Unlike most mammals, birds, and insects, fish often continue to grow after they reach sexual maturity. Although growth typically slows down just before sexual maturation as resources are channeled to gonads and reproduction, it can still continue for quite some time after maturation. This is called indeterminate growth, in contrast to determinate growth where any increase in body size ceases after maturation. In order for a model to describe growth in fish, it should therefore permit growth to be indeterminate, and it should model growth during the entire life span of the fish, not only during the juvenile and immature phases.
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