State of sexual maturity of Atlantic salmon (Salmo salar L.) caught at sea, in commercial fisheries off Newfoundland
The state of maturity of male and female Atlantic salmon harvested at sea during 1990 and 1991 at three sites in Newfoundland was investigated. Salmon landed at St. Barbe Bay, Conche and Twillingate were sampled throughout the commercial fishing season (June - August). The methods used to determine...
Main Author: | |
---|---|
Format: | Thesis |
Language: | English |
Published: |
Memorial University of Newfoundland
1995
|
Subjects: | |
Online Access: | https://research.library.mun.ca/4176/ https://research.library.mun.ca/4176/1/Mullins_ConradCalvert.pdf https://research.library.mun.ca/4176/3/Mullins_ConradCalvert.pdf |
id |
ftmemorialuniv:oai:research.library.mun.ca:4176 |
---|---|
record_format |
openpolar |
spelling |
ftmemorialuniv:oai:research.library.mun.ca:4176 2023-10-01T03:54:44+02:00 State of sexual maturity of Atlantic salmon (Salmo salar L.) caught at sea, in commercial fisheries off Newfoundland Mullins, Conrad 1995 application/pdf https://research.library.mun.ca/4176/ https://research.library.mun.ca/4176/1/Mullins_ConradCalvert.pdf https://research.library.mun.ca/4176/3/Mullins_ConradCalvert.pdf en eng Memorial University of Newfoundland https://research.library.mun.ca/4176/1/Mullins_ConradCalvert.pdf https://research.library.mun.ca/4176/3/Mullins_ConradCalvert.pdf Mullins, Conrad <https://research.library.mun.ca/view/creator_az/Mullins=3AConrad=3A=3A.html> (1995) State of sexual maturity of Atlantic salmon (Salmo salar L.) caught at sea, in commercial fisheries off Newfoundland. Masters thesis, Memorial University of Newfoundland. thesis_license Thesis NonPeerReviewed 1995 ftmemorialuniv 2023-09-03T06:44:54Z The state of maturity of male and female Atlantic salmon harvested at sea during 1990 and 1991 at three sites in Newfoundland was investigated. Salmon landed at St. Barbe Bay, Conche and Twillingate were sampled throughout the commercial fishing season (June - August). The methods used to determine the state of maturity in male and female salmon were histological examination of gonadal development and radioimmunoassay of plasma steroid hormone levels. The gonad stage development, gonadosomatic index (GSI), hepatosomatic index (HSI), condition factor (CF), testosterone (T), 11-ketotestosterone (11-KT), vitellogenin (Vg) and 17β-estradiol (E2) levels measured in commercially caught salmon were compared with those of cage-reared and wild salmon of known background to verify the maturity classifications. Stages of gonad development, the levels of T, E2, 11-KT, Vg, and GSI, HSI and CF measured in male and female salmon of known state of maturity were used to develop discriminant functions for predicting the state of maturity in commercially caught salmon. Salmon sampled in St. Barbe Bay in the Gulf of St. Lawrence were 100% spawners-of-the-year, whereas, samples from Conche and Twillingate on the northeast coast of Newfoundland consisted of salmon that would not have returned to their native rivers to spawn. Differences in biological characteristics of salmon from the commercial fishery locations tend to support the maritime origin of the non-maturing component of commercial landings in Newfoundland. Male and female Atlantic salmon that are not spawners-of-the-year can be recognized by discriminant analysis techniques on the basis of the stage of gonad development, plasma hormone levels, and GSI. Thesis Atlantic salmon Newfoundland Salmo salar Memorial University of Newfoundland: Research Repository Twillingate ENVELOPE(-54.765,-54.765,49.650,49.650) Conche ENVELOPE(-55.898,-55.898,50.883,50.883) St Barbe ENVELOPE(-56.765,-56.765,51.200,51.200) St. Barbe Bay ENVELOPE(-56.781,-56.781,51.217,51.217) |
institution |
Open Polar |
collection |
Memorial University of Newfoundland: Research Repository |
op_collection_id |
ftmemorialuniv |
language |
English |
description |
The state of maturity of male and female Atlantic salmon harvested at sea during 1990 and 1991 at three sites in Newfoundland was investigated. Salmon landed at St. Barbe Bay, Conche and Twillingate were sampled throughout the commercial fishing season (June - August). The methods used to determine the state of maturity in male and female salmon were histological examination of gonadal development and radioimmunoassay of plasma steroid hormone levels. The gonad stage development, gonadosomatic index (GSI), hepatosomatic index (HSI), condition factor (CF), testosterone (T), 11-ketotestosterone (11-KT), vitellogenin (Vg) and 17β-estradiol (E2) levels measured in commercially caught salmon were compared with those of cage-reared and wild salmon of known background to verify the maturity classifications. Stages of gonad development, the levels of T, E2, 11-KT, Vg, and GSI, HSI and CF measured in male and female salmon of known state of maturity were used to develop discriminant functions for predicting the state of maturity in commercially caught salmon. Salmon sampled in St. Barbe Bay in the Gulf of St. Lawrence were 100% spawners-of-the-year, whereas, samples from Conche and Twillingate on the northeast coast of Newfoundland consisted of salmon that would not have returned to their native rivers to spawn. Differences in biological characteristics of salmon from the commercial fishery locations tend to support the maritime origin of the non-maturing component of commercial landings in Newfoundland. Male and female Atlantic salmon that are not spawners-of-the-year can be recognized by discriminant analysis techniques on the basis of the stage of gonad development, plasma hormone levels, and GSI. |
format |
Thesis |
author |
Mullins, Conrad |
spellingShingle |
Mullins, Conrad State of sexual maturity of Atlantic salmon (Salmo salar L.) caught at sea, in commercial fisheries off Newfoundland |
author_facet |
Mullins, Conrad |
author_sort |
Mullins, Conrad |
title |
State of sexual maturity of Atlantic salmon (Salmo salar L.) caught at sea, in commercial fisheries off Newfoundland |
title_short |
State of sexual maturity of Atlantic salmon (Salmo salar L.) caught at sea, in commercial fisheries off Newfoundland |
title_full |
State of sexual maturity of Atlantic salmon (Salmo salar L.) caught at sea, in commercial fisheries off Newfoundland |
title_fullStr |
State of sexual maturity of Atlantic salmon (Salmo salar L.) caught at sea, in commercial fisheries off Newfoundland |
title_full_unstemmed |
State of sexual maturity of Atlantic salmon (Salmo salar L.) caught at sea, in commercial fisheries off Newfoundland |
title_sort |
state of sexual maturity of atlantic salmon (salmo salar l.) caught at sea, in commercial fisheries off newfoundland |
publisher |
Memorial University of Newfoundland |
publishDate |
1995 |
url |
https://research.library.mun.ca/4176/ https://research.library.mun.ca/4176/1/Mullins_ConradCalvert.pdf https://research.library.mun.ca/4176/3/Mullins_ConradCalvert.pdf |
long_lat |
ENVELOPE(-54.765,-54.765,49.650,49.650) ENVELOPE(-55.898,-55.898,50.883,50.883) ENVELOPE(-56.765,-56.765,51.200,51.200) ENVELOPE(-56.781,-56.781,51.217,51.217) |
geographic |
Twillingate Conche St Barbe St. Barbe Bay |
geographic_facet |
Twillingate Conche St Barbe St. Barbe Bay |
genre |
Atlantic salmon Newfoundland Salmo salar |
genre_facet |
Atlantic salmon Newfoundland Salmo salar |
op_relation |
https://research.library.mun.ca/4176/1/Mullins_ConradCalvert.pdf https://research.library.mun.ca/4176/3/Mullins_ConradCalvert.pdf Mullins, Conrad <https://research.library.mun.ca/view/creator_az/Mullins=3AConrad=3A=3A.html> (1995) State of sexual maturity of Atlantic salmon (Salmo salar L.) caught at sea, in commercial fisheries off Newfoundland. Masters thesis, Memorial University of Newfoundland. |
op_rights |
thesis_license |
_version_ |
1778522617329745920 |