r=0,94, n=125. The Liso is a fish with asynchronous oocyte development in more than two groups, with partial spawning throughout the year.

Palavras-chave : fecundidad; Liso; Fecundity; Reproductive biology; Spawning season.

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