Japanese Journal of Ichthyology 魚 類 学 雑 誌 Vol.23,No.41977 23巻4号1977年

First Record of the Neoscopelid Fish has 8 branchiostegal rays,and its vomer has Scopelengys tristis from Japan two oval patches of villiform teeth with the naked median line.It has no tooth patches Teruya Uyeno and Shuzo Kishida on the pterygoids. (Received November 18,1976) The dorsal fin has 11 rays(including a small A single specimen of Scopelengys tristis anterior one);the anal fin has 14 rays(including Alcock,1890 in the family Neoscopelidae of 2 small anterior ones);the pectoral fin has 14 the order Myctophiformes was collected off rays;the pelvic fin has 8 rays on both sides; the west coast of Kyushu Island.Japan,by the number of principal rays of the caudal fin the research vessel Kaiyo-maru,during the is 10+9=19.Scales are lost and not countable. survey of the deepwater in the northeastern The first gill arches of both sides have 14 gill part of the East China Sea,This genus and rakers(4+1+9).The number of vertebrae species is hitherto unrecorded from adjacent is 31. waters around Japan. Measurements(in mm)of body parts and The fish was captured on February 13, their percentages in the standard length are 1975,in the net no.Till which was lowered as follows.The standard length 178mm.head into sea at 2:48pm at 30•‹38.4'N.128•‹41.2'E length 49.7(27.9%),body depth 41.6(23.4%). and taken out of water at 3:10 pm,at snout length 14.1(7.9%)upper jaw length 31•‹38.6'N,128•‹40.3'E.The net was operated 26,4(14.8%),eye diameter 6.6(3.7%),inter- at the depth of 660 m for the distance of about orbital width 9.4(5.3%),depth of caudal 1.8 km at the speed of 3.5 knot.The water peduncle 17.0(9.6%),tip of snout to origin temperature at the surface was 19.8•Ž.and of dorsal fin 71.0(39.9%).tip of snout to 6.18•Ž at the depth of 660m,The salt con- adipose fin 142,0(79.8%)tip of snout to centration was 42% at the depth, origin of anal fin 119,0(66,9%),tip of snout The fish was identified as Scopelengys tristis to insertion of pectoral fin 46.0(25.8%),tip on the basis of following characters which of snout to insertion of pelvic fin 72.8(40.9%), agree with diagnosis of the species,and match length of pectoral fin 48.5(27.2%),length of well with descriptions of specimens by Alcock dorsal fin base 34.8(19.6%).length of anal (1890),Garman(1899),Miller(1947),and Butler fin base 36.8(20.7%). and Ahlstrom(1976). Scopelengys tristis has been known(Fig.2) The specimen has a large head and small from Arabian Sea(Alcock,1890;Norman, eyes as in Fig.1,and has no photophores. 1939;Kotthaus,1967),the eastern.Pacific The dorsal fin originates above the insertion from Santa Barbara,California to mid-Chile of the pelvic fin.The adipose fin is located (Garman,1899 as S.disper;Mead.1963: above the posterior end of the anal fin.The Berry and Perkins.1967;Bussing.1965: width of the posterior end of the maxillary Brawer,1973;Brown,1974;Fitch and Laven- is greater than the diameter of the eye.It berg,1968),North of Madeira in the Atlantic

Fig.1.A specimen of Scopelengys tristis Alcock taken off the western coast of Kyushu,Japan. Far Seas Fisheries Research.Laboratory L948:female,178 mm in standard length .

―239― 魚 類 学 雑 誌Japan.J.Ichthyol.23(4),1977

Fig.2.Recorded localities for Scopelengys tristis.

Ocean(Nielsen,1973),Java Trench off literature for the distribution of Scopelengys Indonesia(Mead,1963),and now from Japan. tristis. Addition to these,Butler and Ahlstrom(1976) Literature cited plotted following areas on their distribution map:Indian Ocean,Atlantic Ocean,eastern Alcock, A. W. 1890. Natural history notes from and middle Pacific Ocean,the Philippines,and H. M. Indian Marine survey steamer Investi- Indonesia.They also described the second gator, Commander R. F. Hoskyn, R. N., com- manding-No.18. On the bathybial fishes of species for the genus,Scopelengys clarki,from the Arabian Sea, obtained during the season the central Pacific. 1889-90. Ann. Mag. Nat. Hist., ser., 6, 6: 295•` With the addition of this species,following 311. 4 species of the family Neoscopelidae are now Berry, F. H. and H. C. Perkins. 1967. Survey known to be distributed around Japan. of pelagic fishes of the California Current area. Neoscopelus macrolepidotus Johnson,1863 Fish. Bull., U. S. Fish. Wildlife Service, 65 "sotooriiwashi" (3): 625•`682, figs. 1•`30. Neoscopelus microchir Matsubara,1943 Brewer, G. D. 1903. Midwater fishes from the "sangoiwashi" Gulf of California and the adjacent eastern tropical Pacific. Contribution in Science, Nat. Neoscopelus porosus Arai,1969 "shichigoiwashi" Hist. Mus. Los Angeles County, 242: 1•`47, figs. 1•`14. Scopelengys tristis Alcock,1890 "kurogoiwashi" Brown, D. W. 1974. Hydrography and midwater fishes of three contiguous oceanic areas off

Santa Barbara, California. Contribution in Acknowledgments Science, Nat. Hist. Mus. Los Angeles County, We are grateful to Dr.Tetsuya Sato of the 261: 1•`30, figs. 1•`17. Far Sea Fisheries Research Laboratory,for Bolin, R. L. 1939. A review of the myctophid the arrangement for this study,and for the fishes of the Pacific coast of the United States and of lower California. Stanford Ichthyol. loan of the specimen.We are also thankful Bull., 1 (4): 89•`156, figs. 1•`29. to members of Seikai-ku Fisheries Research Bussing, W. A. 1965. Studies of the midwater Laboratory for many valuable assistances in fishes of the Peru-Chile trench. Biol. Antarctic

collecting the specimen.Dr.Richard H. Seas II. Antarctic Res. Ser., 5: 185•`227, figs.

Rosenblatt of Scripps Institution of Oceano- 1•`16. graphy,University of California kindly pro- Butler, J. L. and E. H. Ahlstrom. 1976. Review vided us additional information on a recent of the deep-sea fish genus Scopelengys (Neo-

―240― Uyeno and Kishida:First Record of Scopelengys from Japan

scopelidae) with a description of new species , UNESCO, Paris. Scopelengys clarkei, from the central Pacific. Norman, J. R. 1939. Fishes. The John Murray Fisher. Bull., 74 (1): 142•`150, 150, figs . 1•`5. Expedition 1933-34 . Sci. Rep., 7 (1). 1•`116, Fitch, J. E. and R. J. Lavenberg. 1968. Deep- figs. 1•`41. British Mus. (Nat. Hist .), London. water fishes of California. Univ . California (Uyeno:Nippon Luther Shingaku Daigaku, Press. 155 pp., 74 figs. Mitaka-shi, Tokyo 181; Kishida: Seikai Regional Garman, S. 1899. Reports on an exploration of Fisheries Research Laboratory, Kokubu-cho , the west coast of Mexico, Central and South Nagasaki-shi 850, Japan) America, and off the Galapagos Islands , in charge of Alexander Agassiz by the U . S. fish 日本 初 記録 の ソ トオ リイワ シ 科魚 類 ク ロゴ イ ワ シ commission steamer"Albatros", during 1891 . (新称)に つ い て The fishes. Mem. Mus. Comp . Zool. Harvard 上 野 輝 弥 ・岸 田 周 三 Coll., 24: 1•`431, pls. 1•`97. Kotthaus, A. 1967. Fische des Indischen Ozeans . 水 産 庁 調 査 船 開 洋 丸 が1975年2 .月13日 九 州 西 Ergebnisse der ichthyologischen Untersuchun- 方 海 域 に て 採 集 し た 深 海 性 魚 類 の 中 に 日本 な ら び に gen wahrend der Expedition des Forschungs- 北 太 平 洋 西 部 か ら未 記 録 の ハ ダ カ イ ワ シ 目 ソ トオ リ schiffes"Meteor" in den Indischen Ozean, イ ワ シ 料Necoscopelidaeの ク ロ ゴ イ ワ シ(新 称) Oktober 1964 bis Mai 1965. A . Systematischer Scopelengys tristis Alcock,1890が1尾 含 ま れ て Teil II. Ordnung Iniomi: 71•`84, figs. 95•`96. い た.標 本 の 標 準 体 長 は178mmで 雌 で あ る 。 ク Gebruder Borntraeger. Berlin-Nikolassee . ロ ゴ イ ワ シ は ソ トオ リイ ワ シ 科 のSolivomerに 近 Mead, G. W. 1963. Observation of fishes caught 縁 で,発 光 器 が な く体 色 は 黒 い(新 和 名 は 黒 衣 に 由 over the anoxic waters of the Cariaco trench, 来 す る).口 は 大 き く 眼 は 小 さ い.脂 鰭 は 臀 鰭 の 後 端 Venezuela. Deep-sea Res. and Oceaogr. 上 方 に 位 置 す る.歯 は 絨 毛 状 で 鋤 骨 歯 群 は 左 右 に 分 Abstracts, 10: 251•`257, fig. 1. Pergamon Press. 離 し て い る.鰓 条 骨 数 は8本 で あ る.ク ロ ゴ イ ワ シ Miller, R. R. 1947. A new genus and species は イ ン ド洋,太 平 洋 な ら び に 大 西 洋 か ら 報 告 され て of deep-sea fish of the family Myctophidae お り,世 界 の 暖 ～ 熱 帯 の 深 海 に 棲 息 す る こ と が 知 ら from the Philippine Islands. Proc . U. S. Nat. れ て い る.本 種 を加 え る と 日 本 産 ソ トオ リ イ ワ シ 科 Mus., 97 (3211): 81•`90, figs. 1•`2. 魚 類 は ソ トオ リ イ ワ シ,サ ン ゴ イ ワ シ,シ チ ゴ イ ワ Nielsen, J. 1973. Neosccpelidae . Check-list of シ,ク ロ ゴ イ ワ シ の4種 と な る . the fishes of the north-eastern Atlantic and of (181三 鷹 市 大 沢3丁 目 日本 ル ー テ ール 神 学 大 学; the Mediterranean. CLOFNAM I: 170 . 850長 崎 市 国 分 町49水 産 庁 西 海 区 水 産 研 究 所)

―241―