동료 물고기를 마구 때리는 문어...왜 VIDEO: Octopus punches fish in the head (just because it can)

Octopus punches fish in the head (just because it can)

By Mindy Weisberger - Senior Writer 13 hours ago


Collaborating with a cephalopod isn't risk-free.


Why do octopuses have eight arms? The better to punch fish with, new research reveals.


These brainy cephalopods sometimes team up with fish to find food; hunting collaboratively like this allows them to cover more area, and it increases their chances of catching prey. However, when big blue octopuses (Octopus cyanea), also known as day octopuses, are displeased with their fish partners, they demonstrate their ire by suddenly punching the fish in the head.


To punch, or not to punch: That is the question.

(Image: © Sampaio, E., M.C. Seco, R. Rosa, and S. Gingins. 2021. Ecology. doi.org/10.1002/ecy.3266)


 

동료 물고기를 마구 때리는 문어...왜


문어는 왜 팔이 8개일까? 

물고기를 때리기에 편하다는 새로운 연구가 밝혀지고 있다.




이 머리가 좋은 두족류들은 먹이를 찾기 위해 때때로 물고기와 팀을 이뤄서 사냥한다; 이와 같이 협력적으로 사냥하는 것은 그들이 더 많은 지역을 커버할 수 있게 하고, 먹이를 잡을 가능성을 증가시킨다. 하지만, 큰 푸른 문어들이 물고기에게 불쾌함을 느낄 때, 그들은 갑자기 물고기의 머리를 치면서 그들의 분노를 표출한다.


이 문어는 "우리가 펀칭"이라고 부르는 공격에서 "한 팔로 빠르고 폭발적인 동작"을 사용하는 것이 과학자들의 새로운 연구에서 밝혀졌다.


문어와 산호초 어류 사이의 일시적인 사냥 동맹은 수십 년 동안 기록되어 왔고 다양한 종의 다양한 참여자들이 참여할 수 있다고 12월 18일 Economy 저널에서 연구 저자들이 보도했다.


때때로, 물고기와 문어는 서로 다른 종들이 다른 장소를 정찰하면서 한 시간 이상 함께 일합니다. 연구에 따르면, 문어들은 암초에서 바위 주위를 돌면서 좁은 공간으로 뛰어드는 먹이를 쫓고, 황새치 같은 바닥에서 먹이를 주는 물고기들은 해저 바닥을 훑고, 다른 물고기 종들은 물기둥을 순찰한다고 한다.




하지만 이러한 협력은 어류에게 항상 잘 되는 것은 아니라고 새로운 연구는 보여준다. 2018년과 2019년 사이에, 연구원들은 이스라엘의 아일랏과 이집트의 엘 쿠세이르에서 다이빙을 하는 동안 문어들이 갑자기 그들의 추정 파트너를 주먹으로 때리는 8건의 사건을 관찰했다.


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황기철 콘페이퍼 에디터

Ki Chul Hwang Conpaper editor 


edited by kcontents


The octopus lashes out using "a swift, explosive motion with one arm," in an attack "which we refer to as punching," scientists wrote in a new study.


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Temporary hunting alliances between octopuses and coral reef fish have been documented for decades and can involve multiple participants of various species, the study authors reported Dec. 18 in the journal Ecology. 




Sometimes, fish and octopuses will work together for more than an hour, with different species scouting different locations. Octopuses pursue prey that dart around rocks and into tight spaces in the reef, while bottom-feeding fish such as the yellow-saddle goatfish (Parupeneus cyclostomus) scour the seafloor, and other fish species patrol the water column, according to the study.


But those collaborations don't always work out so well for the fish, the new study shows. Between 2018 and 2019, researchers observed eight incidents while diving in Eilat, Israel, and in El Quseir, Egypt, in which octopuses suddenly punched out their supposed partners. 


"I laughed out loud, and almost choked on my own regulator," said lead study author Eduardo Sampaio, a Ph.D. student at the University of Lisbon and the Max Planck Institute of Animal Behavior. His later reactions were more subdued, "but I still marveled at it every time I saw it," he told Live Science in an email. 


"The fish would get pushed to the edge of the group, or would actually leave the group. Sometimes after a while it would return, other times it would not return at all. The octopus would leave the fish alone after displacing it," he said. Though octopuses were previously known to throw defensive punches when attacked by damselfishes or while fighting over food, this is the first time their punching has been scientifically described and linked to collaborative hunting, Sampaio said in the email. 


A day octopus socks a goldsaddle goatfish in waters near Eilat, Israel, on Oct. 17, 2018. Octopuses may punch a fish ally out of the way to capture prey ... but sometimes it's not clear why they do it.


 

A day octopus socks a goldsaddle goatfish in waters near Eilat, Israel, on Oct. 17, 2018. Octopuses may punch a fish ally out of the way to capture prey ... but sometimes it's not clear why they do it. (Image credit: Sampaio, E., M.C. Seco, R. Rosa, and S. Gingins. 2021. Ecology. doi.org/10.1002/ecy.3266)

Partners, but not friends




But why were the octopuses lashing out? While partnerships between species can be mutually beneficial, that doesn't mean that the participants are actually looking out for each other's best interests, Sampaio explained. If opportunity knocks, alliances may be discarded, and the octopus will look out for itself.


"Despite collaborating, each partner will always try to maximize its benefits," he said. "In the cases where prey is readily available, the octopus seems to use 'punching' as a way to control the partner's behavior in a self-serving way," literally knocking aside the competition to steal a tempting meal. 


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