This technique is accurate but invasive and stressful, time consuming, and not an effective tool for handling a large number of fish. PI indicates morphogenetic changes in the ovarian follicle occurring during late vitellogenesis and leading to maturational competence.
Oocyte PI is a ratio of the distance of the germinal vesicle from the animal pole to the oocyte animal-vegetal axis diameter.
Optimizing harvest time could extend the caviar production season.Ĭurrently, the only means to assess ripeness of white sturgeon ( Acipenser transmontanus, Acipenseridae) females and the proper time of harvest is measurement of oocyte polarization index (PI) requiring a surgical biopsy. Accurately predicting maturity is also commercially important in aquaculture and stock management if a uniform and consistent egg size and firmness are to be obtained and caviar yields are to be optimized. Sturgeon brood stock management in aquaculture and in conservation programs for endangered species will benefit from the improved staging of fish by maturity.
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