| Oocyte degradation at the trophoplasmic growth phase under unfavorable conditions of keeping maturing sturgeon female |
| Paper ID : 1005-ICIAQUA |
| Authors |
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Ian Merkulov *1, Ian Merkulov2, Ivan Markov3 1Russia 2State regional Centre for Sturgeon gene pool conservation 3Sturgeon school |
| Abstract |
| The reproductive system of females at the stage of completion of the sexual cycle (end of maturity stage III and transition to stage IV) in conditions that do not correspond to the ecological preferences of the species is characterized by increased sensitivity to the impact of additional adverse factors. As a result of such impact in the gonads, the risk of irreversible processes of oocyte degeneration at the phase of trophoplasmic growth increases, which manifests itself in the loss of a part of oocytes ability to ovulate. The polarization index values exceeding 0.30-0.32 as well as the polarization index variability (difference between the minimum and maximum values) close to or exceeding the value of 0.19 indicate the processes of oocyte degradation occurring during the period of trophoplasmic growth. The process of oocyte degradation is accompanied by a change in the echogenicity of eggs, which is shown on sonograms. This message is preliminary. Currently, we continue to develop algorithms to reduce the negative impact of unfavorable conditions on oocyte development during trophoplasmic growth. |
| Keywords |
| sturgeon, gametogenesis, trophoplasmic growth, oocyte, oocyte polarization index |
| Status: Abstract Accepted (Oral Presentation) |