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Survey data comes from Northeast Fisheries Science Center's Bottom Trawl Survey. Indices are calculated using the Survdat R package. This data set covers the Albatross IV era of the bottom trawl survey from 1968 to 2008. All appropriate calibration factors have been applied for changes in gear/vessels over the years. Data from the Bigelow era (>2008) are in a separate data set (surveyIndexHB). This data only covers the focal species of the MS Keyrun Project. For an expanded data set see surveyIndexA4All.

Usage

surveyIndexA4

Format

A data frame

See also

Other surveyIndex

YEAR

year survey conducted

SVSPP

Survey Species Code see focalSpecies

SEASON

Season the survey was conducted

variable

stratified biomass or abundance (strat.biomass/strat.abund), variance (biomass.var/abund.var), or standard error (biomass.SE/abund.SE)

value

value of the variable

units

units of the variable

: surveyIndexA4All, surveyIndexAll, surveyIndexHBAll, surveyIndexHB, surveyIndex