blackisland {MQMF}

blackisland tagging data from a blacklip abalone population

Description

A 108 x 4 data.frame containing dt, the time in years between tagging and recapture, l1 the shell length at tagging, and l2, the length at recapture, with the growth increment, dl as the last column. This data can be used to estimate the growth characteristics of abalone from the Black Island site, which is on the south west coast of Tasmania, Australia. The mean time interval between tagging and recapture is 1 year and 1 week, 1.02 years, which reflects the practical problems of taking a vessel around the bottom of Tasmania, where it is essential to wait on suitable weather for such sub-tidal field work.

Format

A data.frame of four columns

dt

the time between tagging and recapture, in years

l1

the shell length when tagged in mm

l2

the shell length at recapture in mm

dl

the growth increment between tagging and recapture in mm; there are zero values.

Subjects

• Tagging data

• Estimation of individual growth

• Binomial likelihoods

• Faben's version of the von Bertalanffy curve

Source

Thanks to Dr Craig Mundy and the abalone team at the Institute of Marine and Antarctic Studies, of the University of Tasmania for the use of this data.

Examples

 data(blackisland)
 print(head(blackisland,20))
 oldpar <- par(no.readonly=TRUE)
 plot(blackisland$l1,blackisland$dl,type="p",pch=16,
 xlab="Initial Length mm",ylab="Growth Increment mm",
 panel.first=grid())
 abline(h=0)
 par(oldpar)