Hatch date and 0-group growth rate comparisons for cod (Gadus morhua) in Newfoundland waters : support for the match hypothesis
Thesis (M.Sc.)--Memorial University of Newfoundland, 1995. Biology Bibliography: leaves 57-64. Lapillus otoliths of 0-group cod (Gadus morhua) were used to determine the day of hatching and length at age of individuals collected along the northeast coast of Newfoundland and on the southern Grand Ban...
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ftmemorialunivdc:oai:collections.mun.ca:theses2/200161 2023-05-15T15:27:07+02:00 Hatch date and 0-group growth rate comparisons for cod (Gadus morhua) in Newfoundland waters : support for the match hypothesis Pinsent, David L., 1965- Memorial University of Newfoundland. Dept. of Biology Canada--Newfoundland and Labrador 1995 viii, 76 leaves : ill., maps. Image/jpeg; Application/pdf http://collections.mun.ca/cdm/ref/collection/theses2/id/200161 Eng eng Electronic Theses and Dissertations (8.50 MB) -- http://collections.mun.ca/PDFs/theses/Pinsent_DavidL.pdf 76245798 http://collections.mun.ca/cdm/ref/collection/theses2/id/200161 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. Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries Atlantic cod--Newfoundland and Labrador--Spawning Atlantic cod--Newfoundland and Labrador--Larvae Atlantic cod--Newfoundland and Labrador--Growth Text Electronic thesis or dissertation 1995 ftmemorialunivdc 2015-08-06T19:17:16Z Thesis (M.Sc.)--Memorial University of Newfoundland, 1995. Biology Bibliography: leaves 57-64. Lapillus otoliths of 0-group cod (Gadus morhua) were used to determine the day of hatching and length at age of individuals collected along the northeast coast of Newfoundland and on the southern Grand Bank in 1989 and 1991. Spatial pattern in the distribution of hatch dates was examined for latitudinal trends analogous to those of the spawning times in the area. Length at age analysis allowed the identification of specific areas and times where 0-group growth was greatest. -- Geographic distribution of cod hatching dates is neither consistently synchronous nor sequential in Newfoundland waters. A homogeneous pattern of hatch date distributions existed from the northeast coast of Newfoundland to southern Grand Bank in 1989, a year with average spring and summer water temperatures. In contrast, hatching dates during 1991, a year with below average spring and summer temperatures, exhibited a latitudinal progression from south to north. Hatching in the early part of a site-specific distribution resulted in first-feeding-larvae emerging at the onset of Calanus peak abundance. These larvae were characterized by a prolonged period of relatively slow growth. Those which began feeding later maintained rapid instantaneous growth for a short period. The result was that slower-growing, "early" larvae were actually larger than faster growing, "later" feeding larvae, by the end of their first year. Consequently, those that hatch early achieve a larger size at the end of one year. Thesis atlantic cod Gadus morhua Newfoundland studies University of Newfoundland Memorial University of Newfoundland: Digital Archives Initiative (DAI) Canada Newfoundland |
institution |
Open Polar |
collection |
Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
op_collection_id |
ftmemorialunivdc |
language |
English |
topic |
Atlantic cod--Newfoundland and Labrador--Spawning Atlantic cod--Newfoundland and Labrador--Larvae Atlantic cod--Newfoundland and Labrador--Growth |
spellingShingle |
Atlantic cod--Newfoundland and Labrador--Spawning Atlantic cod--Newfoundland and Labrador--Larvae Atlantic cod--Newfoundland and Labrador--Growth Pinsent, David L., 1965- Hatch date and 0-group growth rate comparisons for cod (Gadus morhua) in Newfoundland waters : support for the match hypothesis |
topic_facet |
Atlantic cod--Newfoundland and Labrador--Spawning Atlantic cod--Newfoundland and Labrador--Larvae Atlantic cod--Newfoundland and Labrador--Growth |
description |
Thesis (M.Sc.)--Memorial University of Newfoundland, 1995. Biology Bibliography: leaves 57-64. Lapillus otoliths of 0-group cod (Gadus morhua) were used to determine the day of hatching and length at age of individuals collected along the northeast coast of Newfoundland and on the southern Grand Bank in 1989 and 1991. Spatial pattern in the distribution of hatch dates was examined for latitudinal trends analogous to those of the spawning times in the area. Length at age analysis allowed the identification of specific areas and times where 0-group growth was greatest. -- Geographic distribution of cod hatching dates is neither consistently synchronous nor sequential in Newfoundland waters. A homogeneous pattern of hatch date distributions existed from the northeast coast of Newfoundland to southern Grand Bank in 1989, a year with average spring and summer water temperatures. In contrast, hatching dates during 1991, a year with below average spring and summer temperatures, exhibited a latitudinal progression from south to north. Hatching in the early part of a site-specific distribution resulted in first-feeding-larvae emerging at the onset of Calanus peak abundance. These larvae were characterized by a prolonged period of relatively slow growth. Those which began feeding later maintained rapid instantaneous growth for a short period. The result was that slower-growing, "early" larvae were actually larger than faster growing, "later" feeding larvae, by the end of their first year. Consequently, those that hatch early achieve a larger size at the end of one year. |
author2 |
Memorial University of Newfoundland. Dept. of Biology |
format |
Thesis |
author |
Pinsent, David L., 1965- |
author_facet |
Pinsent, David L., 1965- |
author_sort |
Pinsent, David L., 1965- |
title |
Hatch date and 0-group growth rate comparisons for cod (Gadus morhua) in Newfoundland waters : support for the match hypothesis |
title_short |
Hatch date and 0-group growth rate comparisons for cod (Gadus morhua) in Newfoundland waters : support for the match hypothesis |
title_full |
Hatch date and 0-group growth rate comparisons for cod (Gadus morhua) in Newfoundland waters : support for the match hypothesis |
title_fullStr |
Hatch date and 0-group growth rate comparisons for cod (Gadus morhua) in Newfoundland waters : support for the match hypothesis |
title_full_unstemmed |
Hatch date and 0-group growth rate comparisons for cod (Gadus morhua) in Newfoundland waters : support for the match hypothesis |
title_sort |
hatch date and 0-group growth rate comparisons for cod (gadus morhua) in newfoundland waters : support for the match hypothesis |
publishDate |
1995 |
url |
http://collections.mun.ca/cdm/ref/collection/theses2/id/200161 |
op_coverage |
Canada--Newfoundland and Labrador |
geographic |
Canada Newfoundland |
geographic_facet |
Canada Newfoundland |
genre |
atlantic cod Gadus morhua Newfoundland studies University of Newfoundland |
genre_facet |
atlantic cod Gadus morhua Newfoundland studies University of Newfoundland |
op_source |
Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries |
op_relation |
Electronic Theses and Dissertations (8.50 MB) -- http://collections.mun.ca/PDFs/theses/Pinsent_DavidL.pdf 76245798 http://collections.mun.ca/cdm/ref/collection/theses2/id/200161 |
op_rights |
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. |
_version_ |
1766357571577315328 |