Distribution and movements of Atlantic cod in Placentia Bay, Newfoundland

Lawson, G. L. (1999) Distribution and movements of Atlantic cod in Placentia Bay, Newfoundland. Masters thesis, Memorial University of Newfoundland.

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    Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
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Abstract

This study investigates spatial and temporal variability in the distribution and movements of Atlantic cod (Gadus morhua L.) in Placentia Bay, Newfoundland, Canada, and consists of three components. First, a combination of acoustic and submersible surveys is used to reveal systematic variation in acoustic density estimates resulting from diel behavioural patterns of cod vertical movements and habitat associations. Second, acoustic measures of cod distribution demonstrate that cod spawn repeatedly at well-defined grounds in coastal Newfoundland, that the timing and intensity of spawning vary inter- and intra-annually, and that gender and age-related behaviours affect the composition of spawning shoals over time. Third, the within-year distribution and movement patterns of cod in Placentia Bay are studied using acoustic methods and mark-recapture experiments, documenting substantial migrations and a shift in depth-related distribution from the spring spawning to fall feeding period. This thesis reveals strong spatial and temporal trends in coastal cod distribution, demonstrating that acoustics can be effectively employed in the Newfoundland coastal environment. The observations provide evidence for the existence of a Placentia Bay cod stock.

Item Type: Thesis (Masters)
URI: http://research.library.mun.ca/id/eprint/1247
Item ID: 1247
Additional Information: Bibliography: leaves 123-124.
Department(s): Science, Faculty of > Biology
Date: 1999
Date Type: Submission
Geographic Location: Canada--Newfoundland and Labrador--Placentia Bay
Library of Congress Subject Heading: Atlantic cod--Seasonal distribution--Newfoundland and Labrador--Placentia Bay; Atlantic cod--Geographical distribution--Newfoundland and Labrador--Placentia Bay; Atlantic cod--Spawning--Newfoundland and Labrador--Placentia Bay; Fish stock assessment--Newfoundland and Labrador--Placentia Bay

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