First observation of larval oarfish, Regalecus russelii, from fertilized eggs through hatching, following artificial insemination in captivity.

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2020-04-08 eCollection Date: 2020-01-01 DOI:10.1186/s40851-020-00156-6

Shin-Ichiro Oka, Masaru Nakamura, Ryo Nozu, Kei Miyamoto

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引用次数: 5

Abstract

Background: Little is known about the life history of oarfish of the genus Regalecus, although it is a famous deep-sea fish and an apparent origin of sea serpent legends. We successfully performed artificial insemination using a recently dead pair of sexually mature individuals. We report for the first time development from fertilized eggs to early larvae in the Lampridiformes.

Results: Eggs required 18 days of development from fertilization to hatching under 20.5-22.5 °C conditions. Oarfish larvae had similar morphological features as other lampridiform larvae hatched in the ocean. Larvae typically faced downward and swam using pectoral fins; they frequently opened their mouths. This mouth-opening behavior and swimming ability were both consistent with osteological development. The larvae did not eat and died four days after hatching.

Conclusions: This is the first successful instance of artificial insemination and hatching in the oarfish, as well as the first reliable morphological and behavioral description of lampridiform larvae.

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首次观察幼皇带鱼，皇带鱼，从受精卵到孵化，经过人工授精。

背景:尽管皇带鱼是一种著名的深海鱼类，并且是海蛇传说的明显起源，但人们对皇带鱼属的生活史知之甚少。我们成功地用一对刚刚死去的性成熟个体进行了人工授精。我们首次报道了Lampridiformes从受精卵到早期幼虫的发育过程。结果:在20.5 ~ 22.5℃条件下，卵从受精到孵化需18 d发育。皇带鱼幼体的形态特征与海洋中孵化的其他lampridiform幼体相似。幼虫通常面朝下，用胸鳍游泳;他们经常张大嘴巴。这种张嘴行为和游泳能力都与骨骼发育相一致。幼虫不进食，在孵化四天后死亡。结论:这是皇带鱼人工授精孵化的首例成功案例，也是第一次可靠的lampridiform幼虫形态和行为描述。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.

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