TropFishR (version 1.6.4)

synLFQ7: Synthetic length-frequency data VII with seasonal oscillation

Description

Synthetic length-frequency data as generated by the function lfqGen from the fishdynr package (Taylor 2016). Can be used by ELEFAN, ELEFAN_SA, or ELEFAN_GA. The data is generated with the following von Bertalanffy growth parameters:

• K = 0.2 +/- 0.1 (CV)

• Linf = 123 +/- 0.05 (CV)

• C = 0.3

• ts = 0

• t_anchor between 0.16 and 0.34 (Time when yearly recruitment pulse occurs; e.g. 0 = Jan 1, 0.25 = Apr 1, 0.5 = Jul 1, 0.75 = Oct 1; repro_wt = c(0, 0, 0.2, 1, 0.6, 0, 0, 0, 0, 0, 0, 0))

Further settings include:

• Lmat = 30.8 (length at maturity)

• L50 = 35 (length at 50% prob. of capture via trawl net)

• wqs = 5 (width between 25% and 75% prob. of capture quantiles; i.e. wqs = 0 is knife-edge selection)

• M = 0.2 (Natural mortality rate)

• harvest_rate = 0.3 (Fishing mortality rate)

Usage

data(synLFQ7)

Format

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).

Examples

data(synLFQ7)

# plot of length frequencies
plot(synLFQ7, Fname = "catch")

# plot of restructured length frequencies
synLFQ7 <- lfqRestructure(synLFQ7, MA = 11)
plot(synLFQ7, Fname = "rcounts")