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In biology, the gonadosomatic index (GSI) is the calculation of the gonad mass as a proportion of the total body mass. It is represented by the formula:[1]
GSI = [gonad weight / total tissue weight] × 100
It is a tool for measuring the sexual maturity of animals in correlation to ovary development and testicle 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).[2][3]
^Anderson, Richard O.; Gutreuter, Stephen J. (1983). "Chapter 15. Length, weight and associated structural indices". In Nielsen, Larry A.; Johnson, David Lawrence (eds.). Fisheries techniques. Bethesda, Md.: American Fisheries Society. pp. 283-300. ISBN 9780913235003.
^ Guidance for the identification of endocrine disruptors in the context of Regulations (EU) no 528/2012 and (EC) 1107/2009.
^ World Health Organization/ International Programme for Chemical Safety, 2002
and 18 Related for: Gonadosomatic index information
In biology, the gonadosomaticindex (GSI) is the calculation of the gonad mass as a proportion of the total body mass. It is represented by the formula:...
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somatic lipids increases to supply energy for migrating and spawning, gonadosomaticindex and oocyte diameter increase, gonadotropin hormone (GTH-II) production...
Retrieved 25 April 2021. Wagle, Suresh Kumar (2015). "Studies on gonadosomaticindex, fecundity and hatchability of domesticated stock of asala Schizothorax...
affected an individual. These indices include the hepatosomatic index, gonadosomaticindex and also the condition factors (shakumbila, 2014). In landmark-based...
a temperature range 20–30 °C and >50 mm rainfall. The threshold gonadosomaticindex (GSI) for breeding is 10.5 units in females. Females also need to...
Fontoura, et al. also examined reproductive details and found that the gonadosomaticindex (GSI) values were highest in November through February. These data...
returned unharmed if possible. During a study it was found that the gonadosomaticindex for the females was higher in the winter, which means that this specie...
females are about 68.9 mm in length while males are 54 mm. The gonadosomaticindex (GSI) for both males and females increases after August and remains...
found that spermatic cyst diameter, germinal epithelium depth, and gonadosomaticindex were smaller in the injected males compared to males injected with...
"Reproductive biology of the bullseye puffer Sphoeroides annulatus : Gonadosomaticindex and its suitability for estimating length at maturity". Journal of...
length. Egg diameter ranges from 0.3mm - 1.6mm, depending on the gonadosomaticindex (GSI), with larger eggs being present in females with a high GSI...
and a lower gonadosomastic index. Contrarily, larger gonads show more mature gametes and exhibit a bigger gonadosomaticindex. Gonads in Plaxiphora albida...
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