Order Myctophiformes(lanternfishes). Family Myctophidae(Lanternfishes) Pearly lanternfish Myctophum nitidulum(Garman, 1899). 10 cm TL Korean name/sed-bi-neul-chi(샛비늘치) Japanese name/ススキハダカ(Susuki-hadaka) Chinese name/閃光燈籠魚(섬광등롱어) Russian name/Блистающий миктоф(Blistayushchiy miktof/반짝이는 믹토프) D/spines 0, soft rays 12~14. A/spines 0, soft rays 18~21. P1/13~16. Vertebrae/36~39. Branchiostegal rays/9~10
Distribution; Circumglobal in all tropical and subtropical waters. Indo-Pacific/South Sea of Korea, south of Hokkaido Japan, Taiwan, South China Sea and East China Sea, eastern Australia, and the eastern Pacific. Western Atlantic/Canada to Brazil, including Gulf of Mexico. East Atlantic/Mauritania and South Africa. General; Genus Myctophum coprises 16 species in which 2 species distribute in Korea; Myctophum asperum and Myctophum nitidulum. Body relatively slender; body depth less than 27% standard length. Compressed body, Head and anterior body big tapering slender. 1 dorsal fin present that placed on mid dorsal point of body. An adipose fin behind the dorsal fin. Snout short and rounded. With big eye, of which diameter is more than twice of snout length. With deciduous ctenoid scales. Uppermost part of opercle acute. Photophores scattered in behind operculum, around pectoral fin, body side, and abdomen; photophores on abdomen are aligned in line. Max length 10cm, blackish brown in body color(but uncertain). This species is oceanic, mesopelagic and performs diel migrations from as deep as 475-850 m(max; 1537m) during the day, up to the surface to 0~125 m during the night for feeding purposes. Oviparous, with planktonic eggs and larvae. Females reach sexual maturity at 4.8 cm, males at 3.5 cm.
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