MQMF (version 0.1.0)

abdat: abdat A list of fishery data for blacklip abalone

Description

A dataset of fishery data for blacklip abalone (Haliotis rubra) from part of the Tasmanian west coast for the years 1985 - 2008. It contains a data.frame containing the year, the catch, and the standardized CPUE from four statistical blocks of Tasmania's west coast combined. In particular, it can be used when fitting a surplus production model. Workable initial parameter values, before log-transformation might be: r= 0.4, K=9400, Binit=3400, sigma=0.05 for the Schaefer version, while these also work for the Fox model one could use r=0.3, K=12000, Binit=4000, sigma=0.05.

Format

A data.frame of three columns

year

the annual year in which the catches occurred

catch

the reported landed catch in tonnes, to the nearest kilogram

cpue

the standardized catch-per-unit-effort for this dive fishery

Subjects

• Surplus Production Modelling, Schaefer and Fox models

• Model fitting using maximum likelihood

• Uncertainty examples

Examples

# NOT RUN {
 data(abdat)
 print(abdat)
 oldpar <- par(no.readonly=TRUE)
 plot(abdat$year,abdat$cpue, type="l",xlab="year",ylab="CPUE",
      panel.first=grid())
 points(abdat$year,abdat$cpue,pch=16,cex=1.2)
 par(oldpar)
# }