Vitellogenin
Vitellogenin : Vitellogenin is the major protein constituent of fish eggs, used as a nutrient supply by the developing fry. Female fish produce vitellogenin in their livers under stimulation by oestrogens, and it is then transported to the eggs via the blood. The natural level of vitellogenin in male fish blood is very low in comparison to normal and spawning females. However, exposure of male fish to some chemicals results in a drastic increase in the level of circulating vitellogenin. This is thought to be as a result of oestrogenic activity of these chemicals
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