In biology, the gonadosomatic index (GSI) is the calculation of the
gonad
A gonad, sex gland, or reproductive gland is a mixed gland that produces the gametes and sex hormones of an organism. Female reproductive cells are egg cells, and male reproductive cells are sperm. The male gonad, the testicle, produces ...
mass as a proportion of the total
body mass. It is represented by the formula:
GSI = onad weight / total tissue weight× 100
It is a tool for measuring the
sexual maturity of animals in correlation to
ovary
The ovary is an organ in the female reproductive system that produces an ovum. When released, this travels down the fallopian tube into the uterus, where it may become fertilized by a sperm. There is an ovary () found on each side of the bod ...
development and
testes development. The index is frequently used as reporting point in OECD test guideline, which may be used as indication or evidence of potential endocrine disruption effect of chemicals in regulatory framework (EFSA and ECHA, 2017).
[ Guidance for the identification of endocrine disruptors in the context of Regulations (EU) no 528/2012 and (EC) 1107/2009.][ World Health Organisation/ International Programme for Chemical Safety, 2002 ]
References
Measurement
Zoology
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