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2nd Answer:

It is almost impossible to determine a fish's age. There is no one thing to look at.

1st Answer:

Fish scales... rings just like on a tree

3rd Answer:

If you can get a book that tells you the different lengths of the fish the longest length will be the older fish. And if a fish is really old it will begin to develop cataracts

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14y ago

What else can I help you with?