1. Genus Lethenteron Creaser and Hubbs

1. Lethenteron japonicum (Martens), Arctic lamprey, kawa-yatsume (anadromous): Hokkaido, Sakhalin, Iturup, Kamchatka (Taranetz, 1937; Berg, 1948; Schmidt, 1950; Lindberg and Krasukova, 1969; Nikoforov et al., 1989, 1994; Reshetnikov et al., 1997; Iwata, 2000).





2. Lethenteron kessleri (Anikin), Siberian lamprey, shiberia-yatsume (freshwater): Hokkaido, Iturup, Kunashir southern Sakhalin (Berg, 1948; Schmidt, 1950; Iwata, 1990a; Nikoforov et al., 1994; Reshetnikov et al., 1997).

2. Genus Acipenser Linnaeus

3. Acipenser medirostris Ayres, green sturgeon, chôzame (anadromous): Hokkaido, Sakhalin (Taranetz, 1937; Berg, 1948; Schmidt, 1950; Nikoforov et al., 1994; Reshetnikov et al., 1997; Amaoka, 2000a).

3. Genus Clupea Linnaeus

4. Clupea pallasii Valenciennes, Pacific herring, nishin (marine, but often entering mouths of rivers; lacustrine forms are also known): Hokkaido, Sakhalin, Kamchatka (Nikoforov et al., 1994; Reshetnikov et al., 1997; Sato, 2000).

4. Genus Anguilla Schrank

5. Anguilla japonica Temminck and Schlegel, Japanese eel, unagi (catadromous): Hokkaido (Tabeta, 1990).

5. Genus Brachymystax Günther

6. Brachymystax lenok (Pallas), lenok (freshwater): northwestern Sakhalin (Taranetz, 1937; Nikoforov et al., 1989).

6. Genus Hucho Günther

7. Hucho perryi (Brevoort), Sakhalin taimen, itô (anadromous, freshwater): Hokkaido, Sakhalin, southern Kuril Islands (Taranetz, 1937; Berg, 1948; Kimura, 1966; Nikoforov et al., 1989, 1994; Kawamura, 1990; Reshetnikov et al., 1997).

7. Genus Oncorhynchus Suckley

8. Oncorhynchus gorbuscha (Walbaum), pink salmon, karafutomasu (anadromous): everywhere, including Hokkaido, Sakhalin, Shumshu, Urup, Iturup, Kunashir, Shikotan, and Kamchatka (Taranetz, 1937; Berg, 1948; Schmidt, 1950; Lindberg and Legeza, 1965; Nikoforov et al., 1989, 1994; Reshetnikov et al., 1997; Ida, 2000).





9. Oncorhynchus keta (Walbaum), chum (dog) salmon, sake, shiro-zake (anadromous): everywhere, including Hokkaido, Sakhalin, Paramushir, Urup, Iturup, Kunashir, Shikotan, and Kamchatka (Taranetz, 1937; Berg, 1948; Schmidt, 1950; Lindberg and Legeza, 1959; Nikoforov et al., 1989, 1994; Reshetnikov et al., 1997; Ida, 2000).





10. Oncorhynchus kisutch (Walbaum), coho (silver) salmon, gin-zake (anadromous): Hokkaido, Sakhalin (Tym River), Shumshu, Paramushir, Urup, Iturup, Kunashir, Kamchatka (Taranetz, 1937; Berg, 1948; Lindberg and Legeza, 1965; Nikoforov et al., 1994; Reshetnikov et al., 1997; Ida, 2000).





11. Oncorhynchus masou masou (Brevoort), cherry (masu) salmon, sakura-masu (anadromous, and land-locked in freshwater): Hokkaido, Sakhalin, Kunashir, western Kamchatka (Taranetz, 1937; Berg, 1948; Lindberg and Legeza, 1965; Nikoforov et al., 1989, 1994; Reshetnikov et al., 1997; Ida, 2000).





12. Oncorhynchus mykiss (Walbaum), rainbow trout, Kamchatka steelhead, niji-masu (anadromous, and land-locked in freshwater): northern Kuril Islands (?), Kamchatka (Berg, 1948; Reshetnikov et al., 1997; Ida, 2000).





13 Oncorhynchus nerka (Walbaum), sockeye salmon, beni-zake (anadromous, and land-locked in freshwater): Hokkaido, Sakhalin (rivers Slavnaya, Raidovaya, Gorelaya, Kurilka, and Kuibyshevka; lakes Krasivoye and Sopochnoye), Shumshu, Paramushir, Onekotan, Iturup, Kamchatka (Berg, 1948; Lindberg and Legeza, 1959; Ivankov, 1984; Nikoforov et al., 1994; Reshetnikov et al., 1997; Ida, 2000).





14. Oncorhynchus tshawytscha (Walbaum), king salmon, masunosuke (anadromous, and land-locked in freshwater): Hokkaido, Kamchatka (Reshetnikov et al., 1997; Ida, 2000).

8. Genus Salvelinus Richardson

15. Salvelinus leucomaenis (Pallas), East Siberian charr, ame-masu, kundscha (anadromous, freshwater): everywhere, including Hokkaido, Sakhalin, the Kuril Islands (Paramushir, Urup, Iturup, Kunashir, Shikotan, Tanfilyeva), and Kamchatka (Taranetz, 1937; Berg, 1948; Schmidt, 1950; Lindberg and Legeza, 1965; Nikoforov et al., 1989, 1994; Reshetnikov et al., 1997; Ida, 2000).





16. Salvelinus malma (Walbaum), Dolly Varden, oshorokoma (anadromous and freshwater): everywhere, including Hokkaido, Sakhalin, the Kuril Islands (Shumshu, Paramushir, Onekotan, Shiashkotan, Rasshua, Simushir, Urup, Iturup, Kunashir), and Kamchatka (Taranetz, 1937; Berg, 1948; Lindberg and Legeza, 1965; Nikoforov et al., 1989, 1994; Reshetnikov et al., 1997; Ida, 2000).

9. Genus Coregonus Linnaeus

17. Coregonus ussuriensis Berg, Ussuri whitefish (euryhaline): northwestern Sakhalin (Taranetz, 1937; Nikoforov et al., 1989).

10. Genus Thymallus Linck

18. Thymallus arcticus (Pallas), Arctic grayling (freshwater): Sakhalin, Kamchatka (Taranetz, 1937; Nikoforov et al., 1989; Reshetnikov et al., 1997).

11. Genus Hypomesus Gill

19. Hypomesus japonicus (Brevoort), Japanese smelt, chika (anadromous): Hokkaido, Sakhalin, Shikotan (Taranetz, 1937; Klukanov, 1966, 1970b, 1977; Saruwatari et al., 1997; Amaoka, 2000b).





20. Hypomesus nipponensis McAllister, wakasagi (anadromous): Hokkaido, Sakhalin, (Klukanov, 1970b; Nikoforov et al., 1989, 1994; Saruwatari et al., 1997; Amaoka, 2000b).





21. Hypomesus olidus (Pallas), pond smelt, ishikari-wakasagi (anadromous, and land-locked freshwater): Hokkaido, Sakhalin, northern Kuril Islands, Kamchatka (Berg, 1948; Klukanov, 1966, 1970b, 1977; Nikoforov et al., 1989, 1994; Ito, 1990; Reshetnikov et al., 1997; Saruwatari et al., 1997).

12. Genus Mallotus Cuvier

22. Mallotus villosus (Müller), Capelin, karafuto-shishamo (marine, but often entering brackish and freshwater): northern coast of Hokkaido, southeastern Sakhalin, Kamchatka (Berg, 1948; Lindberg and Legeza, 1965; Reshetnikov et al., 1997; Amaoka, 2000b).

13. Genus Osmerus Linnaeus

23. Osmerus mordax (Mitchill), rainbow smelt, kyûri-uo (anadromous): Hokkaido, Sakhalin, Kuril Islands, Kamchatka (Berg, 1948; Schmidt, 1950; Klukanov, 1970a; Nikoforov et al., 1989, 1994; Reshetnikov et al., 1997; Amaoka, 2000b).

14. Genus Salangichthys Bleeker

24. Salangichthys microdon (Bleeker), common icefish, shira-uo (marine, but often entering brackish and freshwater): Hokkaido, Sakhalin (Berg, 1948; Lindberg and Legeza, 1965; Reshetnikov et al., 1997; Kinoshita, 2000).

15. Genus Esox Linnaeus

25. Esox reichertii Dybowski, Amur pike (freshwater): Sakhalin (Nikoforov et al., 1989; Reshetnikov et al., 1997).

16. Genus Carassius Jarocki

26. Carassius auratus (Linnaeus), goldfish, kin-buna (freshwater): Hokkaido, Sakhalin, Kamchatka (Taranetz, 1937; Nikoforov et al., 1989, 1994; Taniguchi, 1990).

17. Genus Cyprinus Linnaeus

27. Cyprinus carpio Linnaeus, carp, koi (freshwater): Hokkaido, Sakhalin, Kamchatka (Taranetz, 1937; Nikoforov et al., 1989, 1994; Hosoya, 1990).

18. Genus Elopichthys Bleeker

28. Elopichthys bambusa (Richardson) (freshwater): Sakhalin (Reshetnikov et al., 1997).

19. Genus Gobio Cuvier

29. Gobio soldatovi Berg, Pacific gudgeon (freshwater): Sakhalin (Nikoforov et al., 1989; Reshetnikov et al., 1997).

20. Genus Hemibarbus Bleeker

30. Hemibarbus labeo (Pallas), Amur barbel, skin-carp (freshwater): Sakhalin (Reshetnikov et al., 1997).

21. Genus Leuciscus Cuvier

31. Leuciscus waleckii (Dybowski), Amur ide (freshwater): Sakhalin (Taranetz, 1937; Berg, 1949a; Nikoforov et al., 1989; Reshetnikov et al., 1997).

22. Genus Phoxinus Agassiz

32. Phoxinus lagowskii steindachneri Dybowski, Lagowski's minnow, abura-baya (freshwater): Sakhalin (Nikoforov et al., 1989; Itai, 1990).





33. Phoxinus percnurus sachalinensis (Pallas), lake minnow, yachi-ugui (freshwater): Hokkaido, Sakhalin (Taranetz, 1937; Berg, 1949a; Kluchareva, 1964; Nikoforov et al., 1989, 1994; Goto, 1990a; Reshetnikov et al., 1997).





34. Phoxinus phoxinus (Linnaeus), common minnow (freshwater): Sakhalin (Berg, 1949a; Nikoforov et al., 1989; Reshetnikov et al., 1997).

23. Genus Pseudaspius Dybowski

35. Pseudaspius leptocephalus (Pallas), flathead asp (freshwater): Sakhalin (Nikoforov et al., 1989).

24. Genus Rhodeus Agassiz

36. Rhodeus sericeus (Pallas), Amur bitterling (freshwater): Sakhalin (Tym and Poronai rivers) (Reshetnikov et al., 1997).

25. Genus Tribolodon Sauvage

37. Tribolodon brandti (Dybowski), Pacific redfin, maruta-ugui (anadromous): Hokkaido, Sakhalin, Iturup, Kunashir (Berg, 1949a; Kluchareva, 1964; Gritsenko, 1974; Sakai, 1990; Nikoforov et al., 1994; Reshetnikov et al., 1997).





Comments. Tribolodon taczanowskii (Steindachner) is considered to be a junior synonym of Tribolodon brandti, following the conclusions of Sakai (1990).





38. Tribolodon ezoe Okada and Ikeda, redfin, ezo-ugui (freshwater): Hokkaido, Sakhalin, Iturup, Zelionyi (Berg, 1949a; Gritsenko, 1974; Kurawaka, 1977; Sakai, 1990; Nikoforov et al., 1994; Reshetnikov et al., 1997).





39. Tribolodon hakonensis (Günther), big-scaled redfin, ugui (anadromous and freshwater): Hokkaido, Sakhalin, Iturup, Kunashir (Berg, 1949a; Gritsenko, 1974; Kurawaka, 1977; Nikoforov et al., 1989, 1994; Sakai, 1990; Reshetnikov et al., 1997).

26. Genus Barbatula Linck

40. Barbatula toni (Dybowski), Siberian stone loach, fukudojô (freshwater): Hokkaido, Sakhalin (Berg, 1949a; Kluchareva, 1964; Nikoforov et al., 1989, 1994; Sawada, 1990; Reshetnikov et al., 1997).

27. Genus Lefua Herzenstein

41. Lefua costata (Kessler), eight-whiskered stone loach (freshwater): Sakhalin (Reshetnikov et al., 1997).

28. Genus Cobitis Linnaeus

42. Cobitis lutheri Rendahl, Luther's spiny loach (freshwater): Sakhalin (Reshetnikov et al., 1997).

29. Genus Misgurnus Lacepède

43. Misgurnus anguillicaudatus (Cantor), Amur mud loach, dojô (freshwater): Hokkaido, Sakhalin (Nikoforov et al., 1989, 1994; Saito, 1990; Reshetnikov et al., 1997).

30. Genus Silurus Linnaeus

44. Silurus asotus Linnaeus, Amur catfish, namazu (freshwater): Hokkaido, Sakhalin (Nikoforov et al., 1989; Kobayakawa, 1990).

31. Genus Eleginus Fischer

45. Eleginus gracilis (Tilesius), saffron cod, komai (marine, but often entering mouths of rivers and inhabiting freshwater lakes): Hokkaido, Sakhalin, Kamchatka (Nikoforov et al., 1994; Reshetnikov et al., 1997; Endo, 2000).

32. Genus Lota Oken

46. Lota lota (Linnaeus), burbot (freshwater): Sakhalin (Nikoforov et al., 1989; Reshetnikov et al., 1997).

33. Genus Gasterosteus Linnaeus

47. Gasterosteus aculeatus aculeatus Linnaeus, three-spined stickleback, itoyo (euryhaline): everywhere, including Hokkaido, Sakhalin, the Kuril Islands (Shumshu, Paramushir, Simushir, Urup, Iturup, Kunashir, Shikotan, Zelionyi, Iurii, Tanfilyeva), and Kamchatka (Berg, 1949b; Nikoforov et al., 1989, 1994; Hirai, 1990; Zuganov, 1991; Reshetnikov et al., 1997).

34. Genus Pungitius Coste

48. Pungitius pungitius pungitius (Linnaeus), nine-spined stickleback, ibara-tomiyo (euryhaline): everywhere, including Hokkaido, Sakhalin, the Kuril Islands (Shumshu, Paramushir, Iturup, Kunashir, Shikotan, Polonskogo, Zelionyi, Iurii, Anuchina, Tanfilyeva), and Kamchatka (Berg, 1949b; Nikoforov et al., 1989; Takada, 1990; Zuganov, 1991; Reshetnikov et al., 1997).





49. Pungitius pungitius sinensis (Guichenot), Chinese stickleback, tomiyo (freshwater): Hokkaido, Sakhalin, Kuril Islands (Shumshu, Paramushir, Urup, Iturup, Kunashir, Shikotan, Polonskogo, Zelionyi, Iurii, Tanfilyeva), western Kamchatka (Berg, 1949b; Nikoforov et al., 1989, 1994; Takada, 1990; Zuganov, 1991; Reshetnikov et al., 1997).





50. Pungitius tymensis (Nikolsky), short-spined (Sakhalin) stickleback, ezo-tomiyo (freshwater): Hokkaido, Sakhalin, Kuril Islands (Kunashir, Shikotan) (Berg, 1949b; Takada, 1990; Zuganov, 1991; Nikoforov et al., 1994; Reshetnikov et al., 1997).

35. Genus Cottus Linnaeus

51. Cottus amblystomopsis Schmidt, Sakhalin sculpin, ezohana-kajika (freshwater, euryhaline): Hokkaido, Sakhalin (Lutoga, Aleksandrovka, Poronai, and Tym rivers), Kunashir, Iturup, Shikotan (Berg, 1949b; Goto, 1983; Lindberg and Krasukova, 1987; Goto, 1990b; Nikoforov et al., 1994; Reshetnikov et al., 1997).

36. Genus Megalocottus Gill

52. Megalocottus platycephalus Pallas, flathead sculpin (marine, but often entering mouths of rivers): Sakhalin, Kamchatka (Reshetnikov et al., 1997).

37. Genus Mesocottus Gracianov

53. Mesocottus haitei (Dybowski) (freshwater): rivers of northern Sakhalin (Nikolsky, 1956; Nikoforov et al., 1989; Reshetnikov et al., 1997).

38. Genus Mugil Linnaeus

54. Mugil cephalus cephalus Linnaeus, striped mullet, bora (marine, euryhaline): Sakhalin (Berg, 1949b; Lindberg and Legeza, 1965; Reshetnikov et al., 1997; Seno, 2000).





55. Mugil soiuy Basilewsky, hearder (marine, euryhaline): southern Sakhalin (Berg, 1949b; Kluchareva, 1964; Lindberg and Legeza, 1965; Nikoforov et al., 1994).

39. Genus Perccottus Dybowski

56. Perccottus glenii Dybowski, Amur sleeper (freshwater): northwestern Sakhalin (Nikoforov et al., 1989).

40. Genus Acanthogobius Gill

57. Acanthogobius lactipes (Hilgendorf), ashishirohaze (euryhaline): Hokkaido, eastern Sakhalin (Lake Tunaicha) (Berg, 1949b; Lindberg and Krasukova, 1975, 1987; Pinchuk, 1978; Reshetnikov et al., 1997; Hagihara, 2000).

41. Genus Glossogobius Gill

58. Glossogobius olivaceus (Temminck and Schlegel), urohaze (euryhaline): Hokkaido, southern Sakhalin (Aniva Bay, Lake Chepisani) (Lindberg and Krasukova, 1987; Iwata, 1990b; Reshetnikov et al., 1997).

42. Genus Gymnogobius Gill

59. Gymnogobius castaneus (O'Shaughnessy), chestnut goby, biringo (euryhaline): Hokkaido, Sakhalin, Iturup, Kunashir, Shikotan (Anama and Notoro bays) (Berg, 1949b, Pinchuk, 1978, 1981, 1984; Lindberg and Krasukova, 1987; Sahara, 1990; Nikoforov et al., 1994; Reshetnikov et al., 1997).





60. Gymnogobius n. sp. Stevenson (euryhaline): Hokkaido, southern Sakhalin, Kunashir (Pinchuk, 1992; Nikoforov et al., 1994; Stevenson, 2000, in preparation).





61. Gymnogobius laevis (Steindachner), juzukakehaze (euryhaline): Hokkaido, southern Sakhalin, Polonskogo, Zelionyi, Tanfilyeva (Pinchuk, 1978; Kishi, 1990).





62. Gymnogobius macrognathos (Bleeker), edohaze (euryhaline): Hokkaido, southern Sakhalin (Aniva Bay) (Berg, 1949b, Pinchuk, 1978; Lindberg and Krasukova, 1987; Iwata, 1990b; Reshetnikov et al., 1997).





63. Gymnogobius taranetzi Pinchuk (euryhaline): southern Sakhalin (Pinchuk, 1978, 1981; Lindberg and Krasukova, 1987; Reshetnikov et al., 1997).





64. Gymnogobius urotaenia (Hilgendorf), ukigori (euryhaline): Hokkaido, southern Sakhalin, Kunashir, Iturup, Shikotan, Zelionyi, Tanfilyeva (Pinchuk, 1978; Lindberg and Krasukova, 1987; Ishino, 1990; Nikoforov et al., 1994).

43. Genus Rhinogobius Gill

65. Rhinogobius brunneus (Temminck and Schlegel), Amur goby, yoshinobori (usually in freshwater): Hokkaido, Sakhalin (Berg, 1949b; Pinchuk, 1978; Hayashi, 1984; Lindberg and Krasukova, 1987; Nikoforov et al., 1994; Reshetnikov et al., 1997).

44. Genus Tridentiger Gill

66. Tridentiger brevispinis kuroiwae Katsuyama, Arai, and Nakamura, numa-chichibu (euryhaline): Hokkaido, Sakhalin, Kunashir, Iturup (Iwata, 1990b; Pinchuk, 1992; Nikoforov et al., 1994).





67. Tridentiger obscurus (Temminck and Schlegel), threadfin goby, chichibu (euryhaline): southern Sakhalin, Iturup (Zmeika River) (Berg, 1949b; Kluchareva, 1964; Pinchuk, 1978; Lindberg and Krasukova, 1987; Kishi, 1990; Reshetnikov et al., 1997).

45. Genus Kareius Jordan and Snyder

68. Kareius bicoloratus (Basilewsky), ishigarei (euryhaline): Hokkaido, Sakhalin, Kuril Islands (Sakamoto, 2000).

46. Genus Liopsetta Gill

69. Liopsetta pinnifasciatus (Kner), Arctic flounder, tôgarei (euryhaline): Hokkaido, southern Sakhalin, Kuril Islands, Kamchatka (Lyutoga River) (Reshetnikov et al., 1997; Sakamoto, 2000).

47. Genus Platichthys Girard

70. Platichthys stellatus (Pallas), starry flounder, numagarei (marine, but often entering mouths of rivers): Hokkaido, Sakhalin, Shumshu, Paramushir, Iturup, Kamchatka (Nikoforov et al., 1994; Reshetnikov et al., 1997; Sakamoto, 2000).

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