Apart from fish, of which animal’s age can be calculated form the number of rings?
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Answer: aging a tree by counting the number of growth rings. However, the age of the fish is determined by counting the number of wide growth rings called annuli. In our example, the bluegill is 4 years old. You can also use the projected image to calculate the size of a fish during each year of its life
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The age of a fish is determined by counting the number of annuli or year marks. In some cycloid scales, such as those on trout, there may be no clear seasonal difference in spacing between circuli.
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