Reproductive Biology of the stingray Hypanus marianae, an endemic species from Southwestern Tropical Atlantic Ocean


The Brazilian Large-eyed stingray Hypanus marianae is the smallest species of the family Dasyatidae in Brazil. This study aims to provide data on the reproductive biology of this species captured in artisanal fisheries. A total of 299 individuals of H. marianae were recorded at monitoring landings and adult male to female sex ratio was significantly different (1:2.9), showed spatial segregations between males and females. The range was from 13.0 to 36.2cm in disc width (DW). Females reached greater size and mass (36.2cm DW and 1855g) than males (29.3 cm DW and 915g). Its reproductive systems analyses were studied based on 81 preserved specimens. The DW50 parameter was estimated at 26.1cm DW for females, whereas for males was 23.8cm DW. Only the left uterus is functional, and birth size was estimated at between 13.0–14.0cm DW. Vitellogenesis occurred concurrently with a short gestation (shorter than 6 months) and uterine fecundity is only one embryo per reproductive cycle, which seems to be asynchronous.

Keywords. maturity, fecundity, birth, embryos, Dasyatidae.

Biografia do Autor

Ana Rita Onodera Palmeira Nunes, Universidade Federal do Maranhão (UFMA)
Departamento de Oceanografia e Limnologia, área de ecologia e conservação de elasmobrânquios


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