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Baldwin - that is why it is referred to as a 4+ fish. The estimate of 4.5 is not a bad guess if the fish is 4 years old. The annuli do get laid down at different rates - during the warmer water months with the feedbag thrown on then they can grow more quickly. Colder water and reduced growth - and I believe even the diversion of resources to the production of eggs can lead to the annuli being put down closer together.
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