To knot or not? Novel feeding behaviours in moray eels
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We report observations of a novel feeding behaviour in the moray eel Gymnothorax favagineus (Bloch & Schneider, 1801) and a previously undocumented application of “knotting” behaviour in G. fimbriatus (Bennett, 1832). Moray eels were filmed by baited remote underwater video systems (BRUVS) at the Scott Reefs, a remote group of atoll-like reefs on the edge of the continental shelf in tropical, northwestern Australia. Two behaviours were observed as the moray eels tried to dislodge food from a bait bag: (1) G. favagineus used its tail as a “paddle” to gain leverage on the bag, and (2) G. fimbriatus tied a knot in its tail in order to extract food from the bag. Our observations suggest that morays have an extensive behavioural repertoire for manipulating and extracting large prey items from the interstices of the reefs where they typically hunt.
KeywordsGymnothorax Feeding Coral reef Knotting Baited remote underwater video systems BRUVS
We would like to thank the Australian Institute of Marine Science for the use of its research vessel, the RV Solander, and for the support of its crew. We also acknowledge the Department of Fisheries, the Department of Parks and Wildlife (DPaW) and the Department of Sustainability, Environment, Water, Population and Communities for arranging permits to conduct research at the Scott Reefs. Experimental protocols were approved by the University of Western Australia’s Animal Ethics Committee (RA3/100/1279, RA3/100/1172), and were carried out in accordance with the approved guidelines.
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