TropFishR (version 1.6.1)

synLFQ4: Synthetic length-frequency data IV (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 or ELEFAN_SA. The data is generated with the following von Bertalanffy growth parameters:

• K = 0.5

• Linf = 80

• C = 0.75

• ts = 0.5

• t_anchor = 0.25 (Time when yearly recruitment pulse occurs; e.g. 0 = Jan 1, 0.25 = Apr 1, 0.5 = Jul 1st, 0.75 = Oct 1)

Further settings include:

• Linf.cv = 0.05

• K.cv = 0.05

• L50 = 20 (length at 50% prob. of capture via trawl net)

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

• M = 0.5 (Natural mortality rate)

• harvest_rate = 0.5 (Fishing mortality rate)

Usage

data(synLFQ4)

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

# NOT RUN {
data(synLFQ4)

# plot of length frequencies
plot(synLFQ4, Fname = "catch")

# plot of restructured length frequencies
synLFQ4 <- lfqRestructure(synLFQ4, MA = 15)
plot(synLFQ4, Fname = "rcounts")



# }