著者
小川 力也
出版者
日本魚類学会
雑誌
魚類學雜誌 (ISSN:00215090)
巻号頁・発行日
vol.55, no.2, pp.144-148, 2008-11-25
参考文献数
13
著者
狩野 賢司
出版者
The Ichthyological Society of Japan
雑誌
魚類學雜誌 (ISSN:00215090)
巻号頁・発行日
vol.42, no.2, pp.173-180, 1995-08-15
被引用文献数
1

クロソラスズメダイの雌が配偶者を選択するタイミングと雄の求愛ディスプレイの頻度変化を沖縄のサンゴ礁で調査した.本種は雌雄ともに縄張りを持ち, それらが集まってコロニーを形成する.雌は早朝に雄の縄張りで産卵し, 雄が孵化まで卵の保護を行う.雌が産卵する朝だけでなくその前日の早朝と夕刻にも, 多くの雄がその雌の縄張りを訪れ, 頻繁に求愛ディスプレイを行った.雌は産卵当日の朝に雄からディスプレイを受ける前に産卵を始めることが多く, これらの雌は産卵前日により多くのディスプレイを行った雄と産卵していた.これらの結果から, 本種の雌は主に産卵前日の求愛ディスプレイ頻度によって配偶者となる雄を選択していることが示唆された.一方, 産卵前日にあまり求愛を受けなかった雌は, 産卵開始時刻を遅らせて雄からディスプレイを受ける傾向があり, これに対応して, 雄は産卵前日ばかりでなく産卵が行なわれる朝にも頻繁に求愛していると考えられた.
著者
佐藤 行人 西田 睦
出版者
日本魚學振興會
雑誌
魚類學雜誌 (ISSN:00215090)
巻号頁・発行日
vol.56, no.2, pp.89-109, 2009-11 (Released:2011-03-28)
著者
松本 清二 岩田 勝哉
出版者
The Ichthyological Society of Japan
雑誌
魚類學雜誌 (ISSN:00215090)
巻号頁・発行日
vol.44, no.1, pp.35-41, 1997-05-26
被引用文献数
1

Paternal egg guarding and mouthbrooding of larvae and juveniles were observed in the swamp-eel, <I>Monopterus albus</I>. In aquaria, the male guarded and cared for eggs in the bubble nest floating inside a plastic tube (5 cm in dia-meter, 50 cm in length). It was suggested that spawning and fertilization occurred outside the nest tube, and that the male carried the fertilized eggs (ca. 4 mm in diameter) in his mouth and inserted them into the bubble mass. Until the hatching of larvae (7-8 days after spawning), the male frequently added fresh bubbles into the bubble mass. As soon as the larvae (18-21 mm in TL) hatched and emerged from the bubble nest, the male sucked them into his mouth. Fifty juveniles (32-37 mm in TL) and two yolk-sac larvae (22 mm in TL) were released from the mouth of a male collected from a natural habitat. Those juveniles were retrieved by the male, some of them voluntarily returning to the male's mouth. The mouthbrooding male frequently performed pumping behavior (i.e., inflating and deflating the buccopharyngeal cavity), thereby acquiring to take fresh air. Eggs removed from the bubble nest successfully hatched only when directly exposed to aeration. In addition, only about 40% of the hatched larvae survived more than 10 days when they were kept in well-aerated water without the male parent. These suggest that both the bubble nest and mouthbrooding are indispensable for successful development and survival of eggs and larvae in this species, which inhabits swamps and paddy fields.