NEFSC_FISH_SPECIES_THROUGH_TIME

Name: Northeast Fisheries Science Center "Fish Species Through Time" Trawl Dataset[TG2].
License: The data may be used and redistributed for free but is not intended for legal use, since it may contain inaccuracies. Neither the data Contributor, ERD, NOAA, nor the United States Government, nor any of their employees or contractors, makes any warranty, express or implied, including warranties of merchantability and fitness for a particular purpose, or assumes any legal liability for the accuracy, completeness, or usefulness, of this information.

Grid DAP Data	Sub- set	Table DAP Data	Make A Graph	W M S	Source Data Files	Acces- sible	Title	Sum- mary	FGDC, ISO, Metadata	Back- ground Info	RSS	E mail	Institution	Dataset ID
data			graph			public	Northeast Fisheries Science Center "Fish Species Through Time" Trawl Dataset[TG2].		F I M	background			Rutgers University	NEFSC_FISH_SPECIES_THROUGH_TIME

The Dataset's Variables and Attributes

Row Type	Variable Name	Attribute Name	Data Type	Value
attribute	NC_GLOBAL	cdm_data_type	String	Grid
attribute	NC_GLOBAL	comment	String	The NEFSC trawl survey changed boats and gear in 2009, resulting in potentially different catch rates for some species. Calibration factors have been developed by NEFSC for some species so comparison between pre- and post-2009 datasets is possible, and those calibration factors have been applied in this analysis where applicable, however the calibration factors are imperfect and were not developed for all species. Some species (e.g. Atlantic Herring) were not targeted by the Trawl survey. As a result, the visualization of high biomass areas may be incomplete in these cases.Finally, these layers do not include state-run trawl surveys such as NEAMAP. Therefore, these data only account for the biomass values within the NEFSC trawl survey, and may miss some important areas of high biomass near the coast.
attribute	NC_GLOBAL	Conventions	String	CF-1.6, COARDS, ACDD-1.3
attribute	NC_GLOBAL	Easternmost_Easting	double	-64.99374
attribute	NC_GLOBAL	geospatial_lat_max	double	44.99011
attribute	NC_GLOBAL	geospatial_lat_min	double	33.98944
attribute	NC_GLOBAL	geospatial_lat_resolution	double	0.019785377697841725
attribute	NC_GLOBAL	geospatial_lat_units	String	degrees_north
attribute	NC_GLOBAL	geospatial_lon_max	double	-64.99374
attribute	NC_GLOBAL	geospatial_lon_min	double	-76.39011
attribute	NC_GLOBAL	geospatial_lon_resolution	double	0.01978536458333334
attribute	NC_GLOBAL	geospatial_lon_units	String	degrees_east
attribute	NC_GLOBAL	history	String	Created by Eli Hunter (hunter@marine.rutgers.edu),19-Jun-2020 13:09:19
attribute	NC_GLOBAL	infoUrl	String	https://portal.midatlanticocean.org/data-catalog/
attribute	NC_GLOBAL	institution	String	Rutgers University
attribute	NC_GLOBAL	keywords	String	alewife, Alewife_Fall_biomass, Alewife_Spring_biomass, americanshad, AmericanShad_Fall_biomass, AmericanShad_Spring_biomass, atlanticmackerel, AtlanticMackerel_Fall_biomass, AtlanticMackerel_Spring_biomass, biomass, blackseabass, BlackSeaBass_Fall_biomass, BlackSeaBass_Spring_biomass, bluebackherring, BluebackHerring_Fall_biomass, BluebackHerring_Spring_biomass, bluefish, Bluefish_Fall_biomass, Bluefish_Spring_biomass, butterfish, Butterfish_Fall_biomass, Butterfish_Spring_biomass, center, data, dataset, decade, fall, fish, fisheries, longfinsquid, LongfinSquid_Fall_biomass, LongfinSquid_Spring_biomass, monkfish, Monkfish_Fall_biomass, Monkfish_Spring_biomass, nefsc, nmfs, noaa, norhteast, northeast, northernshortfinsquid, NorthernShortfinSquid_Fall_biomass, NorthernShortfinSquid_Spring_biomass, redhake, RedHake_Fall_biomass, RedHake_Spring_biomass, sandlance, SandLance_Fall_biomass, SandLance_Spring_biomass, science, scup, Scup_Fall_biomass, Scup_Spring_biomass, species, spinydogfish, SpinyDogfish_Fall_biomass, SpinyDogfish_Spring_biomass, spring, threshold, through, time, trawl
attribute	NC_GLOBAL	license	String	The data may be used and redistributed for free but is not intended for legal use, since it may contain inaccuracies. Neither the data Contributor, ERD, NOAA, nor the United States Government, nor any of their employees or contractors, makes any warranty, express or implied, including warranties of merchantability and fitness for a particular purpose, or assumes any legal liability for the accuracy, completeness, or usefulness, of this information.
attribute	NC_GLOBAL	Northernmost_Northing	double	44.99011
attribute	NC_GLOBAL	source	String	https://www.nefsc.noaa.gov/ecosys/spatial-analyses/,Benthic_Habitats.zip
attribute	NC_GLOBAL	sourceUrl	String	(local files)
attribute	NC_GLOBAL	Southernmost_Northing	double	33.98944
attribute	NC_GLOBAL	standard_name_vocabulary	String	CF Standard Name Table v55
attribute	NC_GLOBAL	summary	String	The Fish Species Through Time data represent an analysis of Northeast Fisheries Science Center (NEFSC) bottom trawl survey data collected between 1972 and 2016 (Spring includes an additional year up to 2017). This analysis was performed by The Nature Conservancy with funding from Virginia�s Coastal Zone Management Program. Layers show where selected individual fish species have consistently been found in high biomass over time (by decade). The species included are those that are important recreationally and/or commercially in the Mid-Atlantic region and are also relatively well represented in the trawl survey data. Employing analysis methods developed by NEFSC and Rutgers University, an interpolated biomass surface was derived for each species, each year and each season (refer to the documentation of the fish biomass data layers on the Mid-Atlantic Ocean Data Portal for an overview on the methods used). Each interpolated surface was then analyzed to determine areas of higher relative biomass. Two thresholds were used � �high� and �highest�. These thresholds represent biomass values in the top 25% and top 10%, respectively, of all biomass values available for an individual species and season. The same threshold values are used for all decades, so the resulting layers are comparable. These areas of high biomass by year were then combined by decade (e.g., 1990 � 1999) and areas with high year-to-year variability (areas with 5 years or less within the high or very high categories, or persistence below 50%) were removed. Areas where a species was present, regardless of biomass, were also developed. Finally, data layers were developed showing "overlap areas" for each species. This is a single layer for each species that shows areas of high biomass that occurred in all five decades and spatially overlapped with one another.
attribute	NC_GLOBAL	Title	String	Northeast Fisheries Science Center "Fish Species Through Time" Trawl Dataset[TG2].
attribute	NC_GLOBAL	title	String	Northeast Fisheries Science Center "Fish Species Through Time" Trawl Dataset[TG2].
attribute	NC_GLOBAL	Westernmost_Easting	double	-76.39011
dimension	longitude		float	nValues=577, evenlySpaced=true, averageSpacing=0.01978536458333334
attribute	longitude	_ChunkSizes	uint	577
attribute	longitude	_CoordinateAxisType	String	Lon
attribute	longitude	actual_range	float	-76.39011, -64.99374
attribute	longitude	axis	String	X
attribute	longitude	ioos_category	String	Location
attribute	longitude	long_name	String	Longitude
attribute	longitude	standard_name	String	longitude
attribute	longitude	units	String	degrees_east
dimension	latitude		float	nValues=557, evenlySpaced=true, averageSpacing=0.019785377697841725
attribute	latitude	_ChunkSizes	uint	557
attribute	latitude	_CoordinateAxisType	String	Lat
attribute	latitude	actual_range	float	33.98944, 44.99011
attribute	latitude	axis	String	Y
attribute	latitude	ioos_category	String	Location
attribute	latitude	long_name	String	Latitude
attribute	latitude	standard_name	String	latitude
attribute	latitude	units	String	degrees_north
dimension	decade		float	nValues=5, evenlySpaced=true, averageSpacing=10.0
attribute	decade	actual_range	float	1970.0, 2010.0
attribute	decade	ioos_category	String	Time
attribute	decade	long_name	String	Decade of analysis
attribute	decade	units	String	years
variable	Alewife_Fall_biomass		float	longitude, latitude, decade
attribute	Alewife_Fall_biomass	_FillValue	float	-999999.0
attribute	Alewife_Fall_biomass	ioos_category	String	Unknown
attribute	Alewife_Fall_biomass	long_name	String	Alewife Fall biomass threshold
attribute	Alewife_Fall_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass
variable	Alewife_Spring_biomass		float	longitude, latitude, decade
attribute	Alewife_Spring_biomass	_FillValue	float	-999999.0
attribute	Alewife_Spring_biomass	ioos_category	String	Unknown
attribute	Alewife_Spring_biomass	long_name	String	Alewife Spring biomass threshold
attribute	Alewife_Spring_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass
variable	AmericanShad_Fall_biomass		float	longitude, latitude, decade
attribute	AmericanShad_Fall_biomass	_FillValue	float	-999999.0
attribute	AmericanShad_Fall_biomass	ioos_category	String	Unknown
attribute	AmericanShad_Fall_biomass	long_name	String	AmericanShad Fall biomass threshold
attribute	AmericanShad_Fall_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass
variable	AmericanShad_Spring_biomass		float	longitude, latitude, decade
attribute	AmericanShad_Spring_biomass	_FillValue	float	-999999.0
attribute	AmericanShad_Spring_biomass	ioos_category	String	Unknown
attribute	AmericanShad_Spring_biomass	long_name	String	AmericanShad Spring biomass threshold
attribute	AmericanShad_Spring_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass
variable	AtlanticMackerel_Fall_biomass		float	longitude, latitude, decade
attribute	AtlanticMackerel_Fall_biomass	_FillValue	float	-999999.0
attribute	AtlanticMackerel_Fall_biomass	ioos_category	String	Unknown
attribute	AtlanticMackerel_Fall_biomass	long_name	String	AtlanticMackerel Fall biomass threshold
attribute	AtlanticMackerel_Fall_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass
variable	AtlanticMackerel_Spring_biomass		float	longitude, latitude, decade
attribute	AtlanticMackerel_Spring_biomass	_FillValue	float	-999999.0
attribute	AtlanticMackerel_Spring_biomass	ioos_category	String	Unknown
attribute	AtlanticMackerel_Spring_biomass	long_name	String	AtlanticMackerel Spring biomass threshold
attribute	AtlanticMackerel_Spring_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass
variable	BlackSeaBass_Fall_biomass		float	longitude, latitude, decade
attribute	BlackSeaBass_Fall_biomass	_FillValue	float	-999999.0
attribute	BlackSeaBass_Fall_biomass	ioos_category	String	Unknown
attribute	BlackSeaBass_Fall_biomass	long_name	String	BlackSeaBass Fall biomass threshold
attribute	BlackSeaBass_Fall_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass
variable	BlackSeaBass_Spring_biomass		float	longitude, latitude, decade
attribute	BlackSeaBass_Spring_biomass	_FillValue	float	-999999.0
attribute	BlackSeaBass_Spring_biomass	ioos_category	String	Unknown
attribute	BlackSeaBass_Spring_biomass	long_name	String	BlackSeaBass Spring biomass threshold
attribute	BlackSeaBass_Spring_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass
variable	BluebackHerring_Fall_biomass		float	longitude, latitude, decade
attribute	BluebackHerring_Fall_biomass	_FillValue	float	-999999.0
attribute	BluebackHerring_Fall_biomass	ioos_category	String	Unknown
attribute	BluebackHerring_Fall_biomass	long_name	String	BluebackHerring Fall biomass threshold
attribute	BluebackHerring_Fall_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass
variable	BluebackHerring_Spring_biomass		float	longitude, latitude, decade
attribute	BluebackHerring_Spring_biomass	_FillValue	float	-999999.0
attribute	BluebackHerring_Spring_biomass	ioos_category	String	Unknown
attribute	BluebackHerring_Spring_biomass	long_name	String	BluebackHerring Spring biomass threshold
attribute	BluebackHerring_Spring_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass
variable	Bluefish_Fall_biomass		float	longitude, latitude, decade
attribute	Bluefish_Fall_biomass	_FillValue	float	-999999.0
attribute	Bluefish_Fall_biomass	ioos_category	String	Unknown
attribute	Bluefish_Fall_biomass	long_name	String	Bluefish Fall biomass threshold
attribute	Bluefish_Fall_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass
variable	Bluefish_Spring_biomass		float	longitude, latitude, decade
attribute	Bluefish_Spring_biomass	_FillValue	float	-999999.0
attribute	Bluefish_Spring_biomass	ioos_category	String	Unknown
attribute	Bluefish_Spring_biomass	long_name	String	Bluefish Spring biomass threshold
attribute	Bluefish_Spring_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass
variable	Butterfish_Fall_biomass		float	longitude, latitude, decade
attribute	Butterfish_Fall_biomass	_FillValue	float	-999999.0
attribute	Butterfish_Fall_biomass	ioos_category	String	Unknown
attribute	Butterfish_Fall_biomass	long_name	String	Butterfish Fall biomass threshold
attribute	Butterfish_Fall_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass
variable	Butterfish_Spring_biomass		float	longitude, latitude, decade
attribute	Butterfish_Spring_biomass	_FillValue	float	-999999.0
attribute	Butterfish_Spring_biomass	ioos_category	String	Unknown
attribute	Butterfish_Spring_biomass	long_name	String	Butterfish Spring biomass threshold
attribute	Butterfish_Spring_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass
variable	LongfinSquid_Fall_biomass		float	longitude, latitude, decade
attribute	LongfinSquid_Fall_biomass	_FillValue	float	-999999.0
attribute	LongfinSquid_Fall_biomass	ioos_category	String	Unknown
attribute	LongfinSquid_Fall_biomass	long_name	String	LongfinSquid Fall biomass threshold
attribute	LongfinSquid_Fall_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass
variable	LongfinSquid_Spring_biomass		float	longitude, latitude, decade
attribute	LongfinSquid_Spring_biomass	_FillValue	float	-999999.0
attribute	LongfinSquid_Spring_biomass	ioos_category	String	Unknown
attribute	LongfinSquid_Spring_biomass	long_name	String	LongfinSquid Spring biomass threshold
attribute	LongfinSquid_Spring_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass
variable	Monkfish_Fall_biomass		float	longitude, latitude, decade
attribute	Monkfish_Fall_biomass	_FillValue	float	-999999.0
attribute	Monkfish_Fall_biomass	ioos_category	String	Unknown
attribute	Monkfish_Fall_biomass	long_name	String	Monkfish Fall biomass threshold
attribute	Monkfish_Fall_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass
variable	Monkfish_Spring_biomass		float	longitude, latitude, decade
attribute	Monkfish_Spring_biomass	_FillValue	float	-999999.0
attribute	Monkfish_Spring_biomass	ioos_category	String	Unknown
attribute	Monkfish_Spring_biomass	long_name	String	Monkfish Spring biomass threshold
attribute	Monkfish_Spring_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass
variable	NorthernShortfinSquid_Fall_biomass		float	longitude, latitude, decade
attribute	NorthernShortfinSquid_Fall_biomass	_FillValue	float	-999999.0
attribute	NorthernShortfinSquid_Fall_biomass	ioos_category	String	Unknown
attribute	NorthernShortfinSquid_Fall_biomass	long_name	String	NorthernShortfinSquid Fall biomass threshold
attribute	NorthernShortfinSquid_Fall_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass
variable	NorthernShortfinSquid_Spring_biomass		float	longitude, latitude, decade
attribute	NorthernShortfinSquid_Spring_biomass	_FillValue	float	-999999.0
attribute	NorthernShortfinSquid_Spring_biomass	ioos_category	String	Unknown
attribute	NorthernShortfinSquid_Spring_biomass	long_name	String	NorthernShortfinSquid Spring biomass threshold
attribute	NorthernShortfinSquid_Spring_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass
variable	RedHake_Fall_biomass		float	longitude, latitude, decade
attribute	RedHake_Fall_biomass	_FillValue	float	-999999.0
attribute	RedHake_Fall_biomass	ioos_category	String	Unknown
attribute	RedHake_Fall_biomass	long_name	String	RedHake Fall biomass threshold
attribute	RedHake_Fall_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass
variable	RedHake_Spring_biomass		float	longitude, latitude, decade
attribute	RedHake_Spring_biomass	_FillValue	float	-999999.0
attribute	RedHake_Spring_biomass	ioos_category	String	Unknown
attribute	RedHake_Spring_biomass	long_name	String	RedHake Spring biomass threshold
attribute	RedHake_Spring_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass
variable	SandLance_Fall_biomass		float	longitude, latitude, decade
attribute	SandLance_Fall_biomass	_FillValue	float	-999999.0
attribute	SandLance_Fall_biomass	ioos_category	String	Unknown
attribute	SandLance_Fall_biomass	long_name	String	SandLance Fall biomass threshold
attribute	SandLance_Fall_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass
variable	SandLance_Spring_biomass		float	longitude, latitude, decade
attribute	SandLance_Spring_biomass	_FillValue	float	-999999.0
attribute	SandLance_Spring_biomass	ioos_category	String	Unknown
attribute	SandLance_Spring_biomass	long_name	String	SandLance Spring biomass threshold
attribute	SandLance_Spring_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass
variable	Scup_Fall_biomass		float	longitude, latitude, decade
attribute	Scup_Fall_biomass	_FillValue	float	-999999.0
attribute	Scup_Fall_biomass	ioos_category	String	Unknown
attribute	Scup_Fall_biomass	long_name	String	Scup Fall biomass threshold
attribute	Scup_Fall_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass
variable	Scup_Spring_biomass		float	longitude, latitude, decade
attribute	Scup_Spring_biomass	_FillValue	float	-999999.0
attribute	Scup_Spring_biomass	ioos_category	String	Unknown
attribute	Scup_Spring_biomass	long_name	String	Scup Spring biomass threshold
attribute	Scup_Spring_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass
variable	SpinyDogfish_Fall_biomass		float	longitude, latitude, decade
attribute	SpinyDogfish_Fall_biomass	_FillValue	float	-999999.0
attribute	SpinyDogfish_Fall_biomass	ioos_category	String	Unknown
attribute	SpinyDogfish_Fall_biomass	long_name	String	SpinyDogfish Fall biomass threshold
attribute	SpinyDogfish_Fall_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass
variable	SpinyDogfish_Spring_biomass		float	longitude, latitude, decade
attribute	SpinyDogfish_Spring_biomass	_FillValue	float	-999999.0
attribute	SpinyDogfish_Spring_biomass	ioos_category	String	Unknown
attribute	SpinyDogfish_Spring_biomass	long_name	String	SpinyDogfish Spring biomass threshold
attribute	SpinyDogfish_Spring_biomass	summary	String	1-presence:2-High Biomass:3-Highest Biomass

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.