Abstract
AbstractEarly gonadal development in Russian (Acipenser gueldenstaedtii Brandt, 1869) and Siberian sturgeon (Acipenser baerii Brandt & Ratzeburg, 1833) reared in controlled conditions from dph 1–439 (days post hatching) was studied using histological methods. Migrating primordial germ cells (PGCs) were observed in both species on dph 1. On dph 25 in both species gonad primordia developed in gonadal ridges. In dph 115 juveniles two types of gonad were distinguished, putative ovary and putative testicle. Meiotic activity was observed in ovaries on dph 197, while in testicles the first meiotic divisions were observed much later, on dph 439 and only in several Siberian specimens. The presence of Vasa protein was confirmed exclusively in germ cells during gonadogenesis, indicating that Vasa is a good marker of germinal cells also in Acipenseridae. Vasa protein displayed a nuage association or nuage‐like localization. Some differences in the level of Vasa protein expression during male and female gonad development were also observed. In the gonads of both investigated sturgeon species the PCNA (proliferating cell nuclear antigen)‐positive reaction was observed first in oogonia, while in spermatogonia at approximately 115 dph which was correlated with active mitotic divisions of germ cells. Surprisingly, meiotic oocytes arrested in diplotene also demonstrated strong PCNA‐positive germinal vesicle.
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