The menhaden
data frame has 15 rows and 4 columns.
Age, fecundity-at-age, partial recruitment, fraction mature, and nautral mortality data for menhaden
to calculate eggs-per-recruit.
menhaden
This data frame contains the following columns:
vector of ages
vector of weights at spawning for each age
partial recruitment vector
vector of fraction of females mature at age
vector of natural mortality value-at-age