Branchiostegal Rays 7; Retia Mi- Rabilia and Gas Glands 2

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Branchiostegal Rays 7; Retia Mi- Rabilia and Gas Glands 2 Japanese Journal of Ichthyology 魚 類 学 雑 誌 Vol.39, No.3 1992 39巻3号1992年 A Rare Macrourid Alevin of the Genus first arch 0+7/0+8; branchiostegal rays 7; retia mi- Hymenocephalus from the Pacific Ocean rabilia and gas glands 2; abdominal vertebrae 12. Measurements in mm: body depth 3.88; predorsal Hiromitsu Endo, Mamoru Yabe and Kunio Amaoka 4.30; preanal 5.48; first dorsal fin base 1.58; long- itudinal length of light organ 2.34. Laboratory of Marine Zoology, Faculty of Fisheries, Hokkaido University, 3-1-1 Minato-cho, Head and body compressed. Head partly dam- Hakodate 041, Japan aged, both eyes lost. Pectoral fin stalked and discoid in shape. Pelvic fin well developed. Presence of serra- tions on second spine of first dorsal fin uncertain During the midwater trawl survey of the T/V because of loss of spine. Anal fin rays much longer Oshoro-Maru of Hokkaido University, a rare macro- than second dorsal rays. First gill slit restricted. Gill urid larva was collected at 0-400m depth in the rakers differentiated and tubercle in shape. Mouth southeast of the Ryukyu Islands in November 1988. oblique. Premaxilla provided laterally with a band of The larva has a discoid pectoral fin with long, stalked needle-like teeth (Fig. 2). Mandibular dentition com- base, a feature that identifies it as a macrourid alevin posed of one row of small, widely spaced, conical (Merrett, 1989). The structure of the light organ and teeth. Small mental barbel differentiated. Light organ the presence of seven branchiostegal rays further on abdomen having two rounded lens-like bodies identifies the specimen as a species of Hymenocepha- connected by a secondary duct; large anterior lens lus. immediately before a line through pelvic fin bases, Information on the early life history of Pacific small posterior lens just before anus (Fig. 2). Anus Ocean macrourids is available for only four species just before anal fin origin. Vertebrae ossified. of two genera, Coryphaenoides and Mesobius (Gil- Pelvic fin bases, light organ and abdominal region bert and Burke, 1912; Hubbs and Iwamoto, 1977; heavily pigmented. Some melanophores present on Stein, 1980). In this paper, we report the first discov- first dorsal fin base and area from thorax to isthmus. ery from the Pacific Ocean of an alevin of Hymeno- Leucophores widely scattered on head, thorax and cephalus. anterior lens of light organ. No striations on under- The specimen was fixed and preserved in 5% side of body. buffered formalin, and is deposited in the larval Remarks. The discoid pectoral fin with elongate collection of the Laboratory of Marine Zoology, peduncle of the present larva is a distinctive charac- Faculty of Fisheries, Hokkaido University ter of the macrourid alevin period (Merrett, 1989). (HUMZ-L). Methods for taking meristic and mor- Our Ryukyu Islands alevin has macrourine charac- phological data follow Stein (1980) and Merrett ters (e.g., restricted first gill slit and well-developed (1989). Terminology for life history stages follows anal fin), and the following features are diagnostic Merrett (1989). for the genus Hymenocephalus: branchiostegal rays 7; light organ having two lens-like bodies connected by a secondary duct; anus situated immediately be- Hymenocephalus sp. fore anal fin origin; retia mirabilia and gas glands 2. (Figs. 1, 2) Among the genus Hymenocephalus, which com- Material examined. HUMZ-L 5220, 3.59mm in head prises 18 nominal species, 9 species possibly occur length (HL), 20.5mm in total length (TL), 24•‹17.0'N, from Japan to the Philippines (Iwamoto, 1990). 131•‹45.8'E, 0-400m depth, beam trawl on November 17, Based on adult characters from our comparative 1988. material and from the literature (Smith and Comparative adult material. Hymenocephalus aterrimus: Radcliffe, 1912; Gilbert and Hubbs, 1917, 1920; Oka- HUMZ 107628 (1 specimen, 35mm HL, 156+mm TL); mura 1970a, b; Iwamoto, 1990), the present alevin H. gracilis: HUMZ 35803 (1,40mm HL, 169+mm TL); agrees with H. gracilis Gilbert et Hubbs, 1920 or H. H. kuronumai: HUMZ 36533 (1, 40mm HL, 169+mm kuronumai Kamohara, 1938 in having 8 pelvic fin TL); H. lethonemus: HUMZ 36038, 36225 (2, 18-19mm HL, 96-104+mm TL); H. longiceps: HUMZ 36629 (1, 24 rays, 12 abdominal vertebrae, a chin barbel and low mm HL, 107mm TL); H. striatissimus: HUMZ 36682, gill raker counts. 90357, 90358 (3, 20-23mm HL, 84-146+mm TL). In pigmentation, the pelvic fin bases are notably Description of alevin. Meristic counts: first black in both this alevin and adult H. gracilis, but dorsal fin rays II, 9; pelvic fin rays 8; gill rakers on slightly black in adult H. kuronumai. The number of ―265― 魚類学雑誌 Japan. J. Ichthyol. 39 (3), 1992 Fig. 1. Hymenocephalus sp., HUMZ-L 5220, 3.59mm HL, 20.5mm TL. serration feature, but unfortunately, this character was of no value in our specimen because of loss of the distal part of the second dorsal spine. Concerning the premaxillary dentition, the alevin showed a re- markable tooth band, which is not apparent in adult specimens of H. gracilis nor H. kuronumai. Hence, it may be considered a tentative character in the alevin period. In the early alevin period of the genus Hymenoce- phalus, completely formed pelvic fin rays and abdom- inal vertebrae are distinctive characters to help sepa- rate H. gracilis and H. kuronumai from the other species. The present specimen, therefore, can only be determined to genus level, as Hymenocephalus sp., presently. Early life history stages of two species of the genus Hymenocephalus have been recorded; H. italicus Gig- lioli, 1884 from the Mediterranean Sea by Sanzo (1933), and H. italicus and H. gracilis from the Atlantic Ocean by Merrett (1989). Accordingly, this is the third species of Hymenocephalus alevin record- ed and is the first Hymenocephalus alevin reported Fig. 2. Hymenocephalussp., HUMZ-L 5220, left from the Pacific Ocean. Merrett (1989) provided premaxillain lateral view (above); light organ in data, but not descriptions, on the development and abdominal view (below). AL, anterior lens of pigmentation patterns of alevins of H. gracilis and H. light organ; PL, posterior lens of light organ; italicus. Though the present alevin differs from SD, secondary duct. Scalebars indicate 1mm. Merrett's H. gracilis (4.5-5.0mm HL) in lacking conspicuous pigments on the head and anterior part anal pterygiophores located before the first haemal of the tail, it is uncertain whether the difference is spine is four in H. gracilis and five in H. kuronumai caused by specific variation or specific difference, or in the comparative materials. The alevin corresponds loss of pigments during preservation. with H. gracilis in having four pterygiophores. How- ever, the amount of intraspecific variation in this Acknowledgments character is presently uncertain. Merrett (1989) sug- gested that the serrated second spine of the first We are grateful to Mr. Nigel R. Merrett (BMNH) dorsal fin was developed during the alevin period in for reviewing the manuscript. Our thanks also go to species bearing this character as adult. Adult H. the Captain Kiyoshi Masuda and the crew of the T/V gracilis is easily distinguished from the other 8 spe- Oshoro-Maru, Hokkaido University, for their help in cies of Hymenocephalus in the study area by this collecting our material, and to Dr. Muneo Okiyama ―266― Endo et al.: A Rare Macrourid Alevin (ORIT) for assistance in obtaining literature. Sanzo, L. 1933. Macrouridae. Uova, larve e stadi giovanili di Teleostei. Fauna and Flora of the Bay of Napoli 38: 255-265. (In Italian; English translation, 1969, Jerusa- Literature Cited lem: Israel Program for Scientific Translations, 378pp.) Gilbert, C.H. and C.V. Burke. 1912 (1910). Fishes from Smith, H.M. and L. Radcliffe. 1912. In Radcliffe, L. De- Bering Sea and Kamchatka. Bull. U.S. Bureau Fish., 30: scriptions of a new family, two new genera, and twenty- 31-96. nine new species of anacanthine fishes from the Philip- Gilbert, C.H. and C.L. Hubbs. 1917.Description of Hy- pine Islands and contiguous waters. Proc. U.S. Natl. menocephalustenuis, a new macrouroid fish from the Mus. 43 (1924): 105-14C, pls 22-31. Hawaiian Islands. Proc. U.S. Natl. Mus., 54(2231): 173- Stein, D.L. 1980. Description and occurrence of macrourid 175. larvae and juveniles in the northeast Pacific Ocean off Gilbert, C.H. and C.L. Hubbs. 1920.The macrouroidfishes Oregon, U.S.A. Deep-sea Res., 27: 889-900. of the Philippine Islands and the East Indies. U.S. Natl. (Received July 24, 1992; accepted September 23, 1992) Mus. Bull., 100, 1(pt. 7): 369-588. Hubbs, C.L. and T. Iwamoto. 1977.A new genus (Meso- bius), and three new bathypelagicspecies of Macrouridae 太 平 洋 か ら 記 録 さ れ た ソ コ ダ ラ 科 ス ジ ダ ラ 属Hymeno- (Pisces, Gadiformes) from the Pacific Ocean. Proc. cephalusの 仔 魚 Calif. Acad. Sci., ser. 4, 41: 233-251. 遠 藤 広 光 ・矢 部 衛 ・尼 岡 邦 夫 Iwamoto, T. 1990. Macrouridae. Pages 90-317 in FAO species catalogue Vol.10. Gadiform fishesof the world 沖 縄 南 東 海域 の 水深0-400mで の ビー ム トロー ル 調 査 に よ り 1個 体(3.59mmHL,20.5mmTL)の ソ コ ダ ラ科仔 魚 が採 集 され (Order Gadiformes). An annotated and illustrated cata- た。 本標 本 は,ソ コ ダ ラ科 のAlevin期 に特 徴 的 な 有 柄 胸 鰭 を 備 logue of cods, hakes, grenadiers and other gadiform え,鰓 条 骨 数 が7で あ る こ と,2個 の レ ン ズを 備 え る 発 光器 を も fishes known to date.
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