Size-Dependent Smolt Yield and Overwinter Survival of Hatchery-Reared Masu Salmon Released in Fall

Miyakoshi, Yasuyuki; Hayano, Hirofumi; Fujiwara, M.; Nagata, Mitsuhiro; Irvine, James R.

doi:10.1577/1548-8675(2003)023<0264:sdsyao>2.0.co;2

Cited by 5 publications

(3 citation statements)

References 19 publications

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“…We observed increased apparent survival with juvenile coho salmon body size. These results are consistent with previous findings relating overwinter survival of juvenile salmonids to fall size (Quinn and Peterson 1996;Miyakoshi et al 2003). An exception to this trend was noted for Moore Creek, an intermittent stream that had intermediate size coho salmon parr in the fall but produced the largest smolts and had the highest overwinter survival rates, in part due to higher winter growth rates.…”

Section: Discussionsupporting

confidence: 93%

Juvenile Coho Salmon Growth and Survival across Stream Network Seasonal Habitats

et al. 2006

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Understanding watershed-scale variation in juvenile salmonid survival and growth can provide insights into factors influencing demographics and can help target restoration and mitigation efforts for imperiled fish populations. We assessed growth, movement, and apparent overwinter survival of individually tagged juvenile coho salmon Oncorhynchus kisutch in a coastal Oregon watershed from June 2002 to June 2003 and related growth and survival parameters to stream characteristics. Fall body size of juvenile coho salmon was a good predictor of smolt size and survival, but smolt size was also influenced by overwintering location. This was due to strong spatial patterns in winter growth rates associated with residency and movement into a small intermittent tributary. Though nearly dry in midsummer, this stream supported high densities of spawning coho salmon in the fall, and juveniles rearing there exhibited relatively high growth rates and emigrated as larger smolts. Improved winter growth and survival of juvenile coho salmon utilizing tributary habitats underscore the importance of maintaining connectivity between seasonal habitats and providing a diversity of sheltering and foraging opportunities, particularly where main-stem habitats have been simplified by human land uses.

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Section: Discussionsupporting

confidence: 93%

Juvenile Coho Salmon Growth and Survival across Stream Network Seasonal Habitats

et al. 2006

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“…Most studies of overwinter mortality of youngof-the-year fishes have been conducted for important forage fish species (Keast & Eadie 1984) and recreationally or commercially valuable species (Keast & Eadie 1984, Miyakoshi et al 2003. Further, these studies have been conducted almost exclusively on populations from northern temperate latitudes where there is a short growing season (Conover 1992).…”

Section: Speciesmentioning

confidence: 99%

Relationship between hatch date and first-summer growth of five species of prairie-stream cyprinids

Durham

Wilde

2005

Environ Biol Fish

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SynopsisStream fishes often exhibit a bet-hedging multiple spawning reproductive strategy. In many species, the reproductive season lasts several months. This exposes young fishes to varying environmental conditions that may differentially affect growth. We studied the effect of hatch date on first-summer growth among members of a prairie-stream fish assemblage. The reproductive season in both years of the study was protracted, lasting from April through August. Due to intermittent stream-discharge, there were two distinct periods during which most species successfully reproduced. In general, growth rate was greater among individuals with an early hatch date than among those with a later hatch date. Multiple regression models indicated that hatch date was related to growth in all study species with one exception (red shiner, Cyprinella lutrensis). The results of this study provide evidence that young-of-the-year of multiple spawning stream-fish species that are spawned late in the season may grow at a slower rate than young spawned earlier in the season.

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“…For example, of 71 Columbia River basin salmonid supplementation projects reviewed by the Bonneville Power Administration (BPA 1992), only 6 (8%) used releases of fry or parr. This is presumably due to the fact that larger fish generally have higher survival rates in the wild (Hume and Parkinson 1988;Brown and Day 2002;Miyakoshi et al 2003), but this is not always the case (Borgstrøm et al 2002), and we are aware of no published experiments that have quantified the survival advantage associated with release strategies (e.g., fry, presmolt, and smolt) for juvenile steelhead. Some studies suggest that survival rates of steelhead fry stocked at low density may be similar to wild salmonid fry survival, particularly when wild fish densities are low (Hume and Parkinson 1987;Rhodes and Quinn 1999).…”

Section: Management Implicationsmentioning

confidence: 99%

Behavior of Steelhead Fry in a Laboratory Stream is Affected by Fish Density but Not Rearing Environment

Riley

Tatara

Berejikian

et al. 2009

N American J Fish Manag

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We quantified the aggression, feeding, dominance, position choice, and territory size of naturally reared steelhead Oncorhynchus mykiss fry stocked with two types of hatchery‐reared fry (from conventional and enriched rearing environments) at two densities in experimental flumes to determine how rearing environment and fish density affect the behavior of steelhead fry. We found that fry density had a significant effect on most response variables but that rearing treatment did not. The rates of threats and attacks were positively correlated with fry density, but the overall feeding rate was negatively correlated. Naturally reared fry were dominant more often at low densities, and hatchery‐reared fry were dominant more often at high densities. There were no significant effects of hatchery rearing treatment on aggression, feeding, dominance, or territory size. The only significant effect of rearing treatment was on the position of naturally reared fry, which occupied more upstream positions when stocked with conventional than with enriched hatchery‐reared fry. Overall, rearing environment had relatively little influence on the behavior of steelhead fry. Our results indicate that stocking hatchery‐reared steelhead fry at low densities may have effects on similar‐size wild fish comparable to an equivalent increase in the density of wild fish. We suggest that releasing hatchery‐reared steelhead fry as a supplementation strategy may have few direct negative ecological effects on wild fry.

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Size-Dependent Smolt Yield and Overwinter Survival of Hatchery-Reared Masu Salmon Released in Fall

Cited by 5 publications

References 19 publications

Juvenile Coho Salmon Growth and Survival across Stream Network Seasonal Habitats

Juvenile Coho Salmon Growth and Survival across Stream Network Seasonal Habitats

Relationship between hatch date and first-summer growth of five species of prairie-stream cyprinids

Behavior of Steelhead Fry in a Laboratory Stream is Affected by Fish Density but Not Rearing Environment

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