Thanks for sharing this, let me know that if fish age is 80 year and so on then how can we calculate age from this , either the rings on the scales become dense or stop at some age. Second...when light fall on slow and fast growth rings...reflect light shows pale and indirect (indirect in books it indirect in slow growth and direct in fast growth , is it correct? Please) shows dark color. While in fast it is reverse only direct has written in direct instead of indirect