Egg concealment in ascidians by females of the Japanese tubesnout, Aulichthys japonicus (Gasterosteiformes), and its subsequent copulation
Egg concealment in ascidians by females of the Japanese tubesnout, Aulichthys japonicus (Gasterosteiformes), and its subsequent copulation
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DOI：
10.1007/s10228-007-0005-2
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发表时间：
2008-02-01
影响因子：
1.2
通讯作者：
Iwamoto, Toshitaka
中科院分区：
文献类型：
--
作者：
Akagawa, Izumi;Hara, Masako;Iwamoto, Toshitaka
在水族箱中观察了日本管鱼的繁殖行为，该鱼是腹形鱼类中唯一一种将卵隐藏在海囊中的鱼。参加海鞘活动的黄色雄性向怀孕的雌性求爱。婚礼的颜色可能是向雌性投放地点的广告，而求爱似乎促进了雌性产卵。雌性在海鞘上方产卵，并立即将它们的卵用嘴放入鳃周腔。雄性在产卵后从不射精，但试图在几分钟内与雌性交配，一个或几个具有显著婚礼颜色的雄性经常使用它们的泌尿生殖乳头交配。提出了一种独特的卵隐藏和随后交配的进化场景。
The reproductive behaviors of the Japanese tubesnout, Aulichthys japonicus, the only fish among gasterosteiform fish that conceals eggs in ascidians, were observed in aquaria. Yellow nuptial-colored males attending at ascidian courted gravid females. The nuptial color could be an advertisement to females for depositing sites, and courtships seemed to facilitate female spawning. The females spawned eggs above the ascidian and immediately placed their eggs with their mouths into the peribranchial cavity. Males never ejaculated on eggs after spawning, but attempted to copulate with females during a period of several minutes, and one or a few males with the remarkable nuptial color frequently copulated using their urogenital papilla. An evolutionary scenario of unique egg concealment and subsequent copulation is proposed.