PBSmodelling (version 2.68.8)

CCA.qbr: Data: Sampled Counts of Quillback Rockfish (Sebastes maliger)

Description

Count of sampled fish-at-age for quillback rockfish (Sebastes maliger) in Johnstone Strait, British Columbia, from 1984 to 2004.

Usage

data(CCA.qbr)

Format

A matrix with 70 rows (ages) and 14 columns (years). Attributes “syrs” and “cyrs” specify years of survey and commercial data, respectively.

[,c(3:5,9,13,14)]	Counts-at-age from research survey samples
[,c(1,2,6:8,10:12)]	Counts-at-age from commercial fishery samples

All elements represent sampled counts-at-age in year. Zero-value entries indicate no observations.

Details

Handline surveys for rockfish have been conducted in Johnstone Strait (British Columbia) and adjacent waterways (126\(^\circ\)37'W to 126\(^\circ\)53'W, 50\(^\circ\)32'N to 50\(^\circ\)39'N) since 1986. Yamanaka and Richards (1993) describe surveys conducted in 1986, 1987, 1988, and 1992. In 2001, the Rockfish Selective Fishery Study (Berry 2001) targeted quillback rockfish Sebastes maliger for experiments on improving survival after capture by hook and line gear. The resulting data subsequently have been incorporated into the survey data series. The most recent survey in 2004 essentially repeated the 1992 survey design. Fish samples from surveys have been supplemented by commercial handline fishery samples taken from a larger region (126\(^\circ\)35'W to 127\(^\circ\)39'W, 50\(^\circ\)32'N to 50\(^\circ\)59'N) in the years 1984-1985, 1989-1991, 1993, 1996, and 2000 (Schnute and Haigh 2007).

References

Berry, M.D. (2001) Area 12 (Inside) Rockfish Selective Fishery Study. Science Council of British Columbia, Project Number FS00-05.

Schnute, J.T. and Haigh, R. (2007) Compositional analysis of catch curve data with an application to Sebastes maliger. ICES Journal of Marine Science 64, 218--233.

Yamanaka, K.L. and Richards, L.J. (1993) 1992 Research catch and effort data on nearshore reef-fishes in British Columbia Statistical Area 12. Canadian Manuscript Report of Fisheries and Aquatic Sciences 2184, 77 pp.

Examples

local(envir=.PBSmodEnv,expr={
  oldpar = par(no.readonly=TRUE)
  # Plot age proportions (blue bubbles = survey data, red = commercial)
  data(CCA.qbr,envir=.PBSmodEnv); clrs=c("cornflowerblue","orangered")
  z <- CCA.qbr; cyr <- attributes(z)$cyrs;
  z <- apply(z,2,function(x){x/sum(x)}); z[,cyr] <- -z[,cyr];
  x <- as.numeric(dimnames(z)[[2]]); xlim <- range(x) + c(-.5,.5);
  y <- as.numeric(dimnames(z)[[1]]); ylim <- range(y) + c(-1,1);
  expandGraph(mgp=c(2,.5,0),las=1)
  plotBubbles(z,xval=x,yval=y,powr=.5,size=0.15,clrs=clrs,
    xlim=xlim,ylim=ylim,xlab="Year",ylab="Age",cex.lab=1.5)
  addLegend(.5,1,bty="n",pch=1,cex=1.2,col=clrs,
    legend=c("Survey","Commercial"),horiz=TRUE,xjust=.5)
  par(oldpar)
})

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