Bristlemouth - Bristlemouth

Japanese: ヨコエソ - よこえそ（英語表記）bristlemouth

A deep-sea fish of the family Acanthodidae in the order Anserinidae (illustration). The body is long and slender and laterally compressed, becoming even thinner towards the rear. It has a huge mouth equipped with sharp teeth. The mouth slit reaches about 4/5 of the head length. There are rows of light-emitting organs along the ventral surface, underside of the sides and dorsal edge of the body. Light-emitting tissue larger than the lateral light organs is found on the ventral surface just in front of the eyes and at the rear end of the caudal peduncle. The dorsal fin is small and located slightly behind the center of the body. The anal fin begins in the center of the body. The pelvic fins are located slightly in front of the center of the body. They are known to change sex; after hatching, they grow to 6-7 cm and mature as males, and from the following year they change sex to females and mature, participating in reproductive activities with males one year younger.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

ワニトカゲギス目ヨコエソ科の深海魚（イラスト）。体は細長く側扁し，後方にいくにつれてさらに細くなる。鋭い歯を備えた巨大な口をもつ。口裂は頭長の約4/5に達する。体の腹面，体側の下側および背縁に沿って発光器列がある。眼の直前と尾柄部後端の腹面に体側発光器より大きな発光組織がある。背びれは小さく体の中心よりやや後ろにある。しりびれは体の中心より始まる。腹びれは体の中心よりやや前にある。性転換を行うことが知られており，孵化（ふか）後成長して6～7cmに達すると雄として成熟し，翌年から雌に性転換して成熟し1年若い雄と生殖活動に参加する。

出典　株式会社平凡社世界大百科事典第２版について　情報

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