GrowthData3: Hypothetical growth data for testing

In FSA: Simple Fisheries Stock Assessment Methods

Hypothetical growth data for testing

Description

Hypothetical lengths at time of marking/tagging and recapture and time-at-large (i.e., between marking and recapture). These data are useful for testing growth related functions (e.g., findGrowthStarts) as they were generated from known growth functions (e.g., von Bertalanffy) with some random error and are, thus, “as good as it gets” for testing.

Format

A data frame of 128 observations on the following 5 variables:

tag

A unique fish ID (i.e., tag) number

tlM

Total length at time of marking/tagging simulated from a von Bertalanffy growth function with Linf=450, K=0.3, and t0=-0.5

tlR

Total length at time of recapture simulated from a von Bertalanffy growth function with Linf=450, gi=0.3, and ti=3 and assuming a random time-at-large from marking/tagging of roughly 1, 2, or 3 years.

deltat

Time-at-large (i.e., time between marking/tagging and recapture) simulate to be 1, 2, or 3 years (with decreasing probability) and some random error of a few days.

deltaL

Change in length between the time or marking/tagging and recapture (i.e., tlR-tlM).

Topic(s)

• Growth

• von Bertalanffy

See Also

GrowthData1, GrowthData2, and findGrowthStarts

Examples

str(GrowthData3)
head(GrowthData3)
plot(tlR~tlM,data=GrowthData3)
abline(a=0,b=1,col="red")

FSA documentation built on June 8, 2025, 11:56 a.m.