Journal article
Size-based theory for fisheries advice
Fisheries science and management is founded upon the Beverton-Holt theory of fish stock demography. The theory uses age as the structuring variable, however, there are several reasons to use body size as the structuring variable: most processes that affect a fish are determined by its body size rather than its age: consumption, mortality, maturation, fecundity, fish gear selectivity, etc.., and measurements of body size are easy, accurate, and abundant.
Here I review size-based theory of a fish stock and compare it to classic age-based theory. I show that size- and age-based demography are equivalent representations of demography. However, size-based theory is axiomatic, which leads to a deeper theory with two advantages: predictions need fewer parameters than age-based theory and the theory connects directly to life-history traits.
The connection with traits makes size-based theory particularly useful for data-poor application and facilitates evolutionary calculations. I compare age- and size-based theory for fisheries impact and stock assessments, and provide a perspective on the challenges and future of single-stock theory.
Language: | English |
---|---|
Publisher: | Oxford University Press |
Year: | 2020 |
Pages: | 2445-2455 |
ISSN: | 10959289 and 10543139 |
Types: | Journal article |
DOI: | 10.1093/icesjms/fsaa157 |
ORCIDs: | Andersen, K. H. |