Conversion of Mortality Rates
Convert instantaneous fishing mortality rate (F) to annual exploitation rate (mu) and vice versa for Type I and II fisheries.
convmort(value = NULL, fromto = 1, type = 2, M = NULL)
value |
mortality rate |
fromto |
conversion direction: 1=from F to mu; 2 = from mu to F. Default is 1. |
type |
type of fishery following Ricker (1975): 1=Type I; 2=Type II. Default is 2. |
M |
natural mortality rate (for Type II fishery) |
Equations 1.6 and 1.11 of Ricker (1975) are used.
A vector of the same length as value containing the converted values.
Gary A. Nelson, Massachusetts Division of Marine Fisheries gary.nelson@mass.gov
Ricker, W. E. 1975. Computation and interpretation of biological statistics of fish populations. Bull. Fish. Res. Board. Can. 191: 382 p.
convmort(0.3,fromto=1,type=2,M=0.15)
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