Movement of wild and experimentally stocked brown trout, Salmo trutta L., before and after a flood in a small Austrian stream

Weirs and traps were used to monitor the movement of two strains of stocked brown trout, Salmo trutta L. Within 24 h of stocking, 15% (n = 13) of a Danish strain and 21% (n = 19) of a hybrid strain moved at least 100 m from their release site. In the following 5–6 days, no further movement was found for Danish fish, but hybrid fish continued to move, totaling 32% (n = 29) of the fish stocked. During this same period, 36 wild brown trout (≈ 3.5% of the population) were captured, moving over the weirs. Two weeks later, and one week after a flood, 70% (n = 59) of the Danish strain were recovered within their release sites and 89% (n = 76) were recovered during an electric fishing survey within the 3.5-km-long experimental area. In contrast, 43% (n = 31) of the hybrid strain were recaptured in their release sites and 49% (n = 45) within the experimental area. The total recapture of wild adult fish was only 16% (n = 41). The flooding event was insignificant in comparison with strain-specific behaviours in determining patterns of movement and residency.Austria, brown trout, floods, movement, stocking.

[1]  S. Schmutz,et al.  Performance of hatchery-reared brown trout and their effects on wild fish in two small austrian streams , 1999 .

[2]  K. Fausch,et al.  Mobile brook trout in two high-elevation Colorado streams: Re-evaluating the concept of restricted movement , 1996 .

[3]  G. Raddum,et al.  Dispersal, growth and mortality of brown trout (Salmo trutta L.) stocked in a regulated West Norwegian river , 1995 .

[4]  E. L. Brannon.  The perpetual oversight of hatchery programs , 1993 .

[5]  T. Quinn.  A review of homing and straying of wild and hatchery-produced salmon , 1993 .

[6]  R. Wiley,et al.  An Evaluation of the Potential for Training Trout in Hatcheries to Increase Poststocking Survival in Streams , 1993 .

[7]  Hiram W. Li,et al.  Influence of Habitat Complexity on Resistance to Flooding and Resilience of Stream Fish Assemblages , 1992 .

[8]  M. G. Johnson,et al.  Estimation of Temporal Acidification of Central Ontario Lakes , 1991 .

[9]  S. Berg,et al.  Stocking experiments with 0 + and 1 + trout parr, Salmo trutta L., of wild and hatchery origin: 2. Post‐stocking movements , 1991 .

[10]  K. Hindar,et al.  Genetic Effects of Cultured Fish on Natural Fish Populations , 1991 .

[11]  J. Johnsson,et al.  Interbreeding with Domestic Strain Increases Foraging under Threat of Predation in Juvenile Steelhead Trout (Oncorhynchus mykiss): An Experimental Study , 1991 .

[12]  B. Riddell,et al.  Variation in Agonistic Behavior between Newly Emerged Juveniles from Hatchery and Wild Populations of Coho Salmon, Oncorhynchus kisutch , 1990 .

[13]  Arthur V. Brown,et al.  The Role of Disturbance in Stream Ecology , 1988, Journal of the North American Benthological Society.

[14]  C. Petrosky,et al.  Response of Wild Rainbow (Salmo gairdneri) and Cutthroat Trout (S. clarki) to Stocked Rainbow Trout in Fertile and infertile Streams , 1988 .

[15]  J. Heggenes.  Effects of Short-Term Flow Fluctuations on Displacement of, and Habitat Use by, Brown Trout in a Small Stream , 1988 .

[16]  R. Williams,et al.  Movements of brown trout, Salmo trutta L., in the River Gwyddon, South Wales , 1984 .

[17]  Kenneth Ersbak,et al.  Nutritional Deprivation after Stocking as a Possible Mechanism Leading to Mortality in Stream-Stocked Brook Trout , 1983 .

[18]  R. C. Cresswell,et al.  Post‐stocking movements and recapture of hatchery‐reared trout released into flowing waters—a review , 1981 .

[19]  C. Krueger,et al.  Effects of Stocking on Genetics of Wild Brook Trout Populations , 1979 .

[20]  H. Maccrimmon,et al.  Evaluation of the contribution of supplemental plantings of brown trout Salmo trutta (L.) to a self‐sustaining fishery in the Sydenham River, Ontario, Canada , 1972 .

[21]  V. Loeschcke,et al.  Effects of releasing hatchery-reared brown trout to wild trout populations , 1994 .

[22]  T. Flagg,et al.  A Review of Seminatural Culture Strategies for Enhancing the Postrelease Survival of Anadromous Salmonids , 1994 .

[23]  A. Peter.  Untersuchungen über die Populationsdynamik der Bachforelle (Salmo trutta fario) im System der Wigger, mit besonderer Berücksichtigung der Besatzproblematik , 1987 .

[24]  E. R. Vincent.  Effects of Stocking Catchable-Size Hatchery Rainbow Trout on Two Wild Trout Species in the Madison River and O'Dell Creek, Montana , 1987 .

[25]  J. Marliave.  Lack of Planktonic Dispersal of Rocky Intertidal Fish Larvae , 1986 .

[26]  E. L. Brannon.  Influence of Stock Origin on Salmon Migratory Behavior , 1984 .

[27]  R A Bachman,et al.  Foraging Behavior of Free-Ranging Wild and Hatchery Brown Trout in a Stream , 1984 .

[28]  Peter B. Moyle,et al.  Fishes: An Introduction to Ichthyology , 1982 .

[29]  J. Mcintyre,et al.  Genetic Differences in Growth and Survival of Juvenile Hatchery and Wild Steelhead Trout, Salmo gairdneri , 1977 .

[30]  T. M. Jenkins.  Social Structure, Position Choice and Micro-distribution of Two Trout Species (Salmo trutta and Salmo gairdneri) Resident in Mountain Streams , 1969 .

[31]  W. H. Everhart,et al.  Comparative Agonistic and Feeding Behavior of Hatchery-Reared and Wild Salmon in Aquaria , 1968 .

[32]  R. B. Miller.  The Rôle of Competition in the Mortality of Hatchery Trout , 1958 .

[33]  P. Needham,et al.  Survival of Hatchery-Reared Brown and Rainbow Trout as Affected by Wild Trout Populations , 1944 .