Breadcrumb

 
 

Individual variability in activity patterns of juvenile Atlantic salmon (Salmo salar)

Title:

Individual variability in activity patterns of juvenile Atlantic salmon (Salmo salar)

Breau, Cindy (2003) Individual variability in activity patterns of juvenile Atlantic salmon (Salmo salar). Masters thesis, Concordia University.

[img]
Preview
PDF
1258Kb

Abstract

To describe the activity patterns of juvenile Atlantic salmon, I monitored the behaviour of 35 age-0+ (emerged from gravel in the spring) and eight age-1+ (emerged from gravel in the spring of the previous year) fish over an eight-week-summer field season. Active fish were visible on their home range whereas inactive fish were assumed to be sheltering. My data were consistent with the prediction of the Asset Protection Principle that larger individuals will take fewer chances in order to reduce risk of predation. Indeed, 1+ fish (larger and older) were more active at night than during the day, whereas 0+ fish were almost exclusively active during the day. In contrast to my expectations, however, daytime activity did not peak at the optimal water temperature of 17C̕ found in laboratory studies of other populations. Rather, the activity of 1+ fish peaked at 20.7C̕, whereas the activity of 0+ fish continued to increase until 23C̕ and then leveled off between 23-27C̕. Once individuals were active, season and light intensity were the variables that most influenced their foraging rate. There was considerable individual variability within an age-class in how fish responded to environmental variables. The causes of this individual variability and the consequences for growth deserve further study.

Divisions:Concordia University > Faculty of Arts and Science > Biology
Item Type:Thesis (Masters)
Authors:Breau, Cindy
Pagination:viii, 50 leaves : ill. ; 29 cm.
Institution:Concordia University
Degree Name:Theses (M.Sc.)
Program:Biology
Date:2003
Thesis Supervisor(s):Grant, James W. A
ID Code:1957
Deposited By:Concordia University Libraries
Deposited On:27 Aug 2009 13:23
Last Modified:08 Dec 2010 10:23
Related URLs:
All items in Spectrum are protected by copyright, with all rights reserved. The use of items is governed by Spectrum's terms of access.

Repository Staff Only: item control page

Document Downloads

More statistics for this item...

Concordia University - Footer