Learn how to age a fish.

[lakerman]

https://www.youtube.com/watch?v=HaL7fXZTmIw

[JohnB]

Cool. Going to try this. Thanks for posting.

[Howard Hutchinson]

Very interesting. I would not have guessed correct on either fish. I wonder if this is true of all species. I would imagine?

[JohnB]

I gave this a try on 12" perch (white) and 46cm walleye (clear). I'm getting 6 year for perch and 9 on the walleye. I tried to attach pictures but no go. Will try again later.

[goldscud]

For trout, you use the otolith (inner ear bone).