Beaked redfish survey stations (example data)

A compact, public example dataset of bottom-trawl survey stations for beaked redfish (Sebastes mentella) in the Barents and Norwegian Seas, used to demonstrate the survey-comparison and prediction-grid functions.

Usage

sebastes

Format

A data frame with 16,699 rows and 12 columns:

cruiseseries

Survey series identifier (the "survey" grouping).

year

Year of the survey (integer).

month

Month of the station (integer).

geartype

Trawl gear type.

lon, lat

Station longitude and latitude (decimal degrees).

X, Y

Projected coordinates (UTM zone 33N, EPSG:32633) in kilometres.

depth

Bottom depth at the station start (m).

swept_area

Swept area (square nautical miles); usable as a log-offset for catch models.

biomass

Catch biomass (kg).

density

Swept-area biomass density (kg per square nautical mile).

Source

Public station data from the ref-index-paper repository (https://github.com/DeepWaterIMR/ref-index-paper), a public subset of the NMDC dataset (https://metadata.nmdc.no/metadata-api/landingpage/a22ab5e19ba4e81b2614170bc45e0e06). Prepared by data-raw/sebastes.R.

Details

It is a subset of the public station data accompanying Vihtakari et al. (2026): beaked redfish only, years 2004-2025, and five surveys with good coverage (EcoS, WinterS, CoastalS, EggaN, EggaS). Coordinates are projected to UTM zone 33N (EPSG:32633) and stored in kilometres, following the sdmTMB convention.

References

Vihtakari, M., Aune, M., Assmann, K. M., Howell, D., Hallfredsson, E. H., and Ward, E. J. (2026). Demersal distribution and fisheries independent trends of beaked and golden redfish in the Barents and Norwegian Seas. ICES Journal of Marine Science, 83(2), fsag009. doi:10.1093/icesjms/fsag009

Examples

data(sebastes)
table(sebastes$cruiseseries)
#> 
#> CoastalS     EcoS    EggaN    EggaS  WinterS 
#>     3986     4465     1933      392     5923