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Please use this identifier to cite or link to this item: http://hdl.handle.net/1993/260

Title: The effects of environment on catch and effort for the commercial fishery of Lake Winnipeg, Canada
Authors: Speers, Jeffery Duncan
Supervisor: Gillis, Darren (Zoology)
Examining Committee: Abrahams, Mark (Zoology) Kenkel, Norman (Botany)
Graduation Date: October 2006
Keywords: fish
walleye
sauger
weather
turbidity
satellite
catch
effort
MODIS
river
generalized linear models
wave
Issue Date: 12-Jul-2007
Abstract: Environmental factors affect fish distribution and fisher behavior. These factors are seldom included in stock assessment models, resulting in potentially inaccurate fish abundance estimates. This study determined the impact of these factors using the commercial catch rate of sauger (Sander canadensis) and walleye (Sander vitreus) in Lake Winnipeg by: (1) the use of satellite data to monitor turbidity and its impact on catch via simple linear regression and (2) the effect of environment on catch and effort using generalized linear models. No statistically significant relationship was found between catch and turbidity; a result which may be due to small sample sizes, the fish species' examined, and variable turbidity at depth. Decreased effort was correlated with harsh weather and decreased walleye catch. Increased walleye catch was correlated with low temperature and low Red River discharge. Increased sauger catch was correlated with high temperature, high cloud opacity, and average Red River discharge.
URI: http://hdl.handle.net/1993/260
Type: Electronic Thesis or Dissertation
Appears in Collection(s):FGS - Electronic Theses & Dissertations (Public)
Manitoba Heritage Theses

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