期刊
MARINE AND FRESHWATER RESEARCH
卷 72, 期 1, 页码 140-148出版社
CSIRO PUBLISHING
DOI: 10.1071/MF20045
关键词
reproductive strategy; indeterminate fecundity; western Atlantic
资金
- Fundacao para a Ciencia e a Tecnologia (FCT) [UID/MAR/04292/2019, UID/Multi/04326/2019, CEECIND/02705/2017, CEECIND/01528/2017, SFRH/BPD/70200/2010, SFRH/BPD/108917/2015]
- Fundação para a Ciência e a Tecnologia [UID/Multi/04326/2019, UID/MAR/04292/2019, SFRH/BPD/108917/2015, CEECIND/01528/2017/CP1387/CT0040] Funding Source: FCT
The European boarfish Capros aper has an indeterminate fecundity, with a mean relative batch fecundity of 50 oocytes per gram eviscerated weight and an annual fecundity of 4020 oocytes per gram eviscerated weight. The study found at least two important spawning events for the fish, one in winter and the other in summer, with variations in E2 concentrations throughout the year indicating different spawning phases.
The boarfish Capros aper is one of the most commonly discarded non-commercial species in the International Council for the Exploration of the Sea (ICES) Subdivision VIII in the Atlantic. An increasing interest in this fishery and an incomplete knowledge on the status of the stock justified the present investigation focused on the determination of fecundity type and its estimation, supported by sex steroid profiles for 17 beta-oestradiol (E2), 11-ketotestosterone and 17,20 beta-dihydroxypregn-4-en-3-one (17,20 beta-P). C. aper was found to have indeterminate fecundity with a mean relative batch fecundity during the spawning peak of 50 oocytes g(-1) eviscerated weight (W-E) and a mean relative annual fecundity of 4020 oocytes g(-1) W-E. E2 variations throughout the year indicated the existence of at least two important spawning events, one in winter (January-February) and the other in summer (June-August), with concentrations in females increasing from those with growing oocytes in the developing phase to those in the spawning capable phase. Higher E2 concentrations were also found from 2000 to 2400 hours and from 0800 to 1200 hours suggesting more intense vitellogenesis activity during the night and in the morning, in contrast to 17,20 beta-P concentrations, which were higher between 1200 and 2000 hours, suggesting a more intense spawning activity during this period.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据