Non-lunge feeding behaviour of humpback whales associated with fishing boats in Norway
Top marine predators, such as odontocetes, pinnipeds, and seabirds, are known to forage around fishing boats as fishermen aggregate and/or discard their prey. Recently, incidents of humpback whales interacting with fishing boats have been reported. However, whether humpback whales utilise discard fi...
Published in: | Ethology |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2023
|
Subjects: | |
Online Access: | https://hdl.handle.net/11250/3111732 https://doi.org/10.1111/eth.13419 |
id |
ftimr:oai:imr.brage.unit.no:11250/3111732 |
---|---|
record_format |
openpolar |
spelling |
ftimr:oai:imr.brage.unit.no:11250/3111732 2024-02-11T10:04:37+01:00 Non-lunge feeding behaviour of humpback whales associated with fishing boats in Norway Iwata, Takashi Aoki, Kagari Miller, Patrick J. O. Biuw, Martin Williamson, Michael J. Sato, Katsufumi 2023 application/pdf https://hdl.handle.net/11250/3111732 https://doi.org/10.1111/eth.13419 eng eng Ethology. 2023, . urn:issn:0179-1613 https://hdl.handle.net/11250/3111732 https://doi.org/10.1111/eth.13419 cristin:2206369 6 Ethology Peer reviewed Journal article 2023 ftimr https://doi.org/10.1111/eth.13419 2024-01-17T23:47:42Z Top marine predators, such as odontocetes, pinnipeds, and seabirds, are known to forage around fishing boats as fishermen aggregate and/or discard their prey. Recently, incidents of humpback whales interacting with fishing boats have been reported. However, whether humpback whales utilise discard fish as a food source and how they forage around fishing boats is unknown. This study reports, for the first time, the foraging behaviour of a humpback whale around fishing boats. Three whales were tagged using a suction-cup tag containing a video camera, and a behavioural data logger in the coastal area of Tromsø, Norway. Video data from one tagged whale showed that the whale remained in close vicinity of fishing boats for 43 min, and revealed the presence of large numbers of dead fish, fish-eating killer whales, fishing boats, and fishing gear. In waters with large numbers of dead fish, the whale raised its upper jaw, a motion associated with engulfing discard fish from fishing boats, and this feeding behaviour differed markedly from lunge-feeding observed in two other whales in the same area. This behaviour was defined as “pick-up feeding”. No lunge feeding was seen on the data logger when the whale foraged around fishing boats. This study highlights a novel humpback whale foraging strategy: low energy gain from scattered prey but also low energy costs as high-energy lunge feeding is not required. publishedVersion Article in Journal/Newspaper Humpback Whale Tromsø Institute for Marine Research: Brage IMR Norway Tromsø Ethology 130 2 |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
description |
Top marine predators, such as odontocetes, pinnipeds, and seabirds, are known to forage around fishing boats as fishermen aggregate and/or discard their prey. Recently, incidents of humpback whales interacting with fishing boats have been reported. However, whether humpback whales utilise discard fish as a food source and how they forage around fishing boats is unknown. This study reports, for the first time, the foraging behaviour of a humpback whale around fishing boats. Three whales were tagged using a suction-cup tag containing a video camera, and a behavioural data logger in the coastal area of Tromsø, Norway. Video data from one tagged whale showed that the whale remained in close vicinity of fishing boats for 43 min, and revealed the presence of large numbers of dead fish, fish-eating killer whales, fishing boats, and fishing gear. In waters with large numbers of dead fish, the whale raised its upper jaw, a motion associated with engulfing discard fish from fishing boats, and this feeding behaviour differed markedly from lunge-feeding observed in two other whales in the same area. This behaviour was defined as “pick-up feeding”. No lunge feeding was seen on the data logger when the whale foraged around fishing boats. This study highlights a novel humpback whale foraging strategy: low energy gain from scattered prey but also low energy costs as high-energy lunge feeding is not required. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Iwata, Takashi Aoki, Kagari Miller, Patrick J. O. Biuw, Martin Williamson, Michael J. Sato, Katsufumi |
spellingShingle |
Iwata, Takashi Aoki, Kagari Miller, Patrick J. O. Biuw, Martin Williamson, Michael J. Sato, Katsufumi Non-lunge feeding behaviour of humpback whales associated with fishing boats in Norway |
author_facet |
Iwata, Takashi Aoki, Kagari Miller, Patrick J. O. Biuw, Martin Williamson, Michael J. Sato, Katsufumi |
author_sort |
Iwata, Takashi |
title |
Non-lunge feeding behaviour of humpback whales associated with fishing boats in Norway |
title_short |
Non-lunge feeding behaviour of humpback whales associated with fishing boats in Norway |
title_full |
Non-lunge feeding behaviour of humpback whales associated with fishing boats in Norway |
title_fullStr |
Non-lunge feeding behaviour of humpback whales associated with fishing boats in Norway |
title_full_unstemmed |
Non-lunge feeding behaviour of humpback whales associated with fishing boats in Norway |
title_sort |
non-lunge feeding behaviour of humpback whales associated with fishing boats in norway |
publishDate |
2023 |
url |
https://hdl.handle.net/11250/3111732 https://doi.org/10.1111/eth.13419 |
geographic |
Norway Tromsø |
geographic_facet |
Norway Tromsø |
genre |
Humpback Whale Tromsø |
genre_facet |
Humpback Whale Tromsø |
op_source |
6 Ethology |
op_relation |
Ethology. 2023, . urn:issn:0179-1613 https://hdl.handle.net/11250/3111732 https://doi.org/10.1111/eth.13419 cristin:2206369 |
op_doi |
https://doi.org/10.1111/eth.13419 |
container_title |
Ethology |
container_volume |
130 |
container_issue |
2 |
_version_ |
1790601281775075328 |