Effectiveness of fully documented fisheries to estimate discards in a participatory research scheme

Lars O. Mortensen, Clara Ulrich, Hans Jakob Olesen, Heidrikur Bergsson, Casper Willestofte Berg, Nikolaos Tzamouranis, Jørgen Dalskov

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

A key challenge for fisheries science and management is the access to reliable and verifiable catch data. In science, the challenge is to collect reliable, precise and traceable data to provide sound advice. In management, the challenge is that catch documentation is necessary to enforce regulations. Currently,
catch inspection at sea, self-reporting through e-log and on-board observers are the primary methods to document catches at sea. However, at-sea control and on-board observers are costly and have limited coverage, while self-reporting is susceptible to fraud and provides limited coverage. New cost-effective methods are currently emerging involving Remote Electronic Monitoring (REM) and on-board cameras. Previous studies have tested REM with promising results. However, evaluation of the potential biases of REM is needed before full benefits can be obtained. We deployed REM with on-board cameras on 14 fishing vessels and were able to inspect 56% of 1523 hauls made in the 6 month trial period, using an estimated 582 man-hours of video audit. The results showed an overall good agreement between the fishers self-reported discards and the video inspectors discard estimates. However, there was large
variation in precision between individual vessels and species. Additionally, trial setup and process errors were shown to have a large effect on the precision of the video inspectors discard estimates. Nevertheless, despite challenges, REM was evaluated to have the potential to streamline monitoring and scientific
documentation in a medium-size fishing fleet
Original languageEnglish
JournalFisheries Research
Volume187
Pages (from-to)150-157
ISSN0165-7836
DOIs
Publication statusPublished - 2017

Cite this

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title = "Effectiveness of fully documented fisheries to estimate discards in a participatory research scheme",
abstract = "A key challenge for fisheries science and management is the access to reliable and verifiable catch data. In science, the challenge is to collect reliable, precise and traceable data to provide sound advice. In management, the challenge is that catch documentation is necessary to enforce regulations. Currently,catch inspection at sea, self-reporting through e-log and on-board observers are the primary methods to document catches at sea. However, at-sea control and on-board observers are costly and have limited coverage, while self-reporting is susceptible to fraud and provides limited coverage. New cost-effective methods are currently emerging involving Remote Electronic Monitoring (REM) and on-board cameras. Previous studies have tested REM with promising results. However, evaluation of the potential biases of REM is needed before full benefits can be obtained. We deployed REM with on-board cameras on 14 fishing vessels and were able to inspect 56{\%} of 1523 hauls made in the 6 month trial period, using an estimated 582 man-hours of video audit. The results showed an overall good agreement between the fishers self-reported discards and the video inspectors discard estimates. However, there was largevariation in precision between individual vessels and species. Additionally, trial setup and process errors were shown to have a large effect on the precision of the video inspectors discard estimates. Nevertheless, despite challenges, REM was evaluated to have the potential to streamline monitoring and scientificdocumentation in a medium-size fishing fleet",
author = "Mortensen, {Lars O.} and Clara Ulrich and Olesen, {Hans Jakob} and Heidrikur Bergsson and Berg, {Casper Willestofte} and Nikolaos Tzamouranis and J{\o}rgen Dalskov",
year = "2017",
doi = "10.1016/j.fishres.2016.11.010",
language = "English",
volume = "187",
pages = "150--157",
journal = "Fisheries Research",
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publisher = "Elsevier",

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Effectiveness of fully documented fisheries to estimate discards in a participatory research scheme. / Mortensen, Lars O.; Ulrich, Clara; Olesen, Hans Jakob; Bergsson, Heidrikur ; Berg, Casper Willestofte; Tzamouranis, Nikolaos; Dalskov, Jørgen.

In: Fisheries Research, Vol. 187, 2017, p. 150-157.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Effectiveness of fully documented fisheries to estimate discards in a participatory research scheme

AU - Mortensen, Lars O.

AU - Ulrich, Clara

AU - Olesen, Hans Jakob

AU - Bergsson, Heidrikur

AU - Berg, Casper Willestofte

AU - Tzamouranis, Nikolaos

AU - Dalskov, Jørgen

PY - 2017

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N2 - A key challenge for fisheries science and management is the access to reliable and verifiable catch data. In science, the challenge is to collect reliable, precise and traceable data to provide sound advice. In management, the challenge is that catch documentation is necessary to enforce regulations. Currently,catch inspection at sea, self-reporting through e-log and on-board observers are the primary methods to document catches at sea. However, at-sea control and on-board observers are costly and have limited coverage, while self-reporting is susceptible to fraud and provides limited coverage. New cost-effective methods are currently emerging involving Remote Electronic Monitoring (REM) and on-board cameras. Previous studies have tested REM with promising results. However, evaluation of the potential biases of REM is needed before full benefits can be obtained. We deployed REM with on-board cameras on 14 fishing vessels and were able to inspect 56% of 1523 hauls made in the 6 month trial period, using an estimated 582 man-hours of video audit. The results showed an overall good agreement between the fishers self-reported discards and the video inspectors discard estimates. However, there was largevariation in precision between individual vessels and species. Additionally, trial setup and process errors were shown to have a large effect on the precision of the video inspectors discard estimates. Nevertheless, despite challenges, REM was evaluated to have the potential to streamline monitoring and scientificdocumentation in a medium-size fishing fleet

AB - A key challenge for fisheries science and management is the access to reliable and verifiable catch data. In science, the challenge is to collect reliable, precise and traceable data to provide sound advice. In management, the challenge is that catch documentation is necessary to enforce regulations. Currently,catch inspection at sea, self-reporting through e-log and on-board observers are the primary methods to document catches at sea. However, at-sea control and on-board observers are costly and have limited coverage, while self-reporting is susceptible to fraud and provides limited coverage. New cost-effective methods are currently emerging involving Remote Electronic Monitoring (REM) and on-board cameras. Previous studies have tested REM with promising results. However, evaluation of the potential biases of REM is needed before full benefits can be obtained. We deployed REM with on-board cameras on 14 fishing vessels and were able to inspect 56% of 1523 hauls made in the 6 month trial period, using an estimated 582 man-hours of video audit. The results showed an overall good agreement between the fishers self-reported discards and the video inspectors discard estimates. However, there was largevariation in precision between individual vessels and species. Additionally, trial setup and process errors were shown to have a large effect on the precision of the video inspectors discard estimates. Nevertheless, despite challenges, REM was evaluated to have the potential to streamline monitoring and scientificdocumentation in a medium-size fishing fleet

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