Tagliafico A, Rangel S, Broadhurst M K
Escuela de Ciencias Aplicadas del Mar, Núcleo de Nueva Esparta, Universidad de Oriente, Boca de Río, Isla de Margarita, Venezuela.
National Marine Science Centre, Southern Cross University, Coffs Harbour, NSW, Australia.
J Fish Biol. 2017 Oct;91(4):1062-1071. doi: 10.1111/jfb.13401. Epub 2017 Sep 12.
The maturity and reproduction of the Atlantic angel shark Squatina dumeril were assessed using 77 females (29·2-110·4 cm total length; L ) and 269 males (58·7-108·2 cm L ) harvested by artisanal gillnetters off Venezuela. The biased sex ratio implied segregation or sex-specific gear selectivity. Based on the development of the reproductive tract, 50% L at sexual maturity (L , mean ± s.e.) for females and males were estimated at 86·14 ± 0·64 and 81·55 ± 0·12 cm, respectively. Uterine fecundity ranged between one and six and with a maximum embryo size of 25·7 cm L . Gravid females were observed from August to December, including those close to parturition and while the gestation period was not confirmed, the size of ovarian follicles among some specimens implied protraction. The low fecundity of the species supports close monitoring of catches.
利用委内瑞拉手工刺网渔民捕获的77条雌鲨（全长29.2 - 110.4厘米；L）和269条雄鲨（全长58.7 - 108.2厘米；L）对大西洋扁鲨的成熟度和繁殖情况进行了评估。偏态的性别比例意味着存在隔离或性别特异性渔具选择性。根据生殖道的发育情况，估计雌鲨和雄鲨性成熟时的50%全长（L，平均值±标准误）分别为86.14±0.64厘米和81.55±0.12厘米。子宫繁殖力在1至6之间，最大胚胎全长为25.7厘米。8月至12月观察到怀孕雌鲨，包括临近分娩的雌鲨，虽然妊娠期未得到确认，但一些标本中卵巢卵泡的大小表明妊娠期较长。该物种的低繁殖力支持对渔获量进行密切监测。
