Maybe ChatGPT does.

I used something like this, in which Total_mort = P/B

library(FSA)

library(dplyr)

Data %>%

filter(Age > 0, !is.na(Length)) %>%

group_by(Species) %>%

mutate(Linf_fixed = quantile(Length)[4]) %>%

summarise(Linf = (f.starts

Thank you!

Tobias Büring already stated that Z ~ (P/B) (Allen, 1971). Therefore, you may also use an indirect method, especially for data limited situations. It is the empirical formulation by Hoenig (1983) for teleost fishes:

ln(Z) = 1.46 - 1.01 * ln(tmax)

where tmax is the maximum observed age for the species.