Survdat data pull — survdat

A data pull of bottom trawl survey data from 1983-2024 using the survdat package.

Usage

survdat_subset

Format

A data frame with 16527 rows and 28 variables:

CRUISE6: integer Code uniquely identifying cruise. The first four digits indicate the year and the last two digit uniquely identify the cruise within the year.
STATION: integer Unique sequential order in which stations have been completed.
STRATUM: integer A predefined area where a net dredge, or other piece of gear was deployed. Code consists of 2 parts: Stratum group code number (2 bytes) and stratum number (3 bytes).
SVSPP: integer A standard code which represents a species caught in a trawl or dredge. Refer to the SVDBS.SVSPECIES_LIST
CATCHSEX: integer Code used to identify species that are sexed at the catch level.
LENGTH: integer Measured length of species in centimeters (cm).
TOW: integer Sequential number representing order in which station was selected within a stratum.
SVVESSEL: character Standard two character code for a survey vessel.
YEAR: integer Year in which cruise was conducted.
SEASON: character Season of the year in which cruise was conducted.
LAT: double Beginning latitude of tow in decimal degrees.
LON: double Beginning longitude of tow in decimal degrees.
EST_TOWDATE: character Date and time represented by Eastern Standard Time (EST) for the start of a tow or deployment.
DEPTH: integer A four digit number recording the average depth, to the nearest meter, during a survey gear deployment.
SURFTEMP: double Surface temperature of water (degrees Celsius).
SURFSALIN: double Salinity at water surface in practical salinity units (PSU).
BOTTEMP: double Bottom temperature (degrees Celsius).
BOTSALIN: double Bottom salinity in Practical Salinity Units (PSU).
ABUNDANCE: integer Expanded number of individuals of a species caught at a given station.
BIOMASS: double Expanded catch weight of a species caught at a given station.
NUMLEN: integer Expanded number of specimens at a given length.
INDID: integer A unique identifier for each fish sampled.
INDWT: double Individual weight (KG) of species being sampled.
SEX: integer Code indicating sex of fish or invertebrate species.
MATURITY: character Stage of maturation of the fish being sampled.
AGE: integer Age of specimen in years.
STOM_VOLUME: double Volume of the stomach contents of the fish sampled, measured to the nearest tenth of a cubic centimeter (cc).
STOM_WGT: double Stomach weight of an individual fish in grams.