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GulfDataAtlas/SEAMAP_Fishes_RelativeAbundance_FallPlankton (MapServer)

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Service Description: Since 1982, Southeast Area Monitoring and Assessment Program (SEAMAP) plankton surveys have been conducted by the National Marine Fisheries Service in cooperation with the states of Florida, Alabama, Mississippi, and Louisiana. The SEAMAP Spring Plankton Survey began in 1982 while the SEAMAP Fall Plankton Survey began in 1985. A SEAMAP Winter Plankton Survey took place in 1983, 1984, 1993, 1996, 2004, 2008, 2009, and 2011. Plankton sampling is carried out during these surveys at predetermined SEAMAP stations arranged in a fixed, systematic grid pattern across the entire Gulf of Mexico. Most but not all SEAMAP stations (designated by a unique SEAMAP number) are located at ~56 km or 0.5-degree intervals along this grid. Some SEAMAP stations are located at less than 56 km intervals especially along the continental shelf edge, while others have been moved to avoid obstructions, navigational hazards, or shallow water. Most SEAMAP plankton samples are taken during either dedicated plankton or shrimp/groundfish surveys, but over the years additional samples were taken using SEAMAP gear and collection methods at locations other than designated SEAMAP stations and/or outside established SEAMAP surveys, e.g. during Louisiana seasonal trawl surveys, SEAMAP Squid/Butterfish survey; and other serendipitous or special projects. Although other plankton sampling gear types and mesh sizes have been used throughout the SEAMAP time series, the standard sampling gear and methodology used to collect plankton samples during SEAMAP surveys are bongo and/or neuston nets. A 61 cm (outside diameter) bongo net fitted with 0.335 mm mesh netting is fished in an oblique tow path from a maximum depth of 200 m or to 2-5 m off the bottom at station depths less than 200 m. A single or double, 2x1 m pipe frame neuston net fitted with 0.950 mm mesh netting is the other standard gear employed and it is towed at the surface with the frame half-submerged for 10 minutes. Maximum bongo tow depth is calculated using the amount of wire paid out and the wire angle at the ‘targeted’ maximum tow depth, or observed and recorded in real time throughout the tow. A mechanical flowmeter is mounted off-center in the mouth of each bongo net to record the volume of water filtered. During surveys in the early part of the time series a flowmeter was placed in only one side of the bongo gear. Water volume filtered during bongo net tows ranges from ~20 to 600 m3 but is typically 30 to 40 m3 at the shallowest stations and 300 to 400 m3 at the deepest stations. This map presents the relative abundance (number per hour) of larval king mackerel, red snapper, spanish mackerel, and vermilion snapper by 30-minute longitude by latitude blocks. Data are from 2,342 bongo net samples taken from 1986 to 2006 as part of plankton sampling associated with the Southeast Area Monitoring and Assessment Program (SEAMAP) Fall Plankton Survey. Abundance is the number of fish larvae per 10 m2 of sea surface within each 0.5 degree longitude by latitude block. Data are limited to samples collected with 61 cm bongo nets fitted with 0.333 mm mesh nets.

Map Name: Fishes - Relative Abundance - Fisheries-Independent - Fall Plankton Surveys - Federal

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Layers: Description: Relative abundance (number per hour) of larval king mackerel, red snapper, spanish mackerel, and vermilion snapper by 30-minute longitude by latitude blocks. Data are from 2,342 bongo net samples taken from 1986 to 2006 as part of plankton sampling associated with the Southeast Area Monitoring and Assessment Program (SEAMAP) Fall Plankton Survey. Abundance is the number of fish larvae per 10 m2 of sea surface within each 0.5 degree longitude by latitude block. Data are limited to samples collected with 61 cm bongo nets fitted with 0.333 mm mesh nets.

Copyright Text: David Hanisko, National Marine Fisheries Service; Jeff Rester, Gulf States Marine Fisheries Commission

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

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Min Scale: 0

Max Scale: 0

Supports Datum Transformation: true



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