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- W2034227769 abstract "We present statistical evidence that estimates of mean length-at-age from a single aggregation of Pacific hake (Merluccius productus) are unlikely to represent those for the entire local population because fish length varies with age and sex, and fish aggregations are probably structured by fish size. We present series of simple linear relationships between estimates of mean length-at-age from hake sample sets and both the proportion of males and the proportions-at-age in those sample sets. To determine these relationships, we developed a likelihood-based model which incorporated model and sampling uncertainty in estimates of mean lengths-at-age, and sampling uncertainty in the estimated proportions of males or proportions-at-age. The results show that if fish length varies with sex or age, then the mean lengths-at-age estimated from a single sample set will be predictably, although perhaps modestly, influenced by the age and sex composition of the sample set. Thus, estimates of population mean lengths-at-age, and other sex–age–size statistics of fish that form aggregations, should be based on the premise that an aggregation of fish, not an individual fish, is the basic sampling unit." @default.
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- W2034227769 date "1992-08-01" @default.
- W2034227769 modified "2023-09-23" @default.
- W2034227769 title "Use of a Binomial–Normal Functional Model to Demonstrate that the Sex and Age Composition of Pacific Hake (Merluccius productus) Aggregations Affects Estimates of Mean Lengths-at-Age" @default.
- W2034227769 cites W2004611760 @default.
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- W2034227769 doi "https://doi.org/10.1139/f92-185" @default.
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