Chojnacki J., Palczewski P., 1981. Techniques of otolith treatment for age and growth determination of three white-blooded fish species. Acta Ichthyol. Piscat. 11 (2): 39-46.

To determine age and growth rate of the white-blooded fish from their otoliths, some special techniques of otolith preparation is called for. Decalcination in 5% HNO3 yields positive results for Chaenocephalus aceratus only. Burning of otoliths is suitable for Champsocephalus gunnari and Chaenocephalus aceratus, the best results being produced for Pseudochaenichthys georgianus.