Salmonid Habitats in Riverine Winter Conditions with Ice

Huusko, Ari; Vehanen, Teppo; Stickler, Morten

doi:10.1002/9781118526576.ch10

Cited by 5 publications

(7 citation statements)

References 110 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is possible that the cold winter conditions reduced the mortality rate, as endothermic predators could be limited in their choice of foraging grounds when parts of the stream are ice‐covered (Hurst ; Huusko et al. , ), which in turn may allow the trout to be more actively foraging. The ice‐protection effect is supported by studies showing that ice‐cover increases the willingness to forage, the swimming activity and the aggression, and reduces stress and ventilation rate in brown trout (Watz et al.…”

Section: Discussionmentioning

confidence: 99%

“…Recapture probability was likely relatively low because of low water temperatures during the spring electrofishing, but we assume that the relative recapture frequency is proportional to the survival rates and that the treatment groups have similar activity response to the low temperature. It is possible that the cold winter conditions reduced the mortality rate, as endothermic predators could be limited in their choice of foraging grounds when parts of the stream are ice-covered (Hurst 2007;Huusko et al 2007Huusko et al , 2013, which in turn may allow the trout to be more actively foraging. The ice-protection effect is supported by studies showing that ice-cover increases the willingness to forage, the swimming activity and the aggression, and reduces stress and ventilation rate in brown trout (Watz et al 2013a(Watz et al , 2015.…”

Section: Treatment Effects On Over-winter Performancementioning

confidence: 99%

“…For stream‐dwelling fish like salmonids, low water temperatures decrease the metabolism and reduce the scope for activity (Beamish ; Cunjak ; Huusko et al. , ; Brown et al. ).…”

Section: Introductionmentioning

confidence: 99%

“…Mortality likely depends on several interacting factors, such as ice formation, water temperature, discharge, shelter availability, predators, competition and food availability (Cunjak ; Hurst ; Huusko et al. , ). Furthermore, the individual state (e.g., body size and energy stores) likely influences the ability to survive the winter in salmonid fish (Biro et al.…”

Section: Introductionmentioning

confidence: 99%

“…Winter conditions in boreal and temperate regions can constitute challenges for many organisms. For stream-dwelling fish like salmonids, low water temperatures decrease the metabolism and reduce the scope for activity (Beamish 1978;Cunjak 1996;Huusko et al 2007Huusko et al , 2013Brown et al 2011). Furthermore, the input of allochthonous food is low during this period due to low activity of terrestrial invertebrates (French et al 2014), and the rate of food digestion and capacity of capturing drifting food are reduced at low temperatures (Elliott 1972;Watz et al 2013bWatz et al , 2014.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Autumn food restriction reduces smoltification rate, but not over‐winter survival, in juvenile brown trout Salmo trutta

Näslund

Sundström

Johnsson

2015

Ecology of Freshwater Fish

View full text Add to dashboard Cite

The winter is often considered as a survival bottleneck for stream-living fish. Juvenile salmonids generally become less active during this period, and while food intake continues to some extent, growth rates are typically low. Here we present the results of an over-winter field experiment where energy levels were manipulated in late autumn. Three groups of juvenile (age 1+) brown trout, from an anadromous population, were monitored with respect to over-winter growth rate and survival (as indicated by recapture rates). Two groups were fed either high (HR), or low (LR) food rations in the laboratory for a month (October); the third group remained in the stream (STR). Over-winter growth rates were relatively low in all groups, and no growth compensation could be detected. Compared to HR and LR, STR fish had higher recapture rates after winter, indicating that laboratory housing may have affected the subsequent stream survival negatively. Comparing the two laboratory-housed groups, the LR group reached similar condition as the HR group in early spring, without indications of differences in survival. However, the initiation rate of body silvering (indicating initiation of smoltification) was lower in the LR group.Thus, it appears that food restriction during late autumn affect the onset of smoltification in juvenile brown trout. The results support previous laboratory studies indicating that salmonids modify their over-winter foraging behaviour to avoid too low energy levels at the end of winter. This modification appears to delay smoltification, but may not necessarily be costly in terms of over-winter mortality.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Treatment Effects On Over-winter Performancementioning

confidence: 99%

“…For stream‐dwelling fish like salmonids, low water temperatures decrease the metabolism and reduce the scope for activity (Beamish ; Cunjak ; Huusko et al. , ; Brown et al. ).…”

Section: Introductionmentioning

confidence: 99%