The challenge “Fishery Impacts” aims to construct the fishery data sets and information that will serve to quality assess, extract the synergies between and identify the gaps of the present datasets on fisheries in terms of landings, discard and bycatch as well as in terms of spatial distribution of the bottom trawl fishing effort in order to evaluate changes inlevel of disturbance on the sea floor.



The workflow is made of three major activities:

Activity 1: to search for upstream data to meet challenge requirements

Different sources are pointed out to identify and collate the various data sets:

  1. Vessel monitoring system (VMS), logbook data of the Member States (where available);
  2. Automatic Identification System (AIS) data (where available);
  3. Scientific publications, grey literature and data sets from studies on the spatial distribution of the trawler fishing effort carried out before and after the DCR and supported by EC or Member States.
    4. Search via reference catalogue (e.g. Emodnet, etc..)

Activity 2: to build and analyze data base, produce challenge outputs for GIS use

Activity 3: to deliver checkpoint information, and report assessment in results in the Literature Survey and Data Adequacy Reports. .



Team involved  


Data processing

  • Which input information is looked for, discoverable 

To fulfill the objective an investigation on the availability of VMS data before 2009 will be carried out. In the case raw VMS data of trawlers will be obtained from the Member States for all vessels cruising in the Black Sea waters, VMS data points will be filtered in fishing points from the non-fishing points considering as first criterion the vessel speed profile.

From 2009 the indicators 5-Distribution of fishing activities, 6-Aggregation of fishing activities and 7- Areas not impacted by mobile bottom gears of the Appendix XIII of the Commission Decisions 2008/949/EC and 2010/93/EU, all based on VMS data, will be requested and utilized.

The Vessel Monitoring by satellite System (VMS) is a powerful tool in fishery management, since it allows for high resolution analyses of fishing activity and quantitative evaluations of fishing effort at both spatial and temporal scale. Given that the main VMS limit is represented by the temporal resolution (generally 2 h) of signals, a series of approach can be developed to interpolate vessels positions.

The newest and most powerful method in this framework is based on AIS data or GPS data loggers. The comparison between AIS and GPS loggers with VMS data will be carried out both analyzing the error affecting VMS interpolation of single tracks and converting the interpolated tracks into gridded data to be used for computation of ecological indicators of fishing pressure.

Browse Data Source

  • Are data sets accessible ?

The Challenge will provide information on the data availability in a standardized way plus terms of access and use.

  • How appropriate for use are the data ?

The Challenge will provide information on the data appropriateness in standardized way plus descriptive text of strengths and weakness regarding the appropriateness of upstream data used. It will include a rationale for non selection of unused input data.


Targeted products

The final products will be a set of data, points, gridded or polygons, that will be represented on maps showing the extent of the trawling fishing areas in order to identify the areas more disturbed by bottom trawling (number of disturbances per month), change in level of disturbance over the past ten years and damage to sea floor to both living and non-living components plus quality assessments indicators and reports.