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Fishing effort distribution of large beam trawlers in 2011


Metadata
File Identifier: 6A05ABD9-46B5-4A7F-8E8C-87107C31F609
Metadata Language: English
: utf8
Resource Type: Service
Responsible Party:
Individual Name: Rabea Diekmann
Organisation Name: Thünen Instiut
Role: Point Of Contact
Contact Info:
Voice: +49 40 38905 135
Delivery Point: Palmaille 9
City: Hamburg
Administrative Area: Hamburg
Postal Code: 22767
Country: DE
E-Mail Address: rabea.diekmann@ti.bund.de
Metadata Date: 2014-11-27
Metadata Standard Name: INSPIRE Metadata Implementing Rules: Technical Guidelines based on EN ISO 19115 and EN ISO 19119
Metadata Standard Version: V. 1.2
Service Identification
Abstract: International fishing effort distribution in 2011 was calculated for large beam trawlers (>221kW, >24m) in the German EEZ of the North Sea. It was quantified as swept area ratio, which is the ratio between the trawled area over one year and the size of the respective grid cell. Thus, a swept area ratio of 1 means that an area equivalent to the size of the grid cell was fished over one year. The swept area was calculated from data from Vessel monitoring by satellite (VMS) using the approximate width of the first gear of the ship, taken from the European Fleet register. Cell sizes were assigned using the nested grid approach following Gerritsen et al. 2013 (ICES J. Mar. Sci. 70: 523-531), with approximately 3552km² (corresponding to a resolution of 1°x0.5° at 55°N) as the coarsest and approximately 3.5km² as the finest resolution of grid cells, whereas the resolution depends on the amount of information (GPS data from fishing vessels) within a spatial grid.
Purpose: International fishing effort distribution of large beam trawlers in the German EEZ of the North Sea in 2011
Thumbnail:
Browse Graphic: https://coastmap.hzg.de/server/rest/directories/thumbs/Nestedgrid_largeTBB_2011_Clip.jpg
Browse Graphic Type: JPG
Browse Graphic Caption: Fishing effort distribution of large beam trawlers in 2011
Citation:
Title: Fishing effort distribution of large beam trawlers in 2011
Date:
Date: 2014-11-27
Date Type: Creation Date
Identifier: 6A05ABD9-46B5-4A7F-8E8C-87107C31F609-DI
Individual Name: Rabea Diekmann
Organisation Name: Thünen Instiut
Role: Processor
Contact Info:
Voice: +49 40 38905 135
Delivery Point: Palmaille 9
City: Hamburg
Administrative Area: Hamburg
Postal Code: 22767
Country: DE
E-Mail Address: rabea.diekmann@ti.bund.de
Point Of Contact:
Individual Name: Rabea Diekmann
Organisation Name: Thünen Instiut
Role: Processor
Contact Info:
Voice: +49 40 38905 135
Delivery Point: Palmaille 9
City: Hamburg
Administrative Area: Hamburg
Postal Code: 22767
Country: DE
E-Mail Address: rabea.diekmann@ti.bund.de
Keyword Collection:
Keyword: NOAH
Keyword: TI
Keyword: pressureKey5
Keyword: beam trawlers
Keyword: fishing effort
Keyword: Live Data and Maps
Service Type: ESRI ArcGIS Mapping Service
Service type version: 1.1.3
Extent:
West Bounding Longitude: 3
East Bounding Longitude: 9
North Bounding Latitude: 56.5
South Bounding Latitude: 53.5
Constraints: The swept area ratio can only be an approximate value to quantify the impact on the seafloor. First of all, calculations were based on the assumption that all vessels use exclusively their primary gear listed in the Fleet register. Further, gear types are usually further broken down into fishing métiers, specifying gear parameters and target species. Here, we could only distinguish between small and large beam trawlers. Small beam trawler represent to a large degree the coastal shrimp fishery. Effort in offshore areas is probably associated to plaice fishery. Large beam trawlers represent the flatfish fishery, mainly but not exclusively the fishery targeting sole.Because gear designs differ not only in their size, which is considered as gear width, but also in their bottom contact (e.g. by tickler chains), the physical trawling impact is not equivalent to the swept area ratio. Further, the swept area is not equivalent to the proportion of the cell that was impacted by the gear (unless fishing tracks do not overlap at all). The nested grid approach gives swept area ratios for each grid cell, which are however not equivalent in size. Locally the swept area ratio may be even larger when grid cells would be further broken down. However, this can be only done to a resolution of approximately 3.5km² because position data are usually only exact to 0.01°. Further, the VMS system sends position data approximately every 2 hours, and the track of the ship in between cannot be estimated with a high precision.
Legal Constraints:
Access Constraints: Intellectual Property Rights
Use Constraints: Intellectual Property Rights
Distribution
Distribution Format:
Format Name: ArcGIS Service
Format Version: 10.2.1
Transfer Options:
URL: https://coastmap.hzg.de/server/rest/services/NOAH_geoDB/TI_nestedgrid_largeTBB_2011/MapServer
Protocol:
Application Profile:
Function: Information
Transfer Options:
URL: https://coastmap.hzg.de/server/services/NOAH_geoDB/TI_nestedgrid_largeTBB_2011/MapServer/WMSServer?
Protocol:
Application Profile:
Function: Information
Quality
Scope: Dataset
Conformance Result:
Validation Performed: true
Explanation:
Specification:
Title: INSPIRE Directive 2007/2/EC
Date:
Date: 2015-02-05
Date Type: Publication Date
Lineage: Trawlers data and data from Vessel monitoring by satellite (VMS)
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