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11 Result(s)

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  1. Article

    Open Access

    The past, present, and a future for native charr in Japan

    Charrs (Salvelinus) reach their southernmost distribution in Japan, and are uniquely adapted to the short, steep streams of this island archipelago. Southern Asian Dolly Varden (Salvelinus curilus) occur only in ...

    Kurt D. Fausch, Kentaro Morita, Jun-ichi Tsuboi, Yoichiro Kanno… in Ichthyological Research (2024)

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  2. No Access

    Article

    No apparent effects of the buccal cavity attaching parasite, Salmincola sp. (Copepoda: Lernaeopodidae), on a stream salmonid: a mark-recapture study

    We evaluated the effects of a buccal cavity attaching Salmincola sp. on white-spotted charr Salvelinus leucomaenis by mark-recapture method to compare body condition, growth, and apparent survival within a headwa...

    Christopher G. Ayer, Kodai Morita, Sho Fukui, Itsuro Koizumi in Ichthyological Research (2022)

  3. No Access

    Article

    Local factors affecting winter habitat use of non-native rainbow trout in a boreal stream in northern Japan

    Despite its potential use for population control, the winter ecology of nonnative fishes is still poorly understood due to the difficulty of conducting field surveys. In this study, we investigated the winter ...

    Chiharu Furusawa, Yukiyo Suehiro-Kanazawa, Yuuki Tanaka… in Ichthyological Research (2022)

  4. No Access

    Article

    No reduction of hatching rates among F1 hybrids of naturally hybridizing three Far Eastern daces, genus Tribolodon (Cypriniformes, Cyprinidae)

    Egg hatching rates of F1 hybrids among three fishes, Japanese dace Tribolodon hakonensis, Pacific redfin T. brandtii, and rosyface dace T. sachalinensis, were compared with pure crosses. They are highly divergent...

    Keisuke Atsumi, Kazuhiro Nomoto, Yoshiyasu Machida… in Ichthyological Research (2018)

  5. No Access

    Article

    Mass immigration of juvenile fishes into a small, once-dried tributary demonstrates the importance of remnant tributaries as wintering habitats

    The winter ecology of stream fishes is still poorly understood, especially in non-salmonid species. A small tributary (<4 m in width, <1 km in length) of the Otofuke River (central Hokkaido, northern Japan) de...

    Itsuro Koizumi, Yuuki Tanaka, Yukiyo Kanazawa in Ichthyological Research (2017)

  6. No Access

    Article

    Extreme winter aggregation of invasive rainbow trout in small tributaries: implications for effective control

    Because of their high economic and recreational value, salmonids have been extensively introduced worldwide and are responsible for significant impacts on native ecosystems. However, effective methods for cont...

    Itsuro Koizumi, Yukiyo Kanazawa, Chitose Yamazaki, Yuuki Tanaka… in Ichthyological Research (2017)

  7. No Access

    Article

    Different habitat salinity between genetically divergent groups of a worm-like goby Luciogobius guttatus: an indication of cryptic species

    Gobies of the genus Luciogobius have unusual morphological adaptations to interstitial rocky coastal habitats in far eastern Asia; an elongated scale-less body, the loss the first dorsal fin, and a drastically in...

    Seiya Hashimoto, Itsuro Koizumi, Kotaro Takai… in Environmental Biology of Fishes (2014)

  8. No Access

    Article

    Hybridization between native white-spotted charr and nonnative brook trout in the upper Sorachi River, Hokkaido, Japan

    Invasion status and impacts of nonnative brook trout (Salvelinus fontinalis) in a Hokkaido stream were investigated with field surveys and genetic analyses. Nonnative brook trout was detected in nine (41 %) of th...

    Satoshi Kitano, Satoshi Ohdachi, Itsuro Koizumi, Koh Hasegawa in Ichthyological Research (2014)

  9. No Access

    Article

    Occurrence of a hybrid between endemic Miyabe charr Salvelinus malma miyabei and introduced masu salmon Oncorhynchus masou masou in the Lake Shikaribetsu system, Hokkaido, Japan

    A hybrid specimen between endemic Miyabe charr Salvelinus malma miyabei and introduced masu salmon Oncorhynchus masou masou was collected in an inlet stream (Yamada Creek) of the Lake Shikaribetsu. This specimen ...

    Itsuro Koizumi, Haruki Kobayashi, Koji Maekawa, Noriko Azuma… in Ichthyological Research (2005)

  10. No Access

    Article

    Does the Refuge Availability Influence the Spawning Behavior of Mature Male Parr in Salmonids? A Test in the Miyabe Charr

    In many salmon and charr, both 'migratory males' and 'precocious males' are maintained as alternative life-histories within a population. During breeding, precocious males gather around the mating pair of migr...

    Yusuke Koseki, Itsuro Koizumi, Haruki Kobayashi… in Environmental Biology of Fishes (2002)

  11. No Access

    Chapter

    Does the refuge availability influence the spawning behavior of mature male parr in salmonids? A test in the Miyabe charr

    In many salmon and charr, both ‘migratory males’ and ‘precocious males’ are maintained as alternative life-histories within a population During breeding, precocious males gather around the mating pair of migra...

    Yusuke Koseki, Itsuro Koizumi… in Ecology, behaviour and conservation of the… (2002)