Pseudo-spawning behavior by a subordinate male of Dascyllus reticulatus (36.6MB, 00:01:21) 撮影日：2016/09/13 撮影場所：Kuchierabu-jima Island
		種類 Dascyllus reticulatus キーワード damselfish pseudo spawning
	Rei Sakanoue 2025/08/24登録

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動物界 >脊索動物門 >条鰭綱 >スズキ目 >スズメダイ科 >ミスジリュウキュウスズメダイ属 >

メスとのペア産卵が終了した直後に観察された，縄張りオスと独身オスによる偽ペア産卵行動．縄張りオスの求愛行動に応じて独身オスは巣に侵入し（0: 01），まるでメスのように体を震わせながら腹部を巣に擦り付けている（0: 02）．縄張りオスは独身オスを受け入れ，腹部を優しく口で刺激する様子が見られる（0: 10）．数秒後，縄張りオスは偽ペア産卵行動を止め，独身オスを攻撃して巣から追い出したが（0: 28），縄張りオスは独身オスに対して求愛行動を再開し（0:50），偽ペア産卵行動を繰り返した（1:08）．

Below is the abstract from the article containing this video:

Subordinate males in various animal groups often exhibit female mimicry as an alternative tactic. However, direct evidence of female mimicry behaviors in pomacentrids, an excellent model for studying the diversity of mating tactics in teleost under natural conditions, remains scarce. Here, we report female-mimicking behaviors in the sexually monochromatic coral- dwelling damselfish Dascyllus reticulatus, where subordinate males perform pair-spawning behaviors in the female role with dominant territorial males. These subordinate males also displayed nest-previewing behavior in mating nests a few days before pseudo-spawning, closely resembling the reproductive sequences of the females. Although subordinate males stably cohabited with the territorial male, one subordinate male suffered severe attacks from the dominant male immediately after pseudo-spawning, implying sperm release at the nest. As the territorial dominant males of D. reticulatus prioritized inducing female spawning in the harem and often released sperm after the female spawned within their mating sequence, it was inferred that unfertilized eggs remained on the mating nest at the time of pseudo-spawning. Female-mimicking behaviors may provide subordinate males with tactical advantages, such as potentially gaining partial paternity of eggs in mating nests by deceiving territorial males. Digital video images related to the article are available at http://www.momo-p.com/showd etail-e.php?movieid=momo250804dr01a, http://www.momo-p.com/showdetail-e.php?movieid=momo250804dr02a, and http://www.momo-p.com/showdetail-e.php?movieid=momo250804dr03a.

Rei Sakanoue, and Yoichi Sakai (2025) Female‐mimicking spawning by subordinate males of the coral‐dwelling damselfish Dascyllus reticulatus—a possible sneaking tactic observed in wild groups. J. Ethol. 10.1007/s10164-025-00862-8

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