^^^ I agree with Bill on the age vs size thing. I caught a 13" YP from my pond last year in early Spring. Looked kinda plump, thought it was a female. Nope. it turned out to be a male when I cleaned it.
There were people from SDSU at one of the PB conferences doing otolith removal and aging. They sure made it look easy and quick. Zip out it came, they cracked it in half and looked at it under the microscope.
