main_board said:Ok, I was way off. I was just curious as there was a presentation at CIAC regarding aging via beak increments as well. However, I believe they were working with upper beaks from ommastrephid squid paralarva. It was pretty cool because they got a one increment per day rate of growth for the beaks as well. Anyways, I don't really know where I was/am going with this...good luck with your beak work.
It appears also that O.vulgaris lay down daily rings on their beaks, the upper one being the most easily read. However, the problem lies in the techniques of beak prep. In only a few these increments are easily countable.