Killer whale (Orcinus orca) interactions with blue-eye trevalla (Hyperoglyphe antarctica) longline fisheries
Over the past five decades, marine mammal interactions with fisheries have become a major human-wildlife conflict globally. The emergence of longline fishing is concomitant with the development of depredation-type interactions i.e., marine mammals feeding on fish caught on hooks. The killer whale (O...
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ftdeakinunifig:oai:figshare.com:article/20794588 2024-06-23T07:47:43+00:00 Killer whale (Orcinus orca) interactions with blue-eye trevalla (Hyperoglyphe antarctica) longline fisheries P Tixier MA Lea MA Hindell C Guinet N Gasco G Duhamel John Arnould 2018-01-01T00:00:00Z http://hdl.handle.net/10536/DRO/DU:30113093 https://figshare.com/articles/journal_contribution/Killer_whale_Orcinus_orca_interactions_with_blue-eye_trevalla_Hyperoglyphe_antarctica_longline_fisheries/20794588 unknown http://hdl.handle.net/10536/DRO/DU:30113093 https://figshare.com/articles/journal_contribution/Killer_whale_Orcinus_orca_interactions_with_blue-eye_trevalla_Hyperoglyphe_antarctica_longline_fisheries/20794588 All Rights Reserved Zoology not elsewhere classified Science & Technology Multidisciplinary Sciences Science & Technology - Other Topics Fisheries Killer whale Fisheries interaction Orcinus orca Blue-eye trevalla Hyperoglyphe antarctica Depredation Longline fisheries PATAGONIAN TOOTHFISH FISHERY ATTRACT SPERM-WHALES MARINE MAMMALS PSEUDORCA-CRASSIDENS DEPREDATION LEVELS FISHING PRACTICES CROZET ISLANDS ALASKA SOUTHERN BEHAVIOR LP160100329 School of Life and Environmental Sciences 3103 Ecology Text Journal contribution 2018 ftdeakinunifig 2024-06-06T02:05:01Z Over the past five decades, marine mammal interactions with fisheries have become a major human-wildlife conflict globally. The emergence of longline fishing is concomitant with the development of depredation-type interactions i.e., marine mammals feeding on fish caught on hooks. The killer whale (Orcinus orca) is one of the species most involved in depredation on longline fisheries. The issue was first reported in high latitudes but, with increasing expansion of this fishing method, other fisheries have begun to experience interactions. The present study investigated killer whale interactions with two geographically isolated blue-eye trevalla (Hyperoglyphe antarctica) fisheries operating in temperate waters off Amsterdam/St. Paul Islands (Indian Ocean) and south-eastern Australia. These two fisheries differ in the fishing technique used (vertical vs. demersal longlines), effort, catch, fleet size and fishing area size. Using 7-year (2010–16) long fishing and observation datasets, this study estimated the levels of killer whale interactions and examined the influence of spatio-temporal and operational variables on the probability of vessels to experience interactions. Killer whales interactions occurred during 58.4% and 21.2% of all fishing days, and over 94% and 47.4% of the fishing area for both fisheries, respectively. In south-eastern Australia, the probability of occurrence of killer whale interactions during fishing days varied seasonally with a decrease in spring, increased with the daily fishing effort and decreased with the distance travelled by the vessel between fishing days. In Amsterdam/St. Paul, this probability was only influenced by latitude, with an increase in the southern part of the area. Together, these findings document two previously unreported cases of high killer whale depredation, and provide insights on ways to avoid the issue. The study also emphasizes the need to further examine the local characteristics of fisheries and the ecology of local depredating killer whale populations in as ... Article in Journal/Newspaper Antarc* Antarctica Crozet Islands Killer Whale Orca Orcinus orca Patagonian Toothfish Paul Islands Alaska Killer whale DRO - Deakin Research Online Indian Paul Islands ENVELOPE(-63.716,-63.716,-64.283,-64.283) |
institution |
Open Polar |
collection |
DRO - Deakin Research Online |
op_collection_id |
ftdeakinunifig |
language |
unknown |
topic |
Zoology not elsewhere classified Science & Technology Multidisciplinary Sciences Science & Technology - Other Topics Fisheries Killer whale Fisheries interaction Orcinus orca Blue-eye trevalla Hyperoglyphe antarctica Depredation Longline fisheries PATAGONIAN TOOTHFISH FISHERY ATTRACT SPERM-WHALES MARINE MAMMALS PSEUDORCA-CRASSIDENS DEPREDATION LEVELS FISHING PRACTICES CROZET ISLANDS ALASKA SOUTHERN BEHAVIOR LP160100329 School of Life and Environmental Sciences 3103 Ecology |
spellingShingle |
Zoology not elsewhere classified Science & Technology Multidisciplinary Sciences Science & Technology - Other Topics Fisheries Killer whale Fisheries interaction Orcinus orca Blue-eye trevalla Hyperoglyphe antarctica Depredation Longline fisheries PATAGONIAN TOOTHFISH FISHERY ATTRACT SPERM-WHALES MARINE MAMMALS PSEUDORCA-CRASSIDENS DEPREDATION LEVELS FISHING PRACTICES CROZET ISLANDS ALASKA SOUTHERN BEHAVIOR LP160100329 School of Life and Environmental Sciences 3103 Ecology P Tixier MA Lea MA Hindell C Guinet N Gasco G Duhamel John Arnould Killer whale (Orcinus orca) interactions with blue-eye trevalla (Hyperoglyphe antarctica) longline fisheries |
topic_facet |
Zoology not elsewhere classified Science & Technology Multidisciplinary Sciences Science & Technology - Other Topics Fisheries Killer whale Fisheries interaction Orcinus orca Blue-eye trevalla Hyperoglyphe antarctica Depredation Longline fisheries PATAGONIAN TOOTHFISH FISHERY ATTRACT SPERM-WHALES MARINE MAMMALS PSEUDORCA-CRASSIDENS DEPREDATION LEVELS FISHING PRACTICES CROZET ISLANDS ALASKA SOUTHERN BEHAVIOR LP160100329 School of Life and Environmental Sciences 3103 Ecology |
description |
Over the past five decades, marine mammal interactions with fisheries have become a major human-wildlife conflict globally. The emergence of longline fishing is concomitant with the development of depredation-type interactions i.e., marine mammals feeding on fish caught on hooks. The killer whale (Orcinus orca) is one of the species most involved in depredation on longline fisheries. The issue was first reported in high latitudes but, with increasing expansion of this fishing method, other fisheries have begun to experience interactions. The present study investigated killer whale interactions with two geographically isolated blue-eye trevalla (Hyperoglyphe antarctica) fisheries operating in temperate waters off Amsterdam/St. Paul Islands (Indian Ocean) and south-eastern Australia. These two fisheries differ in the fishing technique used (vertical vs. demersal longlines), effort, catch, fleet size and fishing area size. Using 7-year (2010–16) long fishing and observation datasets, this study estimated the levels of killer whale interactions and examined the influence of spatio-temporal and operational variables on the probability of vessels to experience interactions. Killer whales interactions occurred during 58.4% and 21.2% of all fishing days, and over 94% and 47.4% of the fishing area for both fisheries, respectively. In south-eastern Australia, the probability of occurrence of killer whale interactions during fishing days varied seasonally with a decrease in spring, increased with the daily fishing effort and decreased with the distance travelled by the vessel between fishing days. In Amsterdam/St. Paul, this probability was only influenced by latitude, with an increase in the southern part of the area. Together, these findings document two previously unreported cases of high killer whale depredation, and provide insights on ways to avoid the issue. The study also emphasizes the need to further examine the local characteristics of fisheries and the ecology of local depredating killer whale populations in as ... |
format |
Article in Journal/Newspaper |
author |
P Tixier MA Lea MA Hindell C Guinet N Gasco G Duhamel John Arnould |
author_facet |
P Tixier MA Lea MA Hindell C Guinet N Gasco G Duhamel John Arnould |
author_sort |
P Tixier |
title |
Killer whale (Orcinus orca) interactions with blue-eye trevalla (Hyperoglyphe antarctica) longline fisheries |
title_short |
Killer whale (Orcinus orca) interactions with blue-eye trevalla (Hyperoglyphe antarctica) longline fisheries |
title_full |
Killer whale (Orcinus orca) interactions with blue-eye trevalla (Hyperoglyphe antarctica) longline fisheries |
title_fullStr |
Killer whale (Orcinus orca) interactions with blue-eye trevalla (Hyperoglyphe antarctica) longline fisheries |
title_full_unstemmed |
Killer whale (Orcinus orca) interactions with blue-eye trevalla (Hyperoglyphe antarctica) longline fisheries |
title_sort |
killer whale (orcinus orca) interactions with blue-eye trevalla (hyperoglyphe antarctica) longline fisheries |
publishDate |
2018 |
url |
http://hdl.handle.net/10536/DRO/DU:30113093 https://figshare.com/articles/journal_contribution/Killer_whale_Orcinus_orca_interactions_with_blue-eye_trevalla_Hyperoglyphe_antarctica_longline_fisheries/20794588 |
long_lat |
ENVELOPE(-63.716,-63.716,-64.283,-64.283) |
geographic |
Indian Paul Islands |
geographic_facet |
Indian Paul Islands |
genre |
Antarc* Antarctica Crozet Islands Killer Whale Orca Orcinus orca Patagonian Toothfish Paul Islands Alaska Killer whale |
genre_facet |
Antarc* Antarctica Crozet Islands Killer Whale Orca Orcinus orca Patagonian Toothfish Paul Islands Alaska Killer whale |
op_relation |
http://hdl.handle.net/10536/DRO/DU:30113093 https://figshare.com/articles/journal_contribution/Killer_whale_Orcinus_orca_interactions_with_blue-eye_trevalla_Hyperoglyphe_antarctica_longline_fisheries/20794588 |
op_rights |
All Rights Reserved |
_version_ |
1802651880706277376 |