Dataset

Northeast Fisheries Science Center Bottom Trawl Survey Data

OBIS USA MeasurementOrFact Open in mapper Explore occurrences

This is the Northeast Fisheries Science Center Bottom Trawl Survey database for Northwest Atlantic marine organisms. Survey cruises use a bottom trawl to sample randomly selected stations in an attempt to delineate the species composition, geographic distribution, and abundance of various resources. Fish and selected invertebrate species are identified. Weight, length, total catch numbers, age structures, maturity stages, sex determinations and food content are recorded or collected during the survey cruises but only weight, total catch numbers, and sex determinations are available here. Ichthyoplankton and zooplankton data is available for a subset of the stations. Geographic coverage is from Cape Hatteras to the Gulf of Maine and from the coast to the slope water.

Published: August 25, 2021 at 15:49

URL: https://ipt-obis.gbif.us/resource?r=nefsc_bottom_trawl_surveys_coml

472,036
occurrence records
469,057
measurements and facts
978
taxa
740
species

Taxa

Missing and invalid fields

Field Missing Invalid
coordinateUncertaintyInMeters 472,036
100.0%
decimalLatitude 43
0.0%
decimalLongitude 43
0.0%
individualCount 4,248
0.9%
maximumDepthInMeters 179,889
38.1%
minimumDepthInMeters 179,847
38.1%
occurrenceStatus 4,248
0.9%
scientificNameID 1,161
0.2%

Quality flags

The OBIS data quality flags are documented at https://github.com/iobis/obis-qc.

Flag Dropped Records
NO_DEPTH 179,840
38.1%
DEPTH_EXCEEDS_BATH 4,559
1.0%
MIN_DEPTH_EXCEEDS_MAX 826
0.2%
ON_LAND 267
0.1%
NO_MATCH 116
0.0%
LAT_OUT_OF_RANGE 43
0.0%
LON_OUT_OF_RANGE 43
0.0%
NO_COORD 43
0.0%
WORMS_ANNOTATION_RESOLVABLE 3
0.0%

Measurement types

DNA derived data