Forming and Realization of Fecundity in the Black Sea Turbot Scophthalmus maeoticus (Scophthalmidae) at the South-Western Shelf of the Crimean Peninsula
2020
Giragosov, V. E.
The reproductive characteristics of the females of the Black Sea turbot Scophthalmus maeoticus were studied on the materials collected in 2007–2018 at the south-western shelf of the Crimean Peninsula. The spawning of the Black Sea turbot in this area lasts for two months on average, from the second decade of April to the end of the first decade of June; the most intensive spawning is observed during the first and the second decades of May. The average number of vitellogenic oocytes is 4368 thousands per female (average somatic body weight of 2.96 kg); these oocytes form potential fecundity before the spawning starts. On average, 73% of potential fecundity (3189 thousand oocytes) is realized during the spawning period. The vitellogenic oocytes remaining in the ovaries undergo resorption for 2–3 months after spawning. Batch fecundity averages 412 thousand oocytes (12.9% of realized fecundity); according to our estimates, each female spawns seven to eight times on average during the spawning season.
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