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| griddap | Subset | tabledap | Make A Graph | wms | files | Accessible | Title | Summary | FGDC | ISO 19115 | Info | Background Info | RSS | Institution | Dataset ID | |
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| https://nybsand.marine.rutgers.edu/erddap/griddap/NEFSC_FISH_SPECIES_THROUGH_TIME | https://nybsand.marine.rutgers.edu/erddap/griddap/NEFSC_FISH_SPECIES_THROUGH_TIME.graph | public | Northeast Fisheries Science Center \"Fish Species Through Time\" Trawl Dataset[TG2]. | 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.\n\ncdm_data_type = Grid\nVARIABLES (all of which use the dimensions [longitude][latitude][decade]):\nAlewife_Fall_biomass (Alewife Fall biomass threshold)\nAlewife_Spring_biomass (Alewife Spring biomass threshold)\nAmericanShad_Fall_biomass (AmericanShad Fall biomass threshold)\nAmericanShad_Spring_biomass (AmericanShad Spring biomass threshold)\nAtlanticMackerel_Fall_biomass (AtlanticMackerel Fall biomass threshold)\nAtlanticMackerel_Spring_biomass (AtlanticMackerel Spring biomass threshold)\nBlackSeaBass_Fall_biomass (BlackSeaBass Fall biomass threshold)\nBlackSeaBass_Spring_biomass (BlackSeaBass Spring biomass threshold)\n... (20 more variables)\n | https://nybsand.marine.rutgers.edu/erddap/metadata/fgdc/xml/NEFSC_FISH_SPECIES_THROUGH_TIME_fgdc.xml | https://nybsand.marine.rutgers.edu/erddap/metadata/iso19115/xml/NEFSC_FISH_SPECIES_THROUGH_TIME_iso19115.xml | https://nybsand.marine.rutgers.edu/erddap/info/NEFSC_FISH_SPECIES_THROUGH_TIME/index.htmlTable | https://portal.midatlanticocean.org/data-catalog/
| https://nybsand.marine.rutgers.edu/erddap/rss/NEFSC_FISH_SPECIES_THROUGH_TIME.rss | https://nybsand.marine.rutgers.edu/erddap/subscriptions/add.html?datasetID=NEFSC_FISH_SPECIES_THROUGH_TIME&showErrors=false&email= | Rutgers University | NEFSC_FISH_SPECIES_THROUGH_TIME |