全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

Biología reproductiva de la raya Rhinoptera bonasus (Elasmobranchii) en el sureste del Golfo de México

Keywords: length at maturity, reproductive cycle, rhinoptera bonasus, ray, gulf of mexico.

Full-Text   Cite this paper   Add to My Lib

Abstract:

the cownose ray rhinoptera bonasus is one of the most abundant batoid species in southeastern gulf of mexico, where it is occasionally caught and salt-dried for human consumption. to date, there are no estimates of the reproductive parameters which are needed to assess the dynamics of the local population of this species, and its vulnerability to fisheries. the analysis of 136 females with a size range of 43-106 cm disc width (dw) and 56 males with a size range of 43-93 cm dw, allowed to estimate that the lengths at maturity (dw50%) are 89.1 cm dw and 76.4 cm dw for females and for males, respectively. the female reproductive cycle is apparently biennial. the gestation lasts close to 12 months, gestation and vitellogenesis are consecutive, and ovulation and parturition occur from mid-march to mid-june. the results indicate a brood size of one and the lengths at birth ranged between 37.5 and 43 cm dw. apparently, the sizes at maturity estimated for the southeastern and the northern gulf of mexico are different, because the data for the northern gulf of mexico indicate dw values of 65.3 and 64.2 cm for females and males, respectively. the biennial reproductive cycle of the southeastern gulf of mexico population seems different from that of the northwestern atlantic, which is apparently annual.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133