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Theses Canada
Item – Theses Canada
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Item – Theses Canada
OCLC number
1267976498
Link(s) to full text
LAC copy
LAC copy
Author
Moore, Tina Mae,1972-
Title
Population characteristics of the spiny dogfish, Squalus acanthias Linnaeus, 1758, from geographically distinct locations in Atlantic Canada during the summer and fall of 1996.
Degree
M. Sc. -- Acadia University, 1998
Publisher
Wolfville, Nova Scotia : Acadia University, 1998.
Description
1 online resource
Notes
Includes bibliographical references.
Abstract
A total of 1684 dogfish were sampled to determine population characteristics from three regions in Atlantic Canada: the Minas Basin, the outer Bay of Fundy, and the Gulf of St. Lawrence. The posterior dorsal spine was removed from 211 male and 475 female dogfish for ageing. Ages were determined from the spines and annuli lost to wear were calculated using a spine dimension standardized equation. This study was the first attempt to define a complete reproductive stage assessment of a shark. A total of 475 females had the reproductive tracts removed and categorized as one of six stages. The Minas Basin sample exhibited the highest number of reproductively mature females (56.1%) and female dogfish captured in the outer Bay of Fundy were predominantly immature (97.6%). Maturity for 50% of female dogfish in Atlantic Canada was calculated at 17 years of age and a total length of 83.4 cm. Male dogfish age and total length were similar between the three regions but only 11 male dogfish were taken during the entire season in the Minas Basin (male:female ratio; 1:99). The Minas Basin female dogfish were significantly larger, older, and more mature than females in the other two sampling locations. Few comprehensive studies exist on spiny dogfish in the Northwest Atlantic because it is has only recently been commercially exploited. If commercial exploitation of dogfish were to begin in Atlantic Canada it would be more economically and biologically successful as a bycatch fish with other fisheries.
Other link(s)
scholar.acadiau.ca
Subject
LE3 .A278 1998
ISBN
0612338231
9780612338234
Date modified:
2022-09-01