ArcGIS REST Services Directory Login | Get Token
JSON | SOAP | WMS

GulfDataAtlas/SEAMAP_Fishes_RelativeAbundance_Trawls_1987_2018 (MapServer)

View In:   ArcGIS JavaScript   ArcGIS Online Map Viewer   ArcGIS Earth   ArcMap   ArcGIS Pro

View Footprint In:   ArcGIS Online Map Viewer

Service Description: Relative abundance analysis for Atlantic croaker, gray triggerfish, gulf butterfish, lane snapper, red grouper, red snapper, sand seatrout, silver seatrout, spot and vermilion snapper. Relative abundance is expressed in catch per unit effort (CPUE). CPUE by 10-minute longitude by latitude blocks are summarized from 18,953 40 foot shrimp trawls taken during Southeast Area Monitoring and Assessment Program (SEAMAP) fishery-independent Summer and Fall Shrimp/Groundfish Surveys from 1987 to 2018. CPUE is expressed as the number caught per 1-hour tow. The data presented here are summarized from Southeast Area Monitoring and Assessment Program (SEAMAP) Summer and Fall Shrimp/Groundfish Surveys. The Summer Shrimp/Groundfish Survey started collecting data in 1982 while the Fall Shrimp/Groundfish Survey started collecting data in 1985. The survey design of both surveys was standardized in 1987. Therefore, the data presented here are from 1987 to 2009. Since 1987, the strategy for the trawl surveys has been that day/night sampling sites are chosen randomly in areas stratified by depth and statistical area. Trawl stations sampled by NMFS, Florida, Alabama, Mississippi, and Louisiana are made with a standard SEAMAP 40-ft net, and Texas samples with a 20-ft net. Depth strata consist of 1-fm intervals from 5 to 20 fm, a 2-fm interval from 20 to 22 fm, a 3-fm interval from 22 to 25 fm, 5 fm intervals from 25 to 50 fm and a 10-fm interval from 50 to 60 fm. Trawls are towed perpendicularly to the depth contours and cover the entire depth stratum on each station. Single tows are for a maximum of 55 minutes; for certain stations, a series of consecutive trawl tows is necessary to cover a given depth stratum, with a minimum individual tow across each stratum of 10 minutes and a maximum tow of 55 minutes. The Texas vessels tow 10 minutes parallel to the depth stratum. The survey design was changed in 2009 for NMFS samples and 2010 for all other SEAMAP participants except Texas. With the new survey design, trawls are towed for 30 minutes regardless of whether a depth stratum is covered or not and stations are no longer stratified on whether they are taken during the day or night. Until 2008, Florida did not participate in the trawl surveys and trawl samples were not taken off Florida. In 2008, Florida began participating in the Summer and Fall Shrimp/Groundfish Surveys and NMFS began trawling off Florida. All species of fishes and invertebrates from trawls are identified, enumerated, and weighed. Weights and individual measurements on selected species other than commercial shrimp are also recorded. Total counts from each trawl station are standardized to account for sampling effort and converted to a catch per unit effort (CPUE). CPUE is expressed as the number of fish caught per 1 hour of tow time for a 40 ft trawl. Mean CPUE was then summarized by 10 minute longitude by latitude blocks in which trawling occurred. Since Texas vessels do not strictly adhere to the survey design, data from Texas were not used for this summary.

Map Name: Fishes - Relative Abundance - Fisheries-Independent - Trawls 1987-2018 - Federal

Legend

All Layers and Tables

Dynamic Legend

Dynamic All Layers

Layers: Description: Relative abundance analysis for Atlantic croaker, gray triggerfish, gulf butterfish, lane snapper, red snapper, sand seatrout, silver seatrout, spot and vermilion snapper. Relative abundance is expressed in catch per unit effort (CPUE). CPUE by 10-minute longitude by latitude blocks are summarized from 11,637 40 foot shrimp trawls taken during Southeast Area Monitoring and Assessment Program (SEAMAP) fishery-independent Summer and Fall Shrimp/Groundfish Surveys from 1987 to 2009. CPUE is expressed as the number caught per 1-hour tow.

Copyright Text: David Hanisko, National Marine Fisheries Service

Spatial Reference: 102100  (3857)


Single Fused Map Cache: false

Initial Extent: Full Extent: Units: esriMeters

Supported Image Format Types: PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP

Document Info: Supports Dynamic Layers: true

MaxRecordCount: 1000

MaxImageHeight: 4096

MaxImageWidth: 4096

Supported Query Formats: JSON, geoJSON

Supports Query Data Elements:

Min Scale: 0

Max Scale: 0

Supports Datum Transformation: true



Child Resources:   Info   Dynamic Layer

Supported Operations:   Export Map   Identify   QueryDomains   QueryLegends   Find   Return Updates   Generate KML