A marine fish belonging to the order Sticklebacks of the class Osteichthyes and the family Polytminae. It is found along the Pacific coast south of Iwate Prefecture, in the Sea of Japan from southern Hokkaido to Hyogo Prefecture, in the East China Sea, and in Taiwan. Its body is thin and tough, covered with rough scales. The front half of its head is thin and tubular, with a small mouth at the tip. The first dorsal fin has 4-7 spines, the second of which is particularly strong. The pelvic fin is located on the abdomen and consists of one spine and five soft rays. The upper half of its body is red, and the lower half is silvery white. It grows to a total length of 20 centimeters. It lives in schools near the sandy and muddy bottom at depths of less than 500 meters. It holds its body slightly upside down at an angle and eats zooplankton, crustaceans, and other small animals that live on the seabed. It spawns from January to February. Young fish live in the surface layer of the open ocean. It is caught with bottom trawls, but is not eaten. Due to its unusual body shape and ecology, it is exhibited at aquariums. The Japanese giant clownfish Macrorhamphosus japonicus , which is similar to this species, has a low body, a short second dorsal fin spine that does not extend beyond the rear end of the base of the second dorsal fin when held down, and the spine has no serrations on the rear edge, so it can be distinguished from the Japanese giant clownfish. However, some researchers consider these two species to be the same. Fossils similar to the Japanese giant clownfish have been known from the Late Cretaceous. [Akira Ochiai and Kunio Amano] © Underwater Fort Enterprise Isamu Soyama "> Sagihue (ecology) Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
硬骨魚綱トゲウオ目サギフエ科に属する海水魚。岩手県以南の太平洋沿岸、北海道南部から兵庫県までの日本海、東シナ海、台湾に分布する。体は薄くて堅く、粗雑な鱗(うろこ)で包まれる。頭部の前半部は細い管状となって、その先端に小さな口がある。第1背びれには4~7本の棘(とげ)があるが、そのうちの第2棘(きょく)はとくに強大である。腹びれは腹部にあり1棘5軟条よりなる。体は上半分が赤く、下半分は銀白色である。全長20センチメートルになる。500メートル以浅の砂泥底近くに群れで生息する。体をやや斜めに倒立して、海底にすむ動物プランクトン、甲殻類などの小動物を食べる。産卵期は1~2月。稚魚は外洋の表層にすむ。底引網で漁獲されるが、食用にしない。風変わりな体つきと生態から水族館で展示される。 本種と似たダイコクサギフエMacrorhamphosus japonicusは体が低く、第2背びれ棘が短くて、倒すと第2背びれ基底後端を越えないこと、この棘の後縁に鋸歯(きょし)がないことなどでサギフエと区別できる。しかしこれら2種を同種とする研究者もいる。サギフエに似た化石が後期白亜紀から知られている。 [落合 明・尼岡邦夫] ©水中フォート・エンタープライズ 楚山いさむ"> サギフエ(生態) 出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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