Mar.fleets : an R package for integrating commercial catch and at-sea observer data from Maritimes region / by Mike McMahon and Heather Bowlby.: Fs97-6/3450E-PDF

"For Maritimes Commercial Fisheries, information on non-retained catch (i.e. observer data) is stored in a separate database from retained catch information (i.e. commercial landings). While the observer database includes sufficient information to identify vessels, it does not include the suite of licencing information used to associate vessels with fleets. Further, neither database includes a mechanism for reliably associating the recorded trips and sets in one with those recorded in the other. Maritimes staff frequently need to identify all of the participants in a fishery, and extract fleet-specific data associated with the commercial landings as well as any observed catch. To better understand the wider impact of a given fishery on non-retained species, it is often imperative to know which commercial trips are associated with which observed trips to correctly prorate catch data. This report describes Mar.fleets, a new R package offering Maritimes users a unified approach for reliably: 1) identifying fleets, 2) extracting commercial landings, 3) matching commercial and observed trips and sets, and 4) extracting the matched observer data. Each of the underlying functions are described, as are the mechanisms for fleet identification and inter-database matching. A key component of the package consists of fleet-specific "wrapper functions", which were developed to ensure consistent and repeatable extractions by hard-coding fleet-specific information. Ancillary functions for summarizing and mapping the results are also described"--Abstract, page iv.

Permanent link to this Catalogue record:
publications.gc.ca/pub?id=9.905217&sl=0

Publication information
Department/Agency Canada. Department of Fisheries and Oceans. Maritimes Region. Population Ecology Division, issuing body.
Title Mar.fleets : an R package for integrating commercial catch and at-sea observer data from Maritimes region / by Mike McMahon and Heather Bowlby.
Series title Canadian technical report of fisheries and aquatic sciences, 1488-5379 ; 3450
Publication type Series - View Master Record
Language [English]
Format Electronic
Electronic document
Note(s) Includes bibliographical references (page 26).
Includes abstract in French.
Publishing information Dartmouth, NS : Fisheries and Oceans Canada, Science Branch, Maritimes Region, Population Ecology Division, 2021.
©2021
Author / Contributor McMahon, Mike, author.
Description 1 online resource (v, 28 pages) : illustrations, maps.
ISBN 9780660410463
Catalogue number
  • Fs97-6/3450E-PDF
Subject terms Fishery management -- Databases -- Maritime Provinces.
Pêches -- Gestion -- Bases de données -- Provinces maritimes.
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