An approach to estimate the natural mortality rate in fish stocks
A simple approach is introduced to estimate the natural mortality rate (M) of fish stocks. The approach is based on the age at maximum cohort biomass, or critical length (L*) concept. The ratio of the critical length to the asymptotic length ( = L*/L8) is relatively constant in 141 fish stocks at 0.62 (CV = 21.4 per cent) and the relationship M = 3K(1- )/ is derived and could be used to estimate M, where K is the growth coefficient of the von Bertalanffy growth function. Average values of are given for the various Families of fish in order to estimate M based on closely related species.
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| Main Author: | |
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| Format: | article biblioteca |
| Language: | English |
| Published: |
2003
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| Subjects: | Fisheries, Mortality, Stocks, Life history, Marine fish, |
| Online Access: | http://hdl.handle.net/1834/25752 |
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