Maternal versus environmental constraints on the oocyte size of a marine pelagophil fish
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We investigated maternal body size and environmental effects on the oocyte size of the Atlantic sardine, Sardina pilchardus, a marine pelagophil, using a novel, oocyte stage-specific approach which takes into account the spawning lag. In particular, we focused on anatomical constraints imposed by the maternal body cavity to the growth of the ovary and its oocytes during the course of vitellogenesis (VIT) and oocyte maturation (OM). We analyzed variability in oocyte size in VIT and OM ovaries as a factor of maternal size, ambient temperature (SST) and preservation medium (formalin vs. ethanol) using the spawning lag of recent and imminent spawners, respectively, as a covariate. We showed that oocyte size correlates with maternal size in OM ovaries but not in VIT ovaries. More specifically, 10 cm difference in maternal body length corresponds to 0.112 mm2 (or 12 %) difference in the cross section of fully hydrated oocytes just previous to ovulation. On the other hand there was no inverse relationship between OM oocyte size at spawning and batch fecundity. Ambient SST was not an important determinant of hydrated oocyte size since the same 12 % difference in oocyte size was estimated for the entire SST range of the study. We suggest that these stage-specific differences in the effect of maternal size on oocyte size are due to a functional relationship between the abdominal volume and ovarian size.
KeywordsOocyte Maturation Advanced Very High Resolution Radiometer Advanced Very High Resolution Radiometer Oocyte Size Batch Fecundity
This work was supported by the National Biological Sampling Programme (PNAB/EU DCF) for DEPM surveys funded by the European Union. Thanks are due to Dr. M.M. Angelico for helpful recommendations. Particular thanks are due to all IPMA staff that contributed to the collection of DEPM samples and the histological preparations. The work of M. Rakka, T. Vavalidis and E. Mantzouki was partly done within the framework of a collaboration between the School of Biology of AUTH and IPMA under the ERASMUS PLACEMENT PROGRAMME.
Compliance with ethical standards
Conflict of interest
We have no conflicts of interest to disclose.
Research involving human participants and/or animals
The present study did not involve any human participants and or animals.
We did not conduct any healthcare interventions to human participants.
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