A preliminary investigation into the vulnerability of young trout (<i>Salmo trutta</i> L.) and Atlantic salmon (<i>S. salar</i> L.) to downstream displacement by high water velocities

Ottaway, E. M.; Clarke, AE

doi:10.1111/j.1095-8649.1981.tb05818.x

Cited by 92 publications

(79 citation statements)

References 10 publications

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“…The difference between the species resulted from a greater degree of downstream dispersal by emergent rainbow fry, producing a large nocturnal outmigration of fry into the lake. Similar nocturnal downstream migration of emergent fry has been reported for rainbow trout (e.g., Alexander & MacCrimmon 1974;Erman & Leidy 1975), brown trout (e.g., Heland 1980;Ottaway & Clarke 1981), and for other salmonid species (e.g., Hoar 1958;Au 1971;Reimers 1973;Mason 1975). …”

Section: Discussionmentioning

confidence: 70%

Comparative stream residence of juvenile brown and rainbow trout in a small lake inlet tributary, Scotts Creek, New Zealand

Hayes

1988

New Zealand Journal of Marine and Freshwater Research

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Species composition, population changes, and emigration of 0+ trout in Scotts Creek, an inlet tributary of Lake Alexandrina, were studied from 1979 to 1982. Trout populations were dominated by late emerging 0+ rainbow trout. Rainbow trout juvenile migration consisted primarily of newly emerged nocturnally migrant fry, whereas that of brown trout was mostly of fish which had undergone a period of stream residence. Pattern of initial downstream migration of early migrants was consistent with a passive dispersal mechanism. Although rainbow trout dominated the 0+ salmonid populations, brown trout made greater proportional use of the stream for rearing. This situation arose from differences in patterns of emigration between the species, particularly that of newly emerged fry, with rainbow trout showing a much greater tendency to emigrate upon emergence. The significance of migratory strategies and interspecific competition in relation to lotic versus lentic rearing of brown and rainbow trout is discussed.

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Section: Discussionmentioning

confidence: 70%

Comparative stream residence of juvenile brown and rainbow trout in a small lake inlet tributary, Scotts Creek, New Zealand

Hayes

1988

New Zealand Journal of Marine and Freshwater Research

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“…In addition to scouring eggs and alevins from the substrate, floods could impair the survival of emergent fry. The emergent fry stage is known to be a critical time for survival (Allen 1951;Elliott 1989;LeCren 1965) and emergent fry are very susceptible to downstream displacement by high flows (Ottaway & Clarke 1981;Ottaway & Forest 1983;Heggenes & Traaen 1988). Stephens (1989) reported reductions in 0+ rainbow trout densities in the Tongariro River associated with flooding which appeared to be most severe at the early fry stage.…”

Section: Association Between Relative Density and Flow Perturbationsmentioning

confidence: 99%

Spatial and temporal variation in the relative density and size of juvenile brown trout in the Kakanui River, North Otago, New Zealand

Hayes

1995

New Zealand Journal of Marine and Freshwater Research

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Spatial and temporal variation in relative density of 0+ and 1+ brown trout was examined over three summers in the Kakanui River, North Otago, New Zealand. Both 0+ and 1+ trout were distributed throughout the river. Spatial variation in relative density was much higher than annual variation. Within years, relative density of 0+ brown trout varied by 5 to 92 times between sites (mean coefficient of variation, CV = 1.08) and of 1+ trout by 18 to 84 times between sites (CV = 1.13). Mean relative density of 0+ brown trout varied by 1.5 to 2.0 times between years (CV = 0.35) and of 1+ trout by 3.6 to 23.2 times between years (CV = 0.96). The pattern of 0+ trout spatial distribution was not closely related to the distribution of redds (which also were distributed throughout the river) and not related to the distribution of benthic invertebrate food. By their second summer, most trout occupied the middle and lower reaches of the river. Mean length of both 0+ and 1+ trout increased with distance downstream. Floods greater than 290 m 3 s -1 , and with a return period of 4 years, during the late incubation and early fry stages (August-November) were associated with impaired recruitment, yet a large flood (816 m 3 s -1 ) in March 1994 had no apparent effect on the survival of 0+ trout 80-100 mm in length.M 94042

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“…These pulsed flows may impact the behavior of resident or migratory fish, particularly juvenile salmonids, by forcing them downstream (McCrimmon 1954;Erman and Leidy 1975;Ottaway and Clarke 1981;Ottaway and Forrest 1983;Heggenes and Traaen 1988;Crisp 1991;Crisp and Hurley 1991;Pearsons et al 1992). This may result in increased mortality, decreased growth, or decreased reproduction.…”

Section: Introductionmentioning

confidence: 99%

Distribution and movement of domestic rainbow trout, Oncorhynchus mykiss, during pulsed flows in the South Fork American River, California

Cocherell

Jones²,

Miranda³

et al. 2010

Environ Biol Fish

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We tracked the movements of ten small (SL=25.5-31.0 cm) and ten large (SL=32.0-38.5 cm) radio-tagged domestic rainbow trout (Oncorhynchus mykiss) in response to frequent pulsed releases of water in the South Fork American River (California) from July to October 2005. In week one all the small trout moved less than 1 km upstream or downstream of their release sites. Four small trout moved 1-3 km upstream or downstream of their release sites in the following 8 weeks. Seven out of ten large trout moved downstream after their release. In subsequent weeks most large trout showed smaller upstream and downstream movements, and were observed between 1 km upstream and 8 km downstream of their release sites. Our results suggest that domestic rainbow trout with SL>25 cm are not forced downstream by daily pulsed flow increases from 5 to over 40 m 3 s −1 .

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A preliminary investigation into the vulnerability of young trout (Salmo trutta L.) and Atlantic salmon (S. salar L.) to downstream displacement by high water velocities

Cited by 92 publications

References 10 publications

Comparative stream residence of juvenile brown and rainbow trout in a small lake inlet tributary, Scotts Creek, New Zealand

Comparative stream residence of juvenile brown and rainbow trout in a small lake inlet tributary, Scotts Creek, New Zealand

Spatial and temporal variation in the relative density and size of juvenile brown trout in the Kakanui River, North Otago, New Zealand

Distribution and movement of domestic rainbow trout, Oncorhynchus mykiss, during pulsed flows in the South Fork American River, California

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