Seasonal trends in spawning condition and catch rates of Atlantic cod (Gadus morhua) in northern Placentia Bay, Newfoundland, over 1995-1999
Thesis (M.Sc.)--Memorial University of Newfoundland, 1999. Biopsychology Bibliography: leaves 135-141 To describe the temporal spawning of cod and its relation to water temperature, sexual maturity, length, and age, the condition and gonado-somatic index of Atlantic cod sampled at four sites in nort...
Main Author: | |
---|---|
Other Authors: | |
Format: | Thesis |
Language: | English |
Published: |
1999
|
Subjects: | |
Online Access: | http://collections.mun.ca/cdm/ref/collection/theses3/id/49272 |
id |
ftmemorialunivdc:oai:collections.mun.ca:theses3/49272 |
---|---|
record_format |
openpolar |
spelling |
ftmemorialunivdc:oai:collections.mun.ca:theses3/49272 2023-05-15T15:26:53+02:00 Seasonal trends in spawning condition and catch rates of Atlantic cod (Gadus morhua) in northern Placentia Bay, Newfoundland, over 1995-1999 Bolon, Aline D. P., 1971- Memorial University of Newfoundland. Biopsychology Programme Canada--Newfoundland and Labrador--Placentia Bay 1999 xiv, 160 leaves : ill. (some col.), maps Image/jpeg; Application/pdf http://collections.mun.ca/cdm/ref/collection/theses3/id/49272 eng eng Electronic Theses and Dissertations (35.23 MB) -- http://collections.mun.ca/PDFs/theses/Bolon_AlineDP.pdf a1392838 http://collections.mun.ca/cdm/ref/collection/theses3/id/49272 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--Spawning--Newfoundland and Labrador--Placentia Bay Atlantic cod--Seasonal distribution--Newfoundland and Labrador--Placentia Bay;Fisheries--Catch effort--Newfoundland and Labrador--Placentia Bay Text Electronic thesis or dissertation 1999 ftmemorialunivdc 2015-08-06T19:17:53Z Thesis (M.Sc.)--Memorial University of Newfoundland, 1999. Biopsychology Bibliography: leaves 135-141 To describe the temporal spawning of cod and its relation to water temperature, sexual maturity, length, and age, the condition and gonado-somatic index of Atlantic cod sampled at four sites in northern Placentia Bay were monitored from March 1998 to April 1999. Similar information collected by the Department of Fisheries and Oceans over 1995-1997 was added to this data set. A histological procedure was used to verify spawning condition and improve the visual classification of spawning females. The visual classification was found to underestimate the percentage of spawning females by up to 29.7 %. No significant differences of biological variables and temperatures were found among the four fishing locations. Spawning fish were present from March to August, and several peak spawning periods per year were observed. A correlation between spawning patterns and temperature existed, but with a difference between sexes. Catch per unit effort, which gave a representative image of movement and abundance of fish, was more important in fixed than free locations, and was low during the spawning season. 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--Spawning--Newfoundland and Labrador--Placentia Bay Atlantic cod--Seasonal distribution--Newfoundland and Labrador--Placentia Bay;Fisheries--Catch effort--Newfoundland and Labrador--Placentia Bay |
spellingShingle |
Atlantic cod--Spawning--Newfoundland and Labrador--Placentia Bay Atlantic cod--Seasonal distribution--Newfoundland and Labrador--Placentia Bay;Fisheries--Catch effort--Newfoundland and Labrador--Placentia Bay Bolon, Aline D. P., 1971- Seasonal trends in spawning condition and catch rates of Atlantic cod (Gadus morhua) in northern Placentia Bay, Newfoundland, over 1995-1999 |
topic_facet |
Atlantic cod--Spawning--Newfoundland and Labrador--Placentia Bay Atlantic cod--Seasonal distribution--Newfoundland and Labrador--Placentia Bay;Fisheries--Catch effort--Newfoundland and Labrador--Placentia Bay |
description |
Thesis (M.Sc.)--Memorial University of Newfoundland, 1999. Biopsychology Bibliography: leaves 135-141 To describe the temporal spawning of cod and its relation to water temperature, sexual maturity, length, and age, the condition and gonado-somatic index of Atlantic cod sampled at four sites in northern Placentia Bay were monitored from March 1998 to April 1999. Similar information collected by the Department of Fisheries and Oceans over 1995-1997 was added to this data set. A histological procedure was used to verify spawning condition and improve the visual classification of spawning females. The visual classification was found to underestimate the percentage of spawning females by up to 29.7 %. No significant differences of biological variables and temperatures were found among the four fishing locations. Spawning fish were present from March to August, and several peak spawning periods per year were observed. A correlation between spawning patterns and temperature existed, but with a difference between sexes. Catch per unit effort, which gave a representative image of movement and abundance of fish, was more important in fixed than free locations, and was low during the spawning season. |
author2 |
Memorial University of Newfoundland. Biopsychology Programme |
format |
Thesis |
author |
Bolon, Aline D. P., 1971- |
author_facet |
Bolon, Aline D. P., 1971- |
author_sort |
Bolon, Aline D. P., 1971- |
title |
Seasonal trends in spawning condition and catch rates of Atlantic cod (Gadus morhua) in northern Placentia Bay, Newfoundland, over 1995-1999 |
title_short |
Seasonal trends in spawning condition and catch rates of Atlantic cod (Gadus morhua) in northern Placentia Bay, Newfoundland, over 1995-1999 |
title_full |
Seasonal trends in spawning condition and catch rates of Atlantic cod (Gadus morhua) in northern Placentia Bay, Newfoundland, over 1995-1999 |
title_fullStr |
Seasonal trends in spawning condition and catch rates of Atlantic cod (Gadus morhua) in northern Placentia Bay, Newfoundland, over 1995-1999 |
title_full_unstemmed |
Seasonal trends in spawning condition and catch rates of Atlantic cod (Gadus morhua) in northern Placentia Bay, Newfoundland, over 1995-1999 |
title_sort |
seasonal trends in spawning condition and catch rates of atlantic cod (gadus morhua) in northern placentia bay, newfoundland, over 1995-1999 |
publishDate |
1999 |
url |
http://collections.mun.ca/cdm/ref/collection/theses3/id/49272 |
op_coverage |
Canada--Newfoundland and Labrador--Placentia Bay |
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 (35.23 MB) -- http://collections.mun.ca/PDFs/theses/Bolon_AlineDP.pdf a1392838 http://collections.mun.ca/cdm/ref/collection/theses3/id/49272 |
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_ |
1766357353724116992 |