Abstract
Eelpout species of the genus Lycenchelys Gill, 1884 recorded from Japanese waters are taxonomically revised. This study recognizes the following 11 species from Japanese waters as valid: Lycenchelys albomaculata Toyoshima, 1983, Lycenchelys aurantiaca Shinohara & Matsuura, 1998, Lycenchelys hippopotamus Schmidt, 1950, Lycenchelys maculata Toyoshima, 1985, Lycenchelys makushok Fedorov & Andriashev, 1993, Lycenchelys melanostomias Toyoshima, 1983, Lycenchelys rassi Andriashev, 1955, Lycenchelys remissaria Fedorov, 1995, Lycenchelys ryukyuensis Shinohara & Anderson, 2007, Lycenchelys squamosa Toyoshima, 1983 and Lycenchelys tohokuensis Anderson & Imamura, 2002. We redescribe species in detail based on type specimens as well as additional specimens in many cases. The synonymy of Lycenchelys brevimaxillaris Toyoshima, 1985 with L. melanostomias is supported in this study. Sexual dimorphism and changes with growth are revealed in L. albomaculata, L. aurantiaca, L. hippopotamus, L. makushok, L. melanostomias and L. rassi, all based on 10 or more specimens, for relative head length, head width, and upper and lower jaw lengths. In addition, we also found that the sizes at which sexual dimorphism can be recognized, and the tendencies for change with growth, differ among species. Furthermore, the dimorphism in head length is influenced by the snout length, eye diameter and/or postorbital length in L. albomaculata and L. aurantiaca.
References
Amaoka, K., Nakaya, K. & Yabe, M. (1995) The fishes of northern Japan. Kita-Nihon Kaiyo Center, Sapporo, 391 pp. [in Japanese]
Amaoka, K., Nakaya, K. & Yabe, M. (2011) Fishes of Hokkaido. The Hokkaido Shimbun Press, Sapporo, 482 pp. [in Japanese]
Anderson, M.E. (1982a) A new eelpout (Teleostei: Zoarcidae) from the eastern tropical Pacific Ocean. Bulletin of Marine Science, 32 (1), 207–212.
Anderson, M.E. (1982b) Revision of the fish genera Gymnelus Reinhardt and Gymnelopsis Soldatov (Zoarcidae), with two new species and comparative osteology of Gymnelus viridis. National Museum of Natural History, Publications in Zoology, 17, 1–76.
Anderson, M.E. (1988) Studies on the Zoarcidae (Teleostei: Perciformes) of the southern hemisphere. I. The Antarctic and subantarctic regions. Antarctic Research Series, 47, 59–113.
https://doi.org/10.1029/AR047p0059
Anderson, M.E. (1991) Studies on the Zoarcidae (Teleostei: Perciformes) of the souththern hemisphere. V. Two new species from the Weddell Sea, Antarctica. Cybium, 15, 151–158.
Anderson, M.E. (1994) Systematics and osteology of the Zoarcidae (Teleostei: Perciformes). Ichthyological Bulletin of the J.L.B. Smith Institute of Ichthyology, 60, 1–120.
Anderson, M.E. (1995) The eelpout genera Lycenchelys Gill and Taranetzella Andriashev (Teleostei: Zoarcidae) in the eastern Pacific, with descriptions of nine new species. Proceedings of the California Academy of Science, 49, 55–133.
Anderson, M.E. (2006) Studies on the Zoarcidae (Teleostei: Perciformes) of the southern hemisphere. XII. Two new lycodine species from off Peru. Species Diversity, 11, 183–190.
https://doi.org/10.12782/specdiv.11.183
Anderson, M.E. & Balanov, A.A. (2000) Lycenchelys fedorovi: a new species of eelpout (Teleostei: Zoarcidae) from the northern Pacific Ocean. Copeia, 2000, 1056–1061.
https://doi.org/10.1643/0045-8511(2000)000[1056:LFANSO]2.0.CO;2
Anderson, M.E. & Fedorov, V.V. (2004) Family Zoarcidae Swainson, 1839 eelpouts. California Academy of Sciences, Annotated Checklists of Fishes, 34, 1–58.
Anderson, M.E. & Imamura, H. (2002) A new species of Lycenchelys (Perciformes: Zoarcidae) from the Pacific coast of northern Japan. Ichthyological Research, 49, 355–357.
https://doi.org/10.1007/s102280200053
Anderson, M.E. & Møller, P.R. (2007) Studies on the Zoarcidae (Teleostei: Perciformes) of the southern hemisphere. XIII. Two new species of Lycenchelys from the Southwestern Pacific. Species Diversity, 12, 175–185.
https://doi.org/10.12782/specdiv.12.175
Andriashev, A.P. (1955) A review of the fishes of the genus Lycenchelys Gill (Pisces, Zoarcidae) and related forms in the seas of the USSR and adjacent waters. Trudy Instituta Zoologii Akademia Nauk, Azerbaidzhanskoi SSR, 18, 349–384. [Translated from Russian in Selected taxonomic papers on northern marine fishes, OTS 61-31030]
Andriashev, A.P. (1958) An addition to the review of the fishes of the genus Lycenchelys Gill with descriptions of three new species from the Kuril-Kamchatka Trench. Voprosy Ikhtiologii, 8, 611–618. [Translated from Russian in Selected taxonomic papers on northern marine fishes, OTS 61-31030]
Andriashev, A.P. (1979) First finding of fishes of the families Zoarcidae and Liparididae near Kerguelen Islands. Biologiya Morya, 6, 28–34. [in Russian]
Andriashev, A.P. (1980) On the deepest occurrence of a species of the fish family Zoarcidae Lycenchelys atacamensis sp. n. from the Atacama Trench. Zoologicheskii Zhurnal, 59, 1105–1108. [in Russian with English summary]
Balushkin, A.V., Sheiko, B.A. & Fedorov, V.V. (2011) Catalog of archival collection of the Zoological Institute, Russian Academy of Sciences: class Osteichthyes (bony fishes), order Perciformes, family Zoarcidae. Journal of Ichthyology, 51, 950–1034.
https://doi.org/10.1134/S0032945211100031
Evermann, B.W. & Goldsborough, E.L. (1907) The fish of Alaska. Bulletin of the Bureau of Fisheries, 26, 219–360.
https://doi.org/10.5962/bhl.title.60330
Fedorov, V.V. (1976) New data on the eel-like likods (Pisces, Zoarcidae) from the northwestern Pacific Ocean and Bering Sea. Izvestiya TINRO, 100, 3–18. [in Russian]
Fedorov, V.V. (1995a) Lycenchelys parini sp. nova (Perciformes: Zoarcidae) from the bathyal region of the Kuril-Kamchatka trench. Journal of Ichthyology, 35, 130–134.
Fedorov, V.V. (1995b) Lycenchelys remissaria sp. nova (Perciformes: Zoarcidae) from the bathyal region of the ocean shores of Japan. Journal of Ichthyology, 35, 135–139.
Fedorov, V.V. & Andriashev, A.P. (1993) Lycenchelys makushok sp. nova (Perciformes: Zoarcidae) from the bathyal depths of the Kuril-Kamchatka Trench. Journal of Ichthyology, 33, 130–135.
Gill, T.N. (1884) On the anacanthine fishes. Proceedings of the Academy of Natural Sciences of Philadelphia, 36, 167–183.
Gosztonyi, A.E. (1977) Results of the research cruises of FRV “Walter Herwig” to South America. XLVIII. Revision of the South American Zoarcidae (Osteichthyes, Blennioidei) with the description of three new genera and five new species. Archiv für Fischereiwissenshaft, 27, 191–249.
Hatooka, K. (1993) Zoarcidae. In: Nakabo, T. (Ed.), Fishes of Japan with pictorial keys to the species. Tokai University Press, Tokyo, pp. 898–913 + 1343–1345. [in Japanese]
Hatooka, K. (2000) Zoarcidae. In: Nakabo, T. (Ed.), Fishes of Japan with pictorial keys to the species. 2nd edition. Tokai University Press, Tokyo, pp. 1028–1044 + 1590–1593. [in Japanese]
Hatooka, K. (2002) Zoarcidae. In: Nakabo, T. (Ed.), Fishes of Japan with pictorial keys to the species, English edition. Tokai University Press, Tokyo, pp. 1028–1044 + 1581–1583.
Hatooka, K. (2013) Zoarcidae. In: Nakabo, T. (Ed.), Fishes of Japan with pictorial keys to the species. 3rd edition. Tokai University Press, Hadano, pp. 1220–1237 + 2076–2082. [in Japanese]
Imamura, H. (1997) Perciform fish fauna from off Pacific of Tohoku. Researches on Basic Fishes in Tohoku District, 17, 55–68. [in Japanese]
Imamura, H. (1998) Zoarcid fishes occurring off Pacific of Tohoku District. Researches on Basic Fishes in Tohoku District, 18, 28–34. [in Japanese]
Imamura, H., Machida, Y. & Ohta, S. (2004) Lycenchelys melanostomias Toyoshima, 1983, a senior synonym of L. brevimaxillaris Toyoshima, 1985 (Teleostei: Zoarcidae). Ichthyological Research, 51, 84–88.
https://doi.org/10.1007/s10228-003-0194-2
Imamura, H., Shinohara, G. & Shiogaki, M. (2005) Rediscovery of the type specimens of Lycenchelys brevimaxillaris (Actinopterygii: Perciformes: Zoarcidae) with taxonomic notes on the species. Species Diversity, 10, 1–6.
https://doi.org/10.12782/specdiv.10.1
Jensen, A.S. (1904) The North-European and Greenland Lycodinae. The Danish Ingolf-Expedition, 2 (4), 1–99.
https://doi.org/10.5962/bhl.title.12206
Jordan, D.S. & Evermann, B.W. (1898) The fishes of North and Middle America: A descriptive catalogue of the species of fish-like vertebrates found in the waters of North America north of the Isthmus of Panama. Bulletin of the United States National Museum, 47, 2183–3136.
https://doi.org/10.5962/bhl.title.39716
Kitagawa, D., Imamura, H., Goto, T., Ishito, Y., Fujiwara, K. & Ueda, Y. (2008) Field guide of the fishes from the Tohoku District, north-eastern waters of Japan. Tokai University Press, Hadano, 141 pp. [in Japanese]
Koyanagi, M. (1995) Zoarcidae. In: Okamura, O., Amaoka, K., Takeda, M., Yano, K., Okada, K. & Chikuni, S. (Eds.), Fishes collected by the R/V Shinkai Maru around Greenland. Japan Marine Fishery Resources Research Center, Tokyo, pp. 188–193 + 204–206.
Koyanagi, M. (1997) Zoarcidae. In: Okamura, O. & Amaoka, K. (Eds.), Sea fishes of Japan, Yama-Kei, Tokyo, pp. 536–538. [in Japanese]
Matsubara, K. (1955) Fish morphology and hierarchy. Ishizaki-Shoten, Tokyo, 1605 pp. [in Japanese]
Mecklenburg, G.W., Mecklenburg, T.A. & Thorsteinson, L.K. (2002) Fishes of Alaska. American Fisheries Society, Bethesda, xxxvii + 1037 pp.
Nakabo, T. & Hirashima, Y. (2015) Scientific names of Japanese fishes: etymology. Tokai University Press, Hadano, xv + 372 pp. [in Japanese]
Nakamura, I. (1986) Zoarcidae. In: Nakamura, I., Inada, T., Takeda, M. & Hatanaka, H. (Eds.), Important fishes trawled off Patagonia. Japan Marine Fishery Resources Research Center, Tokyo, pp. 232–243.
Nelson, J.S., Grande, T.C. & Wilson, M.V. (2016) Fishes of the world, 5th edition. John Wiley and Sons, New York, xli + 707 pp.
https://doi.org/10.1002/9781119174844
Peden, A.E. (1973) Records of eelpouts of the genus Lycenchelys and Embryx from the northeastern Pacific Ocean. Syesis, 6, 115–120.
Peden, A.E. & Anderson, M.E. (1978) A review of the fish genus Lycodapus (Zoarcidae) with description of two new species. Canadian Journal of Zoology, 56, 1925–1961.
https://doi.org/10.1139/z78-262
Schmidt, P.Y. (1935) The Sea of Okhotsk and its fish fauna. Vestnik Akademii Nauk USSR, 5, 30–38. [in Russian]
https://doi.org/10.2307/1436107
Schmidt, P.Y. (1950) Fishes of the Sea of Okhotsk. Transaction of the Pacific Committee of the Academy of Science of the U.S.S.R., 6, 1–370. [in Russian]
Shinohara, G. & Anderson, M.E. (2007) Lycenchelys ryukyuensis sp. nov. (Perciformes: Zoarcidae) from the Okinawa Trough, Japan. Bulletin of the National Museum of Nature and Science, Series A (Zoology), Supplement 1, 59–66.
Shinohara, G. & Matsuura, K. (1998) A new zoarcid, Lycenchelys aurantiaca, from the Pacific coast off northern Japan (Teleostei: Perciformes). Ichthyological Research, 45, 151–155.
https://doi.org/10.1007/BF02678557
Shinohara, G. & Sakurai, H. (2006) Ericandersonia sagamia, a new genus and species of deep waters eelpouts (Perciformes: Zoarcidae) from Japan. Ichthyological Research, 53, 172–178.
https://doi.org/10.1007/s10228-006-0333-7
Shinohara, G., Endo, H. & Matsuura, K. (1996) Deep-water Fishes collection from the Pacific coast of northern Honshu, Japan. Memories of the National Science Museum, Tokyo, 29, 153–185.
Shinohara, G., Narimatsu, Y., Hattori, T., Ito, M., Takata, Y. & Matsuura, K. (2009) Annotated checklist of deep-sea fishes from the Pacific coast off Tohoku District, Japan. In: Fujita, T. (Ed.), Deep-sea fauna and pollutants off Pacific coast of northern Japan. National Science Museum of Nature and Science Monographs, Tokyo, 39, pp. 683–735.
Shiogaki, M. (1982) A catalogue of the fishes collected from the waters of Aomori Prefecture, Japan. Bulletin of the Fisheries Experimental Station of Aomori Prefecture, 1982, 1–36. [in Japanese]
Shiogaki, M., Ishito, Y., Nomura, Y. & Sugimoto, T. (2004) Revised catalog of the fishes collected from the waters of Aomori Prefecture. Bulletin of Aomori Prefectural Fisheries Research Center, (4), 39–80. [in Japanese with English abstract]
Taranetz, A.J. (1937) Hand book for identification of fishes of the Soviet far east and adjacent waters. Bulletins of the Pacific Science Institute, 11, 1–200. [in Russian]
Thiel, R., Knebelsberger, T. & Eidus, I. (2018) Description and DNA barcoding of Lycenchelys lenzeni, a new species of eelpout (Perciformes: Zoarcidae) from the deep sea off the Kuril Archipelago. Zootaxa, 4370 (1), 45–56.
https://doi.org/10.11646/zootaxa.4370.1.3
Toyoshima, M. (1983) Zoarcidae. In: Amaoka, K., Nakaya, K., Araya, H. & Yasui, T. (Eds.), Fishes from the north-eastern Sea of Japan and the Okhotsk Sea off Hokkaido. The intensive research of unexploited fishery resources on continental slopes. Japan Fisheries Resource Conservation Association, Tokyo, pp. 136–149 + 208–210 + 258–277 + 329–335.
Toyoshima, M. (1984) Family Zoarcidae. Eelpouts. In: Masuda, H., Amaoka, K., Araga, C., Uyeno, T. & Yoshino, T. (Eds.), The Fishes of the Japanese Archipelago. Tokai University Press, Tokyo, pp. 291–295. [in Japanese]
Toyoshima, M. (1985) Taxonomy of the subfamily Lycodinae (family Zoarcidae) in Japan and adjacent waters. Memoirs of the Faculty of Fisheries, Hokkaido University, 32, 131–243.
Vaillant, L. (1888) Expéditions scientifiques du “Travailleur” et du “Talisman” pendant les années 1880, 1881, 1882, 1883. Masson, Paris, 406 pp.
https://doi.org/10.5962/bhl.title.13677
Yamanaka, T. & Ito, K. (2014) Additional records and revisions to the revised catalog of the fishes collected from the waters of Aomori Prefecture-I. Bulletin of Aomori Prefectural Industrial Technology Research Center Fisheries Institute, 8, 1–10. [in Japanese]
Zama, A. (2001) Fish fauna of Miyagi Prefecture, Japan. Sanwa Publisher, Ishinomaki, 153 pp. [in Japanese]