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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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Spawning habitat characteristics and egg mortality in relation to river geomorphology and run-times of chum salmon (Oncorhynchus keta) in a metropolitan river system, northern Japan
We investigated the geomorphology and environmental variables in which early- and late-run chum salmon groups spawn in an urban section of the Toyohira River, northern Japan, in relation to egg mortality, wher...
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Reverse migration of adult pink salmon (Oncorhynchus gorbuscha) to the sea after their return to fresh water
Few studies have examined the movement of adult Pacific salmon Oncorhynchus spp. between the sea and rivers after they have entered a river. In this study, archival tags that recorded temperature and salinity wer...
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Size-selective mortality occurs in smolts during a seaward migration, but not in river residents, in masu salmon (Oncorhynchus masou)
Salmonid fish often experience size-selective mortality when descending the river (i.e., seaward migration). However, it is unknown whether size-selective mortality is specific to this life history (i.e., migr...
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Article
Occurrence of mature male white-spotted charr (Salvelinus leucomaenis) in spring, an unusual season
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Japanese eel at the northern edge: glass eel migration into a river on Hokkaido, Japan
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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
Differential effects of the environment on the growth of arabesque greenling (Pleurogrammus azonus): does rising temperature benefit young but not old fish?
Annual and spatial variations in the growth condition of the arabesque greenling (Pleurogrammus azonus) were examined in relation to temperature and food availability. We found age-dependent effects of temperatur...
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Fall–winter collection of two salmonid species: seasonal changes in population densities in four tributaries of the Kushiro river system
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Sex-biased dispersal and growth in sablefish (Anoplopoma fimbria) in the northeastern Pacific Ocean
To examine the potential linkage between sex-biased growth and dispersal in demersal fish, we studied the movement distance and growth of tag-recaptured sablefish (Anoplopoma fimbria). Tagging was conducted by te...
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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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Offshore Dolly Varden charr (Salvelinus malma) in the North Pacific
Many studies have investigated the ecology of charrs in freshwater, however, little is known about charrs in the ocean. This study examined the distribution, seasonal abundance, and some biological features of...
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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...