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Article
Open AccessThe 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 ...
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Article
Open AccessDiverse migration patterns of anadromous white-spotted charr Salvelinus leucomaenis revealed from otolith microchemistry
Anadromous migration of salmonid fish has been extensively studied, primarily focusing on the dichotomous framework of anadromy and residency. However, there remains a limited understanding of intermediate mig...
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Article
Open AccessLongitudinal structuring of stream-fish assemblages: is niche partitioning observed in two-species systems applicable to three-species systems?
Longitudinal distribution and niche partitioning phenomena have been extensively reported for streams containing two salmonid species but remain poorly understood for streams containing three or more salmonid ...
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Article
Occurrence of mature male white-spotted charr (Salvelinus leucomaenis) in spring, an unusual season
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Article
Japanese eel at the northern edge: glass eel migration into a river on Hokkaido, Japan
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Article
Spatial expansion and increased population density of masu salmon parr independent of river restoration
Spatial expansion and increased population abundance of masu salmon Oncorhynchus masou have been recently reported following habitat restoration in some rivers, but no studies have examined these types of changes...
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Article
Potential threat of introduced rainbow trout Oncorhynchus mykiss to native salmonids in the western part of Hokkaido, Japan
We obtained the following five results in 10 rivers while elucidating the potential threat of introduced rainbow trout to native salmonids. First, native salmonid density decreased with increasing trout densit...
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Article
Fall–winter collection of two salmonid species: seasonal changes in population densities in four tributaries of the Kushiro river system
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Article
Seasonal changes in stream salmonid population densities in two tributaries of a boreal river in northern Japan
We examined seasonal changes in population densities of stream salmonids (masu salmon Oncorhynchus masou, white-spotted charr Salvelinus leucomaenis, and rainbow trout O. mykiss) in two tributaries of the Shoro R...
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Article
Evidence of downstream migration of Sakhalin taimen, Hucho perryi, as revealed by Sr : Ca ratios of otolith
The migratory history of Sakhalin taimen, Hucho perryi, was examined in terms of strontium (Sr) and calcium (Ca) uptake in the otolith by using wavelength dispersive X-ray spectrometry on an electron microprobe. ...
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Article
Marine growth and survival of white-spotted charr,Salvelinus leucomaenis, in relation to smolt size
The relationships between marine growth and survival, and smolt sizes were examined for white-spotted charr (Salvelinus leucomaenis) populations in the Nairo River, Rebun Island, off northern Hokkaido Island, and...