synLFQ6: Synthetic length-frequency data VI (without seasonal...

In TropFishR: Tropical Fisheries Analysis

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 = 0.47 +/- 0.2 (CV)

• Linf = 33.7 +/- 0.05 (CV)

• C = 0

• ts = 0

• 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:

• L50 = 10 (length at 50% prob. of capture via trawl net)

• wqs = 3 (width between 25% and 75% prob. of capture quantiles; i.e. wqs = 0 is knife-edge selection)

• M = 0.8 (Natural mortality rate)

• harvest_rate = 1.3 (Fishing mortality rate)

Usage

data(synLFQ6)

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).

Source

Taylor, M (2016). fishdynr: Fisheries science related population dynamics models. R package version 0.2. https://github.com/marchtaylor/fishdynr

Examples

data(synLFQ6)

# plot of length frequencies
plot(synLFQ6, Fname = "catch")

# plot of restructured length frequencies
synLFQ6 <- lfqRestructure(synLFQ6, MA = 7)
plot(synLFQ6, Fname = "rcounts")

TropFishR documentation built on Oct. 4, 2021, 9:06 a.m.