pj) were
calculated using classic Age-Length Keys built from the
surveys' data. Mean length at age (lmed) was given
values close to the ones observed in the real data, and its
standard deviation (stdv) was calculated as
suggested by Schnute and Fournier (1980).The two catch matrices N1992 and N1993 were
generated from this data, and the F1992 and
F1993 were calculated from them.
The otoliths list contains a total of 1000
length-stratified random samples, extracted from the
N1992 matrix. Each of these samples simulate process
of the sampling of a small subset of fish from the total
catch to analyze its otoliths for age determination. The
age data then obtained can then be used either alone or in
combination with length data to calculate Age-Length Keys
for the population.
The data is presented as a list containing the following items: