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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.
- External link to download this item: http://www.worldfishcenter.org/Naga/Naga26-1/pdf/naga_26no1_feature5.pdf
- Sustainable aquaculture 
- Journal Article