Movement and home range of brown trout, Salmo trutta Linnaeus, in the Aberfeldy River, Victoria

1980 ◽  
Vol 31 (6) ◽  
pp. 837 ◽  
Author(s):  
PD Jackson
Keyword(s):  
Home Range ◽  
Brown Trout ◽  
Age Structure ◽  
Salmo Trutta ◽  
Restricted Range ◽  
Main River ◽  
Brown Trout Salmo Trutta

Studies of the movement of marked brown trout in a section of the Aberfeldy River between 31 January 1972 and 6 February 1974 showed that the home range of 1 + and older trout was about 60 m of river; that of 0 + fish was about 370 m. Some fish strayed outside this restricted range. The age structure of trout populations in sections of the Aberfeldy River at different times of the year suggests that 0 + fish moved up-stream into small tributaries but did not spawn there. The trout probably spawned throughout the main river.

A comparison of the patterns of movement between indigenous and displaced brown trout (Salmo trutta L) in a small shallow loch

1978 ◽  
Vol 76 (4) ◽  
pp. 245-268 ◽  
Author(s):  
P. Tytler ◽  
D. Machin ◽  
F. G. T. Holliday ◽  
I. G. Priede
Keyword(s):  
Home Range ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Stochastic Simulations ◽  
Strong Preference ◽  
Frequency Distributions ◽  
Percentage Time ◽  
Brown Trout Salmo Trutta ◽  
Return Home ◽  
Ultrasonic Tracking

SynopsisThe patterns of movements of indigenous and displaced trout (Salmo trutta) in a small loch were obtained by ultrasonic tracking techniques. Comparisons of these were made by developing stochastic simulations of their movements based on an analysis of the frequency distributions of step lengths, angles of turn and the percentage time spent actively swimming.The dispersal and escape of displaced fish from an unfamiliar area of the loch can be explained principally in terms of random turning. Nose plugging appears to influence the distribution of the angles of turn without significantly altering the time taken to escape and return home.Indigenous trout show a strong preference for turns of 180°, indicating a tendency to turn in their tracks. Although a simulation of the indigenous fish shows slower dispersion than displaced fish, it is insufficient to explain the containment of movement within a home range. It is probable that successive steps are not independent and there may be some association between step lengths and subsequent angles of turn. The implications of their autocorrelation are discussed.

Movement and home range in relation to dominance; a telemetry study on brown trout Salmo trutta

2007 ◽  
Vol 70 (1) ◽  
pp. 257-268 ◽  
Author(s):  
J. Höjesjö ◽  
F. Økland ◽  
L. F. Sundström ◽  
J. Pettersson ◽  
J. I. Johnsson
Keyword(s):  
Home Range ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Brown Trout Salmo Trutta

scholarly journals Gillnet catchability of brown trout Salmo trutta is highly dependent on fish size and capture site

2019 ◽  
Vol 39 ◽  
pp. 30-38
Author(s):  
Reidar Borgstrøm ◽  
Knut Bergum ◽  
Trond Erik Børresen ◽  
Martin A. Svenning
Keyword(s):  
Brown Trout ◽  
Age Structure ◽  
Salmo Trutta ◽  
Habitat Type ◽  
Sampling Bias ◽  
Fish Populations ◽  
Fish Size ◽  
Small Lake ◽  
Related Variation ◽  
Brown Trout Salmo Trutta

Use of experimental gillnet fleets is common both in scientific studies of fish populations and in fishsampling for management purposes. Fish catchability may vary considerably with fish and gillnet meshsize, and catches obtained by gillnet fleets composed of nets with different mesh sizes may give lengthand age distributions that deviate considerably from the length and age structure of the population.We have estimated the absolute catchability of allopatric brown trout (Salmo trutta) in the littoral andpelagic habitat of a small lake based on a mark-recapture experiment. The brown trout catchabilityvaried considerably both with fish size and habitat type, probably due to a size-related variation inswimming distance per time unit and a size-related use of the different lentic habitats. The samplingbias in experimental gillnet fishing may be reduced by operating the gillnet fleets in all possible lentichabitats and most fundamentally, by use of catchability data obtained from populations with ‘known’length and age structures. By reducing this sampling bias, more realistic estimations of the age andlength distribution for a given population will be possible.

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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