Food availability and growth rate in natural populations of the brown trout (Salmo trutta) in Corsican streams

Hydrobiologia ◽  
1996 ◽  
Vol 331 (1-3) ◽  
pp. 63-69 ◽  
Author(s):  
Remi Chappaz ◽  
Georges Olivart ◽  
Guy Brun
Keyword(s):  
Growth Rate ◽  
Food Availability ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Natural Populations ◽  
Brown Trout Salmo Trutta

scholarly journals Food availability in spring affects smolting in brown trout (Salmo trutta)

2015 ◽  
Vol 72 (11) ◽  
pp. 1694-1699 ◽  
Author(s):  
Douglas A. Jones ◽  
Eva Bergman ◽  
Larry Greenberg
Keyword(s):  
Seasonal Variation ◽  
Food Availability ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Morphological Changes ◽  
Salmonid Fish ◽  
Fish Growth ◽  
Brown Trout Salmo Trutta ◽  
Previous Autumn

Prior to out-migration, salmonid fish typically undergo physiological and morphological changes — a process known as smolting. This study indicates that smolting in brown trout (Salmo trutta) is affected by feeding conditions in spring immediately prior to out-migration. This conclusion was reached after experimentally testing the effect of seasonal variation in food availability on smolt status in the spring. A migratory strain of trout was administered either high or low food rations in the autumn, winter, or spring prior to release in the spring. While fish growth or condition could be affected in any season, it was spring rationing that reduced growth and growth-related variables and that caused increased smolting. Our result supports the idea that smoltification and the decision to migrate is affected by spring food availability regardless of conditions in the previous autumn or winter.

Longevity, Body Size, and Growth in Anadromous Brown Trout (Salmo trutta)

1991 ◽  
Vol 48 (10) ◽  
pp. 1838-1845 ◽  
Author(s):  
Bror Jonsson ◽  
Jan Henning L'Abée-Lund ◽  
Tor G. Heggberget ◽  
Arne J. Jensen ◽  
Bjørn O. Johnsen ◽  
...  
Keyword(s):  
Growth Rate ◽  
Body Size ◽  
Water Temperature ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Ambient Water ◽  
Ambient Water Temperature ◽  
Brown Trout Salmo Trutta ◽  
Interpopulation Variation ◽  
Temperature And Growth

Longevity in 25 populations of anadromous brown trout (Salmo trutta) showed a significant trend with increasing life span at latitudes of 58–70°N in Norway, with the largest change from 58 to 60°N. Moreover, longevity was negatively correlated with temperature and growth rate in freshwater and at sea. Body size was negatively correlated with water temperature and growth rate in freshwater, but not with latitude or water temperature and growth rate at sea. Thus, conditions influencing development and metabolic rates in fresh water seem more important than conditions in the sea in determining variation in longevity and body size of anadromous brown trout. Our results support the hypothesis that interpopulation variation in longevity and body size is influenced by rate of metabolism, chiefly influenced by ambient water temperature.

Effect of Feeding Brown Trout (Salmo trutta) a Diet Pelleted in Dry and Moist Forms

1974 ◽  
Vol 31 (11) ◽  
pp. 1824-1826 ◽  
Author(s):  
Hugh A. Poston
Keyword(s):  
Growth Rate ◽  
Body Composition ◽  
Energy Density ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Dry Matter ◽  
High Moisture ◽  
Brown Trout Salmo Trutta ◽  
Juvenile Brown Trout ◽  
Effect Of Feeding

Growth rate, body composition, and intake of either dry matter or energy did not differ significantly (P > 0.05) between two groups of juvenile brown trout (Salmo trutta) fed either a low- or high-moisture semipurified diet at different rates to compensate for a diet energy density gradient. Feed/gain efficiency, on an as-fed basis, was significantly greater (P < 0.01) in fish fed the low-moisture diet, but did not differ (P > 0.05) when compared on the basis of dry matter or energy intake.

scholarly journals No additive genetic variance for tolerance to ethynylestradiol exposure in natural populations of brown trout ( Salmo trutta )

2019 ◽  
Vol 12 (5) ◽  
pp. 940-950 ◽  
Author(s):  
Lucas Marques da Cunha ◽  
Anshu Uppal ◽  
Emily Seddon ◽  
David Nusbaumer ◽  
Etienne L.M. Vermeirssen ◽  
...  
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Genetic Variance ◽  
Additive Genetic Variance ◽  
Natural Populations ◽  
Brown Trout Salmo Trutta

Comparison of Actual and Potential Growth Rates of Brown Trout (Salmo trutta) in Natural Streams Based on Bioenergetic Models

1989 ◽  
Vol 46 (6) ◽  
pp. 1067-1076 ◽  
Author(s):  
Richard J. Preall ◽  
Neil H. Ringler
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Specific Growth ◽  
Maximum Growth ◽  
Maximum Growth Rate ◽  
Dominant Feature ◽  
Natural Streams ◽  
Brown Trout Salmo Trutta

A ratio of specific growth rate to predicted maximum growth rate was employed as an ecological growth coefficient (EGC) in identifying major determinants of growth for brown trout, Salmo trutta, in natural streams. The coefficient may be more useful than specific growth rate when comparing trout populations from streams having diverse characteristics, since it accounts for the quantitative effects of stream temperature and mean trout weight. The maximum growth rate was generated by translating Elliott's bioenergetic equations into computer models applicable to fish weighing 5–300 g and to stream temperatures of 3.8–21.7 °C. EQMAX is the simpler model and generates only maximum growth rate. TROUT estimates the maximum ration size, maximum growth rate, and a variety of bioenergetic parameters. The EGC for Age I + trout ranged from 60 to 90% in three central New York streams. A relatively low EGC (30–60%) observed for Age II + trout in one stream may have been due to the inefficiency of feeding on small invertebrates. Temperature appears to be a dominant feature governing trout growth in streams. The bioenergetic models may provide useful predictions of the effects of foraging on prey communities by brown trout.

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