Name: Al Ghazal Fishing Gear Distribution

Display Field: created_user

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: The spatial distribution of Al Ghazal fishing gear used in Abu Dhabi Emirate. Al Ghazal is an encircling gill net used to catch large pelagic fish. On moonless night, fishermen actively scout the sea water surface on bioluminescence manifestations which indicates the presence of pelagic fish schools. Once encountered, fishermen set out the net in an L-shaped manner and the warp line is towed to close the net around the school of fish. The net hangs vertical as a wall but does not necessarily touch the sea bottom. Going inside the enclosure the fishermen make a lot of noise to chase the fish into the net. Al Ghazal is regulated and only tarad fishermen operate this fishing gear from October to April. Data originates from Abu Dhabi commercial fisheries statistics stored in the National Fisheries Information System (NFIS), 2010-2012. Enumerators interview fishermen on their fishing trip whereabouts, utilizing a marine grid with spatial units measuring approx. 18 by 18 km. This allowed to pinpoint the actual fishing grounds for the Al Ghazal fishing gear more accurately. The resulting spatial distribution polygon was inferred by Inverse Distance Weighting tool (IDW), classified to eight Jenks natural break classes, excluding fishing intensity values below 0.05. The total sample size was 2,238 records obtained from Delma, Al Sadar, Al Marfa, Free Port, Saadiyat and Al Bateen landing sites. The polygon output is generated from a Raster file created using Spatial Interpolation as follows: 1. Transformation of the float raster (ghazal_id1) into an integer raster (ghazal_int) with the Raster Calculator tool and Formula is Int(“ghazal_id1*1000+0.5). 2. Convert ghazal_int raster into polygon ghzl_plgn with Raster to Polygon tool. 3. In Editor, delete records with attributes “GRIDCODE” <= 50 to give the polygon the same outline as in ghazal_id1. 4. In Editor, merge all features into one single polygon and save as ghzl_plgn shape file.

Service Item Id: 97b9591dee1648ba859c6640a5a61a74

Copyright Text: Created by: Fisheries Investigations & Monitoring Unit as an output of the Fish Landings & Population Dynamics Project in 2013. Documentation: Abu Dhabi fishing methods and species distribution maps. Data Origin: Environment Agency-Abu Dhabi.

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Supported Query Formats: JSON, geoJSON, PBF

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Extent:

XMin: 51.65121547600006
YMin: 24.038192781000078
XMax: 54.89002218600007
YMax: 25.436706984000068
Spatial Reference: 4326  (4326)  LatestVCSWkid(0)

Drawing Info:

Renderer:
Simple Renderer:
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Color: [201, 242, 208, 255]
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Color: [130, 130, 130, 255]
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Transparency: 0
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Advanced Query Capabilities:

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Supports Sql Expression: true
Supports Query With ResultType: false
Supports Returning Geometry Centroid: false
Supports Binning LOD: false
Supports Query With LOD Spatial Reference: false
Supports Percentile Statistics: true
Supports Having Clause: true
Supports Count Distinct: true
Supports Time Relation: true
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Supports Query Analytic: true
Supports Query With Current User: true

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Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Type ID Field: null

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• ID ( type: esriFieldTypeDouble, alias: ID )
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Supported Operations:   Query   Query Attachments   Query Analytic   Generate Renderer   Return Updates

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