期刊
JOURNAL OF APPLIED ICHTHYOLOGY
卷 37, 期 1, 页码 64-72出版社
HINDAWI LTD
DOI: 10.1111/jai.14128
关键词
Alosa aestivalis; fecundity pattern; multiple spawning; oocyte recruitment
资金
- Hellenic Foundation for Research and Innovation (HFRI)
- General Secretariat for Research and Technology (GSRT)
The study on ovarian dynamics of anadromous blueback herring in Connecticut River reveals characteristics of determinate fecundity, with the recruitment intensity of oocytes decreasing gradually across different spawning phases, possibly as an adaptation to the high energetic expenditure of upstream spawning migration.
We analyzed ovarian dynamics of anadromous blueback herring, Alosa aestivalis, in Connecticut River with the principal aim of exploring oocyte recruitment and how it shapes the fecundity pattern. We examined the oocyte release strategy and analyzed spawning cyclicity by linking oocyte growth to the degeneration of postovulatory follicles. Females were accordingly classified as pre-spawners, early and late active spawners, and oocyte recruitment intensity was compared among the different spawning phases. Oocyte recruitment occurred continuously and in parallel with spawning activity, a pattern which is diagnostic of indeterminate fecundity. However, both fecundity and oocyte recruitment intensity progressively decreased (tapered) throughout spawning, until the ovary was depleted of vitellogenic oocytes. There was no massive atresia of vitellogenic oocytes at the end of the spawning season, which is atypical of indeterminate spawners. We propose that tapering in oocyte recruitment and fecundity is an adaptation to the high energetic expenditure of the upstream spawning migration.
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