Seasonal trends in spawning condition and catch rates of Atlantic cod (Gadus morhua) in northern Placentia Bay, Newfoundland, over 1995-1999
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...
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Memorial University of Newfoundland
1999
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ftmemorialuniv:oai:research.library.mun.ca:957 2023-10-01T03:54:31+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. 1999 application/pdf https://research.library.mun.ca/957/ https://research.library.mun.ca/957/1/Bolon_AlineDP.pdf https://research.library.mun.ca/957/3/Bolon_AlineDP.pdf en eng Memorial University of Newfoundland https://research.library.mun.ca/957/1/Bolon_AlineDP.pdf https://research.library.mun.ca/957/3/Bolon_AlineDP.pdf Bolon, Aline D. P. <https://research.library.mun.ca/view/creator_az/Bolon=3AAline_D=2E_P=2E=3A=3A.html> (1999) Seasonal trends in spawning condition and catch rates of Atlantic cod (Gadus morhua) in northern Placentia Bay, Newfoundland, over 1995-1999. Masters thesis, Memorial University of Newfoundland. thesis_license Thesis NonPeerReviewed 1999 ftmemorialuniv 2023-09-03T06:44:09Z 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 Memorial University of Newfoundland: Research Repository |
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Memorial University of Newfoundland: Research Repository |
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ftmemorialuniv |
language |
English |
description |
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. |
format |
Thesis |
author |
Bolon, Aline D. P. |
spellingShingle |
Bolon, Aline D. P. Seasonal trends in spawning condition and catch rates of Atlantic cod (Gadus morhua) in northern Placentia Bay, Newfoundland, over 1995-1999 |
author_facet |
Bolon, Aline D. P. |
author_sort |
Bolon, Aline D. P. |
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 |
publisher |
Memorial University of Newfoundland |
publishDate |
1999 |
url |
https://research.library.mun.ca/957/ https://research.library.mun.ca/957/1/Bolon_AlineDP.pdf https://research.library.mun.ca/957/3/Bolon_AlineDP.pdf |
genre |
atlantic cod Gadus morhua Newfoundland |
genre_facet |
atlantic cod Gadus morhua Newfoundland |
op_relation |
https://research.library.mun.ca/957/1/Bolon_AlineDP.pdf https://research.library.mun.ca/957/3/Bolon_AlineDP.pdf Bolon, Aline D. P. <https://research.library.mun.ca/view/creator_az/Bolon=3AAline_D=2E_P=2E=3A=3A.html> (1999) Seasonal trends in spawning condition and catch rates of Atlantic cod (Gadus morhua) in northern Placentia Bay, Newfoundland, over 1995-1999. Masters thesis, Memorial University of Newfoundland. |
op_rights |
thesis_license |
_version_ |
1778522267593998336 |