Genetic and environmental factors affecting growth, physiology and reproductive patterns in two forms of Atlantic salmon Salmo salar (Linnaeus) 1758, in Newfoundland
Thesis (M.Sc.)--Memorial University of Newfoundland, 1985. Biology Bibliography: leaves 103-115. Newfoundland has numerous populations of landlocked Atlantic salmon (Salmo salar). Several of these populations are stunted, exhibiting a marked reduction in size at any age compared with other anadromou...
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ftmemorialunivdc:oai:collections.mun.ca:theses2/46356 2023-05-15T15:29:57+02:00 Genetic and environmental factors affecting growth, physiology and reproductive patterns in two forms of Atlantic salmon Salmo salar (Linnaeus) 1758, in Newfoundland MacLean, Donald A. Memorial University of Newfoundland. Dept. of Biology 1984 xi, 115 leaves : ill. Image/jpeg; Application/pdf http://collections.mun.ca/cdm/ref/collection/theses2/id/46356 Eng eng Electronic Theses and Dissertations (15.76 MB) -- http://collections.mun.ca/PDFs/theses/Maclean_DonaldA.pdf 75332327 http://collections.mun.ca/cdm/ref/collection/theses2/id/46356 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 salmon Ouananiche Text Electronic thesis or dissertation 1984 ftmemorialunivdc 2015-08-06T19:16:35Z Thesis (M.Sc.)--Memorial University of Newfoundland, 1985. Biology Bibliography: leaves 103-115. Newfoundland has numerous populations of landlocked Atlantic salmon (Salmo salar). Several of these populations are stunted, exhibiting a marked reduction in size at any age compared with other anadromous and landlocked populations. A population of stunted landlocked salmon from 5 Mile Pond East on the Avalon Peninsula was investigated. Data collected on ecology and life history reveal the population to be an extremely slow-growing, short lived form of Atlantic salmon. -- Anadromous and landlocked Atlantic salmon examined at the smolt stage revealed a difference in the degree of smoltification and salinity tolerance exhibited by the two forms. Anadromous fish had a decrease in lipid, increase in water content and the increased salinity tolerance characteristic of true smolts. While wild landlocked 5 Mile Pond East fish experienced a similar reduction in lipid and increase in water, neither they, nor cultured landlocked salmon survived a challenge to sea water. -- The two pure lines and the reciprocal hybrids between the early maturing stunted 5 Mile Pond East fish and a later maturing anadromous form were reared in the laboratory for a period of 2.5 years. Ninety percent of female parr of the dwarf landlocked strain matured at age 2+ while no females of the anadromous form matured at this time. Ovary weight differed in the two pure forms at age 0+ and the numbers, size and stages of previtellogenic oocytes also differed at age 1+. Ovarian patterns of development and the time of onset of sexual maturation in the two hybrid forms appeared intermediate to that of the parental forms. Thesis Atlantic salmon Newfoundland studies Salmo salar University of Newfoundland Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
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Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
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ftmemorialunivdc |
language |
English |
topic |
Atlantic salmon Ouananiche |
spellingShingle |
Atlantic salmon Ouananiche MacLean, Donald A. Genetic and environmental factors affecting growth, physiology and reproductive patterns in two forms of Atlantic salmon Salmo salar (Linnaeus) 1758, in Newfoundland |
topic_facet |
Atlantic salmon Ouananiche |
description |
Thesis (M.Sc.)--Memorial University of Newfoundland, 1985. Biology Bibliography: leaves 103-115. Newfoundland has numerous populations of landlocked Atlantic salmon (Salmo salar). Several of these populations are stunted, exhibiting a marked reduction in size at any age compared with other anadromous and landlocked populations. A population of stunted landlocked salmon from 5 Mile Pond East on the Avalon Peninsula was investigated. Data collected on ecology and life history reveal the population to be an extremely slow-growing, short lived form of Atlantic salmon. -- Anadromous and landlocked Atlantic salmon examined at the smolt stage revealed a difference in the degree of smoltification and salinity tolerance exhibited by the two forms. Anadromous fish had a decrease in lipid, increase in water content and the increased salinity tolerance characteristic of true smolts. While wild landlocked 5 Mile Pond East fish experienced a similar reduction in lipid and increase in water, neither they, nor cultured landlocked salmon survived a challenge to sea water. -- The two pure lines and the reciprocal hybrids between the early maturing stunted 5 Mile Pond East fish and a later maturing anadromous form were reared in the laboratory for a period of 2.5 years. Ninety percent of female parr of the dwarf landlocked strain matured at age 2+ while no females of the anadromous form matured at this time. Ovary weight differed in the two pure forms at age 0+ and the numbers, size and stages of previtellogenic oocytes also differed at age 1+. Ovarian patterns of development and the time of onset of sexual maturation in the two hybrid forms appeared intermediate to that of the parental forms. |
author2 |
Memorial University of Newfoundland. Dept. of Biology |
format |
Thesis |
author |
MacLean, Donald A. |
author_facet |
MacLean, Donald A. |
author_sort |
MacLean, Donald A. |
title |
Genetic and environmental factors affecting growth, physiology and reproductive patterns in two forms of Atlantic salmon Salmo salar (Linnaeus) 1758, in Newfoundland |
title_short |
Genetic and environmental factors affecting growth, physiology and reproductive patterns in two forms of Atlantic salmon Salmo salar (Linnaeus) 1758, in Newfoundland |
title_full |
Genetic and environmental factors affecting growth, physiology and reproductive patterns in two forms of Atlantic salmon Salmo salar (Linnaeus) 1758, in Newfoundland |
title_fullStr |
Genetic and environmental factors affecting growth, physiology and reproductive patterns in two forms of Atlantic salmon Salmo salar (Linnaeus) 1758, in Newfoundland |
title_full_unstemmed |
Genetic and environmental factors affecting growth, physiology and reproductive patterns in two forms of Atlantic salmon Salmo salar (Linnaeus) 1758, in Newfoundland |
title_sort |
genetic and environmental factors affecting growth, physiology and reproductive patterns in two forms of atlantic salmon salmo salar (linnaeus) 1758, in newfoundland |
publishDate |
1984 |
url |
http://collections.mun.ca/cdm/ref/collection/theses2/id/46356 |
genre |
Atlantic salmon Newfoundland studies Salmo salar University of Newfoundland |
genre_facet |
Atlantic salmon Newfoundland studies Salmo salar University of Newfoundland |
op_source |
Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries |
op_relation |
Electronic Theses and Dissertations (15.76 MB) -- http://collections.mun.ca/PDFs/theses/Maclean_DonaldA.pdf 75332327 http://collections.mun.ca/cdm/ref/collection/theses2/id/46356 |
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_ |
1766360406709764096 |