Suquet, M. and Billard, R. and Cosson, J. and Dorange, G. and Chauvaud, L. and Mugnier, C. and Fauvel, C. (1994) Sperm features in turbot (Scophthalmus maximus): a comparison with other freshwater and marine fish species. Aqua. Living Resour., pp. 283-294
| Species | Development state | Trait | Primary Data | Secondary Data |
| Cyprinus carpio | Male | Maximum GSI value | 7 | 7.0 percent |
| Rutilus rutilus | Male | Maximum GSI value | 9 | 9.0 percent |
| Esox lucius | Male | Maximum GSI value | 2-3 | 2.5 percent |
| Oncorhynchus mykiss | Male | Maximum GSI value | 10 | 10.0 percent |
| Salmo trutta fario | Male | Maximum GSI value | 6 | 6.0 percent |
| Ictalurus punctatus | Male | Maximum GSI value | 0.3 | 0.3 percent |