The impact of introduced pike (Esox lucius L.) on allopatric brown trout (Salmo trutta L.) in a small stream

The Norwegian electrical energy supply system is based on hydropower. The now deregulated energy market has led to increased use of hydropeaking production, leading to greater fluctuations in discharge and water levels below hydropower stations. The power station HOL 1, with an outlet to the Storåne River, is a large hydropeaking facility. With over 300 rapid flow increases and decreases per year since 2012, it is a river subjected to frequent hydropeaking. To quantify the stranding risk downstream of the power plant, the effect of a series of different turbine shutdown scenarios was simulated in an earlier study. The residual flow of 6 m3·s−1 and a full production of 66 m3·s−1 were considered as the baselines for the calculation of dewatered areas. A three-year study of juvenile fish density both upstream as a reference and downstream of the power plant was undertaken. There were very low densities or even an absence of brown trout (Salmo trutta) older than young-of-the-year (YoY) below the outlet of the power station, despite high densities of YoY in previous years. This is probably due to the large and rapid changes in flow below the power station. Hydropeaking has less impact on the earliest life stages of brown trout during spring and summer, as well as on spawning and egg development during winter. This is attributed spawning in late autumn occurring at a low flow seldom reached during hydropeaking. The high survival of YoY during the first summer and early autumn is likely due to a lower frequency of hydropeaking and higher residual flows, leaving a larger wetted area.

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Probability of First Sexual Maturation of Male Parr in Wild Sea-run Brown Trout (Salmo trutta) Depends on Condition Factor 1 yr in Advance

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f94-193 ◽

1994 ◽

Vol 51 (9) ◽

pp. 1920-1926 ◽

Cited By ~ 34

Author(s):

Torgny Bohlin ◽

Claes Dellefors ◽

Ulo Faremo

Keyword(s):

Brown Trout ◽

Salmo Trutta ◽

Condition Factor ◽

Mature Male ◽

Small Stream ◽

Late Autumn ◽

Passive Integrated Transponders ◽

Brown Trout Salmo Trutta ◽

Mature Male Parr ◽

Electric Fishing

In three years, in late autumn, underyearling wild sea-run brown trout (Salmo trutta) in a small stream were captured with electric fishing and tagged with microchips (passive integrated transponders). They were recaptured during the following season either as migrating smolts in a trap or by electric fishing in the stream just after the migration period and during spawning (late autumn). At spawning, they were distinguished as sexually mature male parr or immature juveniles. The smolts were longer and heavier at tagging than the mature male parr and the immature parr, which were similar in initial length and weight. The mature male parr had a significantly higher condition factor at tagging than the immature parr. The probability of parr maturation was positively associated with initial condition factor but not with initial body length. Growth of mature male parr and immature parr was similar in the early season but higher for immature parr in the late season. The result indicated that the choice of strategy was made earlier in life than previously recognized.

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Small-scale dispersal and population structure in stream-living brown trout (Salmo trutta) inferred by mark–recapture, pedigree reconstruction, and population genetics

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f2012-073 ◽

2012 ◽

Vol 69 (9) ◽

pp. 1513-1524 ◽

Cited By ~ 26

Author(s):

Leif Asbjørn Vøllestad ◽

Dimitar Serbezov ◽

Arthur Bass ◽

Louis Bernatchez ◽

Esben Moland Olsen ◽

...

Keyword(s):

Brown Trout ◽

Salmo Trutta ◽

Isolation By Distance ◽

Juvenile Fish ◽

Age Groups ◽

Small Scale ◽

Mark Recapture ◽

Small Stream ◽

Brown Trout Salmo Trutta ◽

Mature Fish

Many animals move among habitats, and even small-scale dispersal of individuals between habitat patches may have strong implications for population dynamics and structure. Here, we use long-term mark–recapture data combined with extensive genotyping and parentage assignment to investigate the importance of small-scale location change of resident brown trout ( Salmo trutta ) in a small stream (1500 m). During the first summer, juvenile fish dispersed downstream (mean displacement 200 m), with smaller juveniles dispersing longer distances. Downstream movement was also predominant during the first winter, but older fish moved little. This limited dispersal resulted in a significant isolation-by-distance structure for ages 1 and 2, but not for older age groups or for the mature fish. Individual pairwise relatedness coefficients decreased with waterway distance for mature fish during the 2002 and 2003 spawning seasons, but only weakly. Overall, between-site genetic differentiation was stronger for the younger age classes, and the signal decayed with age, indicating that the genetic structure observed in the stream is mainly driven by spatial aggregation of close relatives.

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Erratum to: Assessing the impact of climate change on brown trout (Salmo trutta fario) recruitment

Hydrobiologia ◽

10.1007/s10750-015-2223-3 ◽

2015 ◽

Vol 751 (1) ◽

pp. 23-24

Author(s):

Julian Junker ◽

Florian U. M. Heimann ◽

Christoph Hauer ◽

Jens M. Turowski ◽

Dieter Rickenmann ◽

...

Keyword(s):

Climate Change ◽

Brown Trout ◽

Salmo Trutta ◽

Impact Of Climate Change ◽

Brown Trout Salmo Trutta ◽

The Impact ◽

Salmo Trutta Fario

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Feeding by hatchery- and pond-reared brown trout, Salmo trutta L., fingerlings released in a lake and in a small stream

Aquaculture Research ◽

10.1111/j.1365-2109.1990.tb00462.x ◽

1990 ◽

Vol 21 (2) ◽

pp. 253-258 ◽

Cited By ~ 3

Author(s):

B. O. JOHNSEN ◽

O. UGEDAL

Keyword(s):

Brown Trout ◽

Salmo Trutta ◽

Small Stream ◽

Brown Trout Salmo Trutta

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Temperature affects growth allometry and development patterns in brown trout (Salmo trutta) fry: a multitrait approach

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/cjfas-2017-0037 ◽

2018 ◽

Vol 75 (5) ◽

pp. 714-722 ◽

Cited By ~ 4

Author(s):

Emilie Réalis-Doyelle ◽

Enric Gisbert ◽

Carles Alcaraz ◽

Fabrice Teletchea ◽

Alain Pasquet

Keyword(s):

Brown Trout ◽

Growth Phase ◽

Salmo Trutta ◽

Developmental Stages ◽

Growth Patterns ◽

Second Growth ◽

Brown Trout Salmo Trutta ◽

Allometric Analysis ◽

The Impact ◽

Skeletal Mineralization

To study the influence of temperature (4, 6, and 12 °C) on the development of brown trout (Salmo trutta) from hatching to the end of metamorphosis, an analysis of allometric growth patterns was conducted to identify two different groups of individuals, namely developmental phases at total lengths (TL) ranging from 2.72 cm at 4 °C to 2.22 cm at 12 °C. Then, a multitrait approach considering different variables like the survival rate, development time, morphometric characteristics, energetic value, and skeletal mineralization was conducted on these two groups. Results indicated that the first growth phase was slower at 4 °C, whereas the second was also slower at this temperature, even though swimming behavior was already present. However, at 12 °C, fry showed a delay in their development (i.e., lower levels of skeletal mineralization and energetic content) during the first growth phase, but they compensated during the second growth phase, reaching the same size in TL when compared with the other temperatures (4 and 6 °C); fry at 12 C° showed low energy reserves. Our study demonstrated that the use of an allometric analysis to identify different developmental stages coupled with a multitrait approach was more efficient than a classical distinction between biological stages (hatching, emergence, first food intake, and exogenous feeding), and this procedure is of interest when evaluating the impact of rearing conditions on early development in fish.

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