In some fisheries, catch-age information is unavailable or unreliable, yet catch-length information is obtained readily. For such cases, length-based models may be appropriate. These models typically combine a growth model with a statistical distribution to estimate transition probabilities from one length category to another. Under deterministic growth, length- and age-based models are equivalent in the sense that one is deducible from the other. Dimensionality of mortality rates may differ, however, with age-based rates in per unit time and length-based rates in per unit length.
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