Quantifying the relative intensity of fishing on New Zealand seamounts
New Zealand seamounts support major fisheries for several deepwater fish species, including orange roughy (Hoplostethus atlanticus) and smooth oreo (Pseudocyttus maculatus). Although a high proportion of features in the depth range 500-1000 m have been fished, very little is known about the ecologic...
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Published in | New Zealand journal of marine and freshwater research Vol. 39; no. 4; pp. 839 - 850 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Taylor & Francis Group
01.06.2005
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Abstract | New Zealand seamounts support major fisheries for several deepwater fish species, including orange roughy (Hoplostethus atlanticus) and smooth oreo (Pseudocyttus maculatus). Although a high proportion of features in the depth range 500-1000 m have been fished, very little is known about the ecological impacts of bottom trawling on seamounts. The potential impact is likely to be influenced by the spatial extent and frequency of fishing. A new index is presented to assess the relative intensity of trawling on New Zealand seamounts. The fishing effects index (FEI) incorporates information on the density of fishing on the seamount as a proportion of the seabed area and also on tow direction. Detailed fisheries data from more than 250 000 tows were examined to calculate FEI for New Zealand seamounts. The most intensively fished seamounts were on the south Chatham Rise, an area characterised by a large number of relatively small features which were fished serially for orange roughy in the 1980s and 1990s. Other seamounts with high FEI were on the north Chatham Rise, Challenger Plateau, and off the east coast of the North Island. A range of sensitivity analyses indicated that the general rankings of seamounts were relatively robust to the choice of arbitrary thresholds used to assign tows to seamounts. |
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AbstractList | New Zealand seamounts support major fisheries for several deepwater fish species, including orange roughy (Hoplostethus atlanticus) and smooth oreo (Pseudocyttus maculatus). Although a high proportion of features in the depth range 500-1000 m have been fished, very little is known about the ecological impacts of bottom trawling on seamounts. The potential impact is likely to be influenced by the spatial extent and frequency of fishing. A new index is presented to assess the relative intensity of trawling on New Zealand seamounts. The fishing effects index (FEI) incorporates information on the density of fishing on the seamount as a proportion of the seabed area and also on tow direction. Detailed fisheries data from more than 250 000 tows were examined to calculate FEI for New Zealand seamounts. The most intensively fished seamounts were on the south Chatham Rise, an area characterised by a large number of relatively small features which were fished serially for orange roughy in the 1980s and 1990s. Other seamounts with high FEI were on the north Chatham Rise, Challenger Plateau, and off the east coast of the North Island. A range of sensitivity analyses indicated that the general rankings of seamounts were relatively robust to the choice of arbitrary thresholds used to assign tows to seamounts. Seamount regions around New Zealand support deepwater fisheries, including those for orange roughy and smooth oreo. To better understand the ecological impacts of bottom trawling in seamount areas, the relative intensity of fishing in those areas needs to be known. The fishing effects index (FEI) was developed to fill this need. FEI is calculated using data on the density of fishing on the seamount as a proportion of the seabed area and data on tow direction. FEI calculations for New Zealand seamounts show that the most intensively fished areas are the south and north Chatham Rise areas, Challenger Plateau, and the east coast of the North Island. Sensitivity analyses suggest that seamount FEI rankings are relatively robust to the arbitrary threshold choices used to assign tows to seamounts. |
Author | O'Driscoll, Richard L. Clark, Malcolm R. |
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Cites_doi | 10.3354/meps155159 10.1071/MF9900111 10.3354/meps182119 10.1890/1051-0761(1998)008[0866:DOTMBH]2.0.CO;2 10.1002/aqc.3270050305 10.1002/(SICI)1099-0755(199911/12)9:6<601::AID-AQC365>3.0.CO;2-O 10.1006/jmsc.2000.0911 10.1016/0165-7836(87)90014-2 10.1006/jmsc.2000.0928 10.1006/jmsc.2000.0915 10.1016/S0065-2881(08)60065-6 10.1016/0302-184X(84)90002-7 10.1016/S0165-7836(99)00121-6 10.3354/meps213111 10.2960/J.v31.a34 10.1016/S0278-4343(03)00122-5 10.1080/00288330.1992.9516500 10.1002/(SICI)1099-0755(199703)7:1<27::AID-AQC214>3.0.CO;2-9 10.1006/jmsc.1997.0326 |
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Snippet | New Zealand seamounts support major fisheries for several deepwater fish species, including orange roughy (Hoplostethus atlanticus) and smooth oreo... Seamount regions around New Zealand support deepwater fisheries, including those for orange roughy and smooth oreo. To better understand the ecological impacts... |
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SubjectTerms | deepwater fisheries fishing effort distribution Hoplostethus atlanticus impacts of trawling Marine orange roughy Pseudocyttus maculatus seamounts |
Title | Quantifying the relative intensity of fishing on New Zealand seamounts |
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