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Zoarchias major Eelpouts Fighting | Japan

Two mature male Zoarchias major eelpouts opening their mouths as wide as possible during a protracted confrontation. From personal observation, it seems likely that the size of the mouth when wide open serves as a means of relative strength comparison. This type of behavior is exhibited during the spring and summer months, presumably associated with reproduction.

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Filename: zoarchias-major-male-eelpouts-competitive-fighting-201806-0127.tif
Copyright: Copyright Tony Wu. All rights reserved. No duplication, reproduction or usage without prior written permission.
Image Size: 6929x4619 / 91.6MB; https://www.photoshelter.com/support/license#rm; https://www.tony-wu.com/contact-tony-wu; Bony Fish Eelpout Animalia Chordata Osteichthyes Actinopterygii Perciformes Zoarcidae Neozoarcinae Zoarchias major Ookazunagi; オオカズナギ Open Mouth Fighting Reproduction Pacific Japan Yamaguchi Prefecture
Contained in galleries: Say Ahhhhh!, Fish Photos, Marine Life | Japan

Two mature male Zoarchias major eelpouts opening their mouths as wide as possible during a protracted confrontation. From personal observation, it seems likely that the size of the mouth when wide open serves as a means of relative strength comparison. This type of behavior is exhibited during the spring and summer months, presumably associated with reproduction.