scholarly journals Daytime habitat selection for juvenile parr brown trout (Salmo trutta) in small lowland streams

2014 ◽  
pp. 09 ◽  
Author(s):  
J. Conallin ◽  
E. Boegh ◽  
M. Olsen ◽  
S. Pedersen ◽  
M.J. Dunbar ◽  
...  
Keyword(s):  
Habitat Selection ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Lowland Streams ◽  
Brown Trout Salmo Trutta ◽  
Selection For

Selection for Growth Potential among Migratory Brown Trout (Salmo trutta) Fry Competing for Territories: Evidence from Otoliths

1991 ◽  
Vol 48 (1) ◽  
pp. 19-27 ◽  
Author(s):  
Robert G. Titus ◽  
Henrik Mosegaard
Keyword(s):  
Brown Trout ◽  
Behavioral Ecology ◽  
Salmo Trutta ◽  
Growth Potential ◽  
Otolith Microstructure ◽  
Territorial Aggression ◽  
Clear Cut ◽  
Brown Trout Salmo Trutta ◽  
Selection For ◽  
Otolith Size

Otolith microstructure analysis was employed to determine differential size and growth characteristics between newly emerged migratory brown trout (Salmo trutta) fry which establish feeding territories and those which are forced to move downstream from the redd. Fry size at emergence was poorly predicted by otolith size, which precluded reliable back-calculation of fry size to investigate a possible size-selection mechanism. However, there was a clear-cut selection for individuals with significantly larger otoliths at emergence among fry which established territories in artificial stream sections. This selection pattern commenced with the onset of territorial aggression between fry. Fry which established territories to the end of the experiment had significantly higher initial otolith growth rates than emigrating fry, and their dry weights at the end of the experiment were well predicted by both otolith size at emergence and otolith size at the end of the experiment. Transparent zones in otoliths from downstream migrants suggested that these fry were starved; this was also supported by their declining dry weights over time. These results were explained as selection for greater growth potential as based on a proposed coupling between otolith microstructure formation and fish metabolism and on the behavioral ecology of migratory brown trout fry.

scholarly journals Enhanced individual selection for selecting fast growing fish: the "PROSPER" method, with application on brown trout (Salmo trutta fario)

2004 ◽  
Vol 36 (6) ◽  
pp. 643 ◽  
Author(s):  
Bernard Chevassus ◽  
Edwige Quillet ◽  
Francine Krieg ◽  
Marie-Gwénola Hollebecq ◽  
Muriel Mambrini ◽  
...  
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Individual Selection ◽  
Fast Growing ◽  
Brown Trout Salmo Trutta ◽  
Selection For ◽  
Salmo Trutta Fario

The ontogenetic development of body segments and sexual dimorphism in brown trout (Salmo trutta L.)

1997 ◽  
Vol 75 (4) ◽  
pp. 651-655 ◽  
Author(s):  
F. G. Reyes-Gavilán ◽  
A. F. Ojanguren ◽  
F. Braña
Keyword(s):  
Body Size ◽  
Sexual Dimorphism ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Head Length ◽  
Northern Spain ◽  
Morphometric Traits ◽  
Brown Trout Salmo Trutta ◽  
Selection For ◽  
Mature Fish

Nonmigratory brown trout (Salmo trutta L.) from northern Spain showed no between-sex differences in total length or mass and only moderate, but significant, dimorphism in some morphometric traits. The main dimorphic features were the sizes of the abdomen (larger in females) and head (larger in males, including the upper jaw), relative to each other and also to the post-anal length, the latter being considered a control for body size. Least-squares linear regressions of head length on abdomen length were homogeneous in both the slopes and the intercepts for immature fish of both sexes, but mature males exhibited significantly steeper slopes than mature females. Within each sex the slopes for immature and mature fish were homogeneous, and mature fish of both sexes had higher intercepts than immature ones. Therefore, immature individuals were monomorphic and mature individuals of both sexes diverged from the juvenile pattern, each in a particular fashion: males acquired a greater relative head length (particularly a longer jaw) and females a greater relative abdomen length. Sexual selection for larger head size relative to body size in males and fecundity selection for larger abdomen size relative to body size in females are hypothesized to be important in the evolution of sexual dimorphism in brown trout.

Resistance of erythrocytes from Brown trout (Salmo trutta m. trutta L.) affected by ulcerative dermal necrosis syndrome

2011 ◽  
Vol 14 (3) ◽  
pp. 443-448 ◽  
Author(s):  
N. Kurhalyuk ◽  
H. Tkachenko ◽  
K. Pałczyńska
Keyword(s):  
Oxidative Stress ◽  
Lipid Peroxidation ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Thiobarbituric Acid ◽  
Control Group ◽  
Thiobarbituric Acid Reactive Substance ◽  
Tbars Level ◽  
Reactive Substance ◽  
Brown Trout Salmo Trutta

Resistance of erythrocytes from Brown trout (Salmo trutta m. trutta L.) affected by ulcerative dermal necrosis syndrome In the present work we evaluated the effect of ulcerative dermal necrosis (UDN) syndrome on resistance of erythrocytes to haemolytic agents and lipid peroxidation level in the blood from brown trout (Salmo trutta m. trutta L.). Results showed that lipid peroxidation increased in erythrocytes, as evidenced by high thiobarbituric acid reactive substance (TBARS) levels. Compared to control group, the resistance of erythrocytes to haemolytic agents was significantly lower in UDN-positive fish. Besides, UDN increased the percent of hemolysated erythrocytes subjected to the hydrochloric acid, urea and hydrogen peroxide. Results showed that UDN led to an oxidative stress in erythrocytes able to induce enhanced lipid peroxidation level, as suggested by TBARS level and decrease of erythrocytes resistance to haemolytic agents.

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