- Title
- Pair pelagic trawl fishery - 2013
- Abstract
Fishing effort (hours of activity) of Pair Pelagic Trawlers targeting small-pelagics has been assessed using Vessel Monitoring System (VMS), that is a collection system of fishing activity data in space and time. Each fishing vessel is equipped with a blue box that periodically sends signals (pings) containing data about position, speed and course of the vessel. Each signal sent by the blue box is a VMS ping.
Values are divided in 5 classes:
5: very low; minimum value in 2013 for Adriatic area
4: low
3: medium
2: high
1: very high: maximun value in 2013 for Adriatic area- Publication Date
- June 3, 2015, 3:07 p.m.
- Type
- Vector Data
- Category
- Fisheries and Aquaculture
- Fisheries and Aquaculture
- Owner
- CNR-ISMAR
- Maintenance Frequency
- Frequency Of Maintenance For The Data Is Not Known
- Restrictions
- This layer can't be used for any purposes without the written permission of the owner.
- Purpose
The purpose of this map is to assess the distribution of fishing effort using satellite (VMS) data, which can provide exhaustive analysis of fishing effort for fishing fleet activities in space and time.
- Language
- English
- Data Quality
Map of the Italian fleet has been created using VMSbase (Russo et al., 2014), an R package devised to manage, process and visualize information about fishing vessels activity (provided by the vessel monitoring system - VMS). VMSbase is primarily conceived to be user-friendly; to this end, a suite of state-of-the-art analyses is accessible via a graphical interface. In addition, the package uses a database platform allowing large datasets to be stored, managed and processed very efficiently. Methodologies include data cleaning, that is removal of redundant or evidently erroneous records, and data enhancing, that is interpolation and merging with external data sources.
The original fishing values effort (hours of activity) was converted in values between 1 (minimun value in 2013) to 100 (maximum value in 2013).
- Supplemental Information
A definition of pair pelagic fishery can be found here:
http://en.wikipedia.org/wiki/Pair_trawling
http://en.wikipedia.org/wiki/Midwater_trawling- Spatial Representation Type
- vector data is used to represent geographic data
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