Order Stomiiformes Family Gonostomatidae(Bristlemouths) Slender fangjaw Sigmops gracilis(Günther, 1878). 13.3 cm SL Korean name/Sol-ni-ael-tung-i(솔니앨퉁이) Japanese name/Yoko-eso Chinese name/纖鑽光魚(섬찬광어) D/spines 0, soft rays 10-14. A/spines 0, soft rays 26-30. P1/9-10. P2/7-8 vertebrae/40-42
Distribution; Pacific Ocean/widely distributed in subarctic to subtropical waters, mainly west of 143°W and north of 15°N. Most abundant in the northwest Pacific between the southern Kuril Islands and Taiwan. South China Sea and East China Sea. General;This fish was identified as a Korean unrecorded species by analyzing the fish collected at a depth of 100m at Jeju Island in 2012 and was proposed Korean name as Sol-ni-ael-tung-i(Pukyong National University Kim Jin-gu, Lee Soo-jung) Mesopelagic, nonmigratory at 200-1000 m. Migrates towards surface at night. Larvae and juveniles in upper 200 m. A row of widely separated photophores near ventral profile of body. Body moderately compressed and elongate. Head moderate and eyes round. Eye diameter longer than the snout length. The adult’s lateral view of body side including the head is shaped like a baseball bat. Mouth very large with hooked teeth, with the posterior tip of the upper jaw reaching to the posterior border of the eye. Dorsal origin above 4th to 5th anal ray. Anal fin base length much longer than the dorsal fin. Pelvic and pectoral fins small. Anus not attached to anal fin base, but very close to it. It is assumed that the body color of adult is blackish overall.
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