Supplementary material 3 (Video). “Cleaning-like” behavior of marlin suckers toward a sailfish.
(135.7MB, 00:00:53)撮影日：2022/10/22
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 >
ヒシコバン1個体がバショウカジキの胸鰭に沿うように遊泳し，その後，バショウカジキのエラの中に戻る（6秒後）．バショウカジキは，ヒシコバンが完全にエラの中に戻るまで鰓ポンプ換水を行いながら遊泳し（6～30秒後），その後，ラム換水に切り替えて遊泳する（30～33秒後）．バショウカジキが遊泳速度を落としてエラを開くと（33～34秒後），ヒシコバン1個体がエラの中から体表に沿うように出現する．同時にバショウカジキは背鰭を開き遊泳速度を落とす．ヒシコバンはバショウカジキの体表を沿うように後方へ移動し，臀鰭の隙間に頭部入れて何かを食みとるような行動を示す（40〜41秒後）．その後，ヒシコバンはバショウカジキのエラの中に戻る（45秒後）．その間，もう1個体はエラの入り口付近に定位していた．バショウカジキは，ヒシコバン2個体が完全にエラの中に戻るまで鰓ポンプ換水でゆっくりと遊泳し（44～47秒後），その後，ラム換水に切り替えて遊泳した（47～53秒後）．
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
