Description Usage Format Source Examples
Length-frequency data of the clam Abra alba as presented
by Brey et al. (1988). Includes 7 approximately bi-monthly samplings of
A. alba binned into 14 length classes. The data is of class "lfq", which
can be used used e.g. in functions estimating growth parameters:
ELEFAN
, ELEFAN_SA
or
ELEFAN_GA
.
1 |
A list of class lfq consisting of:
dates dates of sampling times (class Date),
midLengths midpoints of the length classes,
catch matrix with catches/counts per length class (row) and sampling date (column).
Brey, T., Soriano, M., and Pauly, D. 1988. Electronic length frequency analysis: a revised and expanded user's guide to ELEFAN 0, 1 and 2. ICLARM Contrib. 261.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | data(alba)
# plot raw catch frequencies
plot(alba, Fname = "catch")
# plot restructured frequencies
alba <- lfqRestructure(alba, MA=5)
plot(alba, Fname = "rcounts")
# ELEFAN_SA fitting
set.seed(1)
fitSA <- ELEFAN_SA(
alba, seasonalised = TRUE,
init_par = list(Linf=14.5, K=1.1, t_anchor=0.4, ts=0, C=0.2),
low_par = list(Linf=13, K=0.7, t_anchor=0, ts=0, C=0),
up_par = list(Linf=15.5, K=1.5, t_anchor=1, ts=1, C=1),
SA_time = 60
)
unlist(fitSA$par)
fitSA$Rn_max
# plot ELEFAN_SA results
plot(alba, Fname = "catch", draw = FALSE)
lfqFitCurves(fitSA, col=2, par=fitSA$par, draw=TRUE)$Rn_max
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