Morphology of gonads, maturity and spawning season of Loricariichthys spixii (Siluriformes, Loricariidae) in a Subtropical Reservoir

Brazilian Archives of Biology and Technology

Silvana Duarte²  Francisco Gerson Araújo²  Armando Sales¹  Nilo Bazzoli¹ 

[1] ,Universidade Federal Rural do Rio de Janeiro Laboratório de Ecologia de Peixes Seropédica RJ ,Brasil

关键词: Loricariidae;    reservoir;    fish reproduction;    gonad morphology;    Brazil;   

DOI  :  10.1590/S1516-89132007000700013

来源: SciELO

【 摘 要 】

The gonad morphology and spawning season of Loricariichthys spixii in Lajes reservoir were described based on 175 males and 613 females. Cells from the spermatogenic lineage were divided in four phases: spermatogonia (primary and secondary), spermatocytes (primary and secondary), spermatids and spermatozoa, and the cells from the ovocitarian lineage were divided in four phases: primary oocytes (O1), previtellogenic oocytes (O2), cortical vesicle oocytes (O3) and yolk globules or vitellogenic (O4). Five gonadal stages were described for the males/females according to oocytes and spermatogenic lineage cells distribution: resting (1); initial maturation (2a); advanced maturation (2b); partially spent/spawned (4a); totally spent/spawned (4b). Spawning was iteroparous, occurring throughout the year. Resting/recover occurred in July/August for the females coinciding with lower temperature and rainfall and decreasing water level. The wide spawning period was the part of the strategy developed to withstand environmental pressure and to get success in this oligotrophic and poorly structured environment.

【 授权许可】

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