https://researchportalplus.anu.edu.au/en/publications/the-evolution-of-gonad-expenditure-and-gonadosomatic-index-gsi-in/
The evolution of gonad expenditure and gonadosomatic index (GSI) in male and female...
the evolution
https://evols.library.manoa.hawaii.edu/items/30a8cb29-67f1-49ea-af5c-8b889f9e7c52
Variations in Gonadosomatic Index, Gonadal Development and Spawning Induction of Spotted Scat...
This study evaluated variations in gonadosomatic index (GSI), gonadal development stages, and hormonal spawning induction of Scatophagus argus in captivity....