Improving reliability of species identification and logbook catch reporting by commercial fishers in an Australian demersal shark longline fishery
Large adult carcharhinid and sphyrnid sharks have been targeted in coastal waters off New South Wales, eastern Australia, by commercial fishers using demersal longlines since 2005. Inaccurate fisher reporting of the composition of catches led in 2008 to a range of complementary management measures t...
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| Veröffentlicht in: | Fisheries management and ecology 2018-06, Vol.25 (3), p.186-202 |
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| container_title | Fisheries management and ecology |
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| creator | Macbeth, W. G. Butcher, P. A. Collins, D. McGrath, S. P. Provost, S. C. Bowling, A. C. Geraghty, P. T. Peddemors, V. M. |
| description | Large adult carcharhinid and sphyrnid sharks have been targeted in coastal waters off New South Wales, eastern Australia, by commercial fishers using demersal longlines since 2005. Inaccurate fisher reporting of the composition of catches led in 2008 to a range of complementary management measures to help improve reliability, including a redesigned catch logbook, species identification guide and at‐sea education via an observer programme. This study provides results from assessments of the effectiveness of those measures. A questionnaire yielded overwhelmingly positive feedback from fishers regarding the usefulness of the species identification guide. Comparison of observer‐recorded data and corresponding fisher‐reported logbook data via weighted linear mixed‐effects modelling found that since 2008, misreporting of catches has varied considerably among species and, for some species, among fishers. With some species commonly under‐reported and others frequently over‐reported, it is apparent that certain species were likely mistaken for other morphologically similar species. Such systematic error inherently undermines stock assessments of these vulnerable species. Management strategies designed to include education and extension will ensure greater reliability of fisher reporting of shark catches in the future. |
| doi_str_mv | 10.1111/fme.12276 |
| format | Article |
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G. ; Butcher, P. A. ; Collins, D. ; McGrath, S. P. ; Provost, S. C. ; Bowling, A. C. ; Geraghty, P. T. ; Peddemors, V. M.</creator><creatorcontrib>Macbeth, W. G. ; Butcher, P. A. ; Collins, D. ; McGrath, S. P. ; Provost, S. C. ; Bowling, A. C. ; Geraghty, P. T. ; Peddemors, V. M.</creatorcontrib><description>Large adult carcharhinid and sphyrnid sharks have been targeted in coastal waters off New South Wales, eastern Australia, by commercial fishers using demersal longlines since 2005. Inaccurate fisher reporting of the composition of catches led in 2008 to a range of complementary management measures to help improve reliability, including a redesigned catch logbook, species identification guide and at‐sea education via an observer programme. This study provides results from assessments of the effectiveness of those measures. A questionnaire yielded overwhelmingly positive feedback from fishers regarding the usefulness of the species identification guide. Comparison of observer‐recorded data and corresponding fisher‐reported logbook data via weighted linear mixed‐effects modelling found that since 2008, misreporting of catches has varied considerably among species and, for some species, among fishers. With some species commonly under‐reported and others frequently over‐reported, it is apparent that certain species were likely mistaken for other morphologically similar species. Such systematic error inherently undermines stock assessments of these vulnerable species. Management strategies designed to include education and extension will ensure greater reliability of fisher reporting of shark catches in the future.</description><identifier>ISSN: 0969-997X</identifier><identifier>EISSN: 1365-2400</identifier><identifier>DOI: 10.1111/fme.12276</identifier><language>eng</language><publisher>Oxford: Wiley Subscription Services, Inc</publisher><subject>Assessments ; carcharhinid ; catch composition ; Coastal waters ; Commercial species ; Composition ; Education ; fisher reporting ; Fisheries ; Fishers ; Identification ; Logbooks ; Longline fishing ; Marine fishes ; Modelling ; observer ; Observers ; Positive feedback ; Rangefinding ; Rare species ; Reliability ; shark fishing ; Sharks ; Species ; Species identification ; sphyrnid ; Stock assessment ; Threatened species ; Vulnerable species</subject><ispartof>Fisheries management and ecology, 2018-06, Vol.25 (3), p.186-202</ispartof><rights>2018 John Wiley & Sons Ltd</rights><rights>Copyright © 2018 John Wiley & Sons Ltd</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c2976-43a59617884e0bfc0896061dc3eca0d791779f5e48a4032acb72284a857789013</citedby><cites>FETCH-LOGICAL-c2976-43a59617884e0bfc0896061dc3eca0d791779f5e48a4032acb72284a857789013</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1111%2Ffme.12276$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1111%2Ffme.12276$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,776,780,1411,27901,27902,45550,45551</link.rule.ids></links><search><creatorcontrib>Macbeth, W. 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Management strategies designed to include education and extension will ensure greater reliability of fisher reporting of shark catches in the future.</description><subject>Assessments</subject><subject>carcharhinid</subject><subject>catch composition</subject><subject>Coastal waters</subject><subject>Commercial species</subject><subject>Composition</subject><subject>Education</subject><subject>fisher reporting</subject><subject>Fisheries</subject><subject>Fishers</subject><subject>Identification</subject><subject>Logbooks</subject><subject>Longline fishing</subject><subject>Marine fishes</subject><subject>Modelling</subject><subject>observer</subject><subject>Observers</subject><subject>Positive feedback</subject><subject>Rangefinding</subject><subject>Rare species</subject><subject>Reliability</subject><subject>shark fishing</subject><subject>Sharks</subject><subject>Species</subject><subject>Species identification</subject><subject>sphyrnid</subject><subject>Stock assessment</subject><subject>Threatened species</subject><subject>Vulnerable species</subject><issn>0969-997X</issn><issn>1365-2400</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNp1kM1OAyEURonRxFpd-AYkrlxMC8wPw7JpWm1S40YTd4RhoKWdgQpTzbyGTyx1uvVuSG7O-W74ALjHaILjTHWrJpgQWlyAEU6LPCEZQpdghFjBEsboxzW4CWGHECowYyPws2oP3n0Zu4FeNUZUpjFdD52G4aCkUQGaWtnOaCNFZ5yFwtawcZvKuT2MK7mN3sH57pRQ9VC6tlVeGtFAbcJW-RhwkuDsGDov4gULaxWREImwFX4f0-ymMVadhf4WXGnRBHV3fsfgfbl4mz8n69en1Xy2TiRhtEiyVOSswLQsM4UqLVHJivipWqZKClRThillOldZKTKUEiErSkiZiTKntGQIp2PwMOTGAj6PKnR8547expOcoIxGiTIaqceBkt6F4JXmB29a4XuOET9VzmPl_K_yyE4H9ts0qv8f5MuXxWD8AssehR8</recordid><startdate>201806</startdate><enddate>201806</enddate><creator>Macbeth, W. 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G.</au><au>Butcher, P. A.</au><au>Collins, D.</au><au>McGrath, S. P.</au><au>Provost, S. C.</au><au>Bowling, A. C.</au><au>Geraghty, P. T.</au><au>Peddemors, V. M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Improving reliability of species identification and logbook catch reporting by commercial fishers in an Australian demersal shark longline fishery</atitle><jtitle>Fisheries management and ecology</jtitle><date>2018-06</date><risdate>2018</risdate><volume>25</volume><issue>3</issue><spage>186</spage><epage>202</epage><pages>186-202</pages><issn>0969-997X</issn><eissn>1365-2400</eissn><abstract>Large adult carcharhinid and sphyrnid sharks have been targeted in coastal waters off New South Wales, eastern Australia, by commercial fishers using demersal longlines since 2005. 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| identifier | ISSN: 0969-997X |
| ispartof | Fisheries management and ecology, 2018-06, Vol.25 (3), p.186-202 |
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| language | eng |
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| source | Wiley Online Library Journals Frontfile Complete |
| subjects | Assessments carcharhinid catch composition Coastal waters Commercial species Composition Education fisher reporting Fisheries Fishers Identification Logbooks Longline fishing Marine fishes Modelling observer Observers Positive feedback Rangefinding Rare species Reliability shark fishing Sharks Species Species identification sphyrnid Stock assessment Threatened species Vulnerable species |
| title | Improving reliability of species identification and logbook catch reporting by commercial fishers in an Australian demersal shark longline fishery |
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