x.ling {scape}

Ling Assessment

Description

Stock assessment data and model fit for ling (Genypterus blacodes) in New Zealand waters, using a Coleraine statistical catch-at-age model.

This is a two-sex model with 30 age classes and 29 length classes, the catch data starting in 1973 and ending in 2000. The model was fitted to five data components: longline abundance index, survey abundance index, survey catch at age, longline catch at length, and trawl catch at length.

Usage

x.ling

Format

List of class scape containing:

N	predicted numbers at age
B	predicted biomass, recruitment, and observed landings (year things)
Sel	predicted selectivity and observed maturity (age things)
Dev	predicted recruitment deviates from the stock-recruitment curve
CPUE	commercial abundance index and fit
Survey	survey abundance index and fit
CAs	survey C@A (catch at age) and fit
CLc	commercial C@L (catch at length) and fit

Details

Hilborn et al. (2003) give a general description of the Coleraine generalized model.

Estimated parameters: R0, Rinit, Sleft[trawl], Sfemale[t], Smale[t], Sright[t], Sleft[longline], Sfemale[l], Smale[l], Sright[l], Sleft[survey], Sfemale[s], Smale[s], Sright[s], q[l], q[s], and 29 recruitment deviates.

Note

The list was imported from the file ‘scape/example/ling.res’ using importCol.

The functions ll (package gdata) and head are recommended for browsing nested objects, e.g. ll(x.ling), ll(x.ling$N), and head(x.ling$N).

Source

Annala, J. H., Sullivan, K. J., O'Brien, C. J. and Smith, N. W. M., eds. (2001) Report from the Fishery Assessment Plenary: Stock assessments and yield estimates. NIWA, Wellington.

Magnusson, A. (2001) SeaFIC assessment of Chatham Rise ling (LIN 3 and 4). Middle Depths Working Group Doc. 11. Report for the New Zealand Ministry of Fisheries.

References

Hilborn, R., Maunder, M., Parma, A., Ernst, B., Payne, J. and Starr, P. (2003) Coleraine: A generalized age-structured stock assessment model. User's manual version 2.0. University of Washington Report SAFS-UW-0116.

See Also

importCol was used to import the fitted model.

x.cod, x.ling, x.oreo, x.saithe, and x.sbw are fitted scape models to explore.

scape-package gives an overview of the package.

Examples

plotB(x.ling)
plotCA(x.ling, "s")
plotCL(x.ling, "c", series="1")
plotCL(x.ling, "c", series="2")
plotIndex(x.ling, "c")
plotIndex(x.ling, "s")
plotN(x.ling)
plotSel(x.ling)