Supplementary material 1 (Video). “Pose” cleaning-request behavior of sailfish and response of marlin suckers.
(136.8MB, 00:00:53)撮影日：2022/10/13
撮影場所：Fukushima Marine Science Museum
Toshiaki Mori
2025/05/28登録
種類：Istiophorus platypterus
キーワード：sailfish ventilation remoras
動物界 >脊索動物門 >条鰭綱 >バショウカジキ目 >バショウカジキ科 >バショウカジキ属 >
動画はヒシコバンがバショウカジキの体表で遊泳しエラの中に戻った直後から始まる．バショウカジキはヒシコバンがエラの中で定位するのを待つかのように，遊泳速度を上げずにエラを開いている（10秒後まで）．バショウカジキはエラを閉じて尾鰭を大きく動かして遊泳を開始し（10～21秒後），その後，尾鰭の動きを止めて惰性で進む（21～27秒後）．再びエラの中から1個体のヒシコバンが現れると，バショウカジキは完全に鰭の動きを止め，エラを開き，背をそらせた姿勢で静止する（27～31秒後）．もう1個体のヒシコバンが，バショウカジキのエラから出現し，体表へ移動する．ヒシコバン2個体が，バショウカジキの体表に沿って第一臀鰭付近まで移動する．この間，バショウカジキはエラを閉じている（32～39秒後）．ヒシコバン2個体がバショウカジキの胸鰭付近に戻ると，バショウカジキはエラを大きく開く．ヒシコバン2個体がバショウカジキのエラの中に戻る（39～45秒後）．バショウカジキはゆっくり遊泳を始めるが，ヒシコバンが完全にエラの中に戻るまでエラを開けた状態で遊泳している（45～50秒後）．その後，バショウカジキはエラを閉じ遊泳速度を上げる．
Below is the abstract from the article containing this video:
The symbiotic relationship between remoras and their hosts is difficult to comprehensively evaluate, as hosts may experience both benefits and disadvantages from their interaction with remoras. This study observed behaviors of sailfish (Istiophorus platypterus) and marlin suckers (Remora osteochir) in an aquarium by filming them. The marlin suckers displayed cleaning behavior, inserting their heads into small depressions along the base of the sailfish's fins and pecking at the host's injured snout. In response, the sailfish reduced its swimming speed and opened its operculum, allowing the marlin sucker to exit the gill cavity. These behaviors were consistent with the typical "cleaning–request" behavior observed in host species interacting with cleaner fish. Our observations strongly suggest a symbiotic relationship between the two species. Digital video images related to the article are available at http://www.momo-p.com/showdetail-e.php?movieid=momo250502ip07a, http://www. momo-p.com/showdetail-e.php?movieid=momo250502ip09a, and http://www.momo-p.com/showdetail-e.php?movieid= momo250502ip05a.
Toshiaki Mori, Kenichi Fujii, Kaori Fujii, Akira Komoda, and Takuzo Abe (2025) Symbiotic cleaning relationship between a sailfish (Istiophorus platypterus) and remoras (Remora osteochir). J. Ethol. 10.1007/s10164-025-00852-w
