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vol.65 issue1Endemic and threatened tetrapods in the restingas of the biodiversity corridors of Serra do Mar and of the central da Mata Atlântica in Eastern BrazilHistochemical localization of enzymes and lipids in the ovary of a vespertilionid bat, Scotophilus heathi, during the reproductive cycle author indexsubject indexarticles search
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Brazilian Journal of Biology

Print version ISSN 1519-6984On-line version ISSN 1678-4375

Abstract

SANTOS, R. N et al. Hystological analysis of ovarian development of the characiform Oligosarcus hepsetus (Cuvier, 1829) in a Brazilizn Reservoir. Braz. J. Biol. [online]. 2005, vol.65, n.1, pp.169-177. ISSN 1678-4375.  http://dx.doi.org/10.1590/S1519-69842005000100020.

A histological analysis was performed of the ovarian development of Oligosarcus hepsetus (Cuvier, 1829), a medium-sized carnivorous Characiform species in the Lajes reservoir, Brazil. A total of 125 fishes, collected monthly between April 2001 and June 2002 were examined by routine macroscopic and histological techniques. Eight phases of the oocyte development were described, and 4 stages and 4 sub-stages of gonadal development were proposed. Spawning in reservoirs, similarly to that in rivers, is in batches, which favors juvenile survival and suggests that the impoundment of this area did not influence the reproductive strategy of this very successful species in a dammed environment.

Keywords : reproductive strategy; spawns; Characiforms; reservoirs; Brazil.

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