Flavonoids by Andersen, Markham

By Andersen, Markham

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A Early prometaphase; B metaphase; C anaphase; D late telophase of the I meiotic division; E metaphase of the II meiotic division (mature egg). MF Maturation funnel; MSI spindle of the I meiotic division; MSII spindle of the II meiotic division; PB polar body; ZR II zona radiata interna Changes in the properties of the oocyte's surface layer commence just before the GV breakdown and then proceed quickly. These changes include the appearance of contractility in the cortical layer of the cytoplasm and alteration of its permeability, followed somewhat later by the appearance of capacity for cortical reaction.

Stellatus spawning grounds), about 9% of females were ripe (with eggs leaking out) and the others had gonads at the completed stage IV of maturity (Veshchev 1979). Correspondingly, at the Volgograd sturgeon hatchery, practically all A. stellatus females responded to pituitary injections by giving good-quality eggs. Downstream of the Fedorovskii dam on the Kuban' river, A. stellatus females gather in May; most of them (90%) have gonads at the completed stage IV of maturity (Badenko et al. 1976).

In the experiments of O. B. Chernyshev (see Sadov 1957; Kazanskii 1957a) and P. S. Yushchenko (pers. ), the females matured after pituitary injection and, placed in a holding tank with a male, behaved in a similar way: they did not hold eggs in the body cavity and started spawning which lasted a few hours. At hatcheries, females and males injected with pituitary suspension are kept separately, in different tanks. Under these conditions, the female does not display spawning behavior and the ovulated oocytes accumulate in the body cavity; only a few of them are released in water.

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