Natural mortality from poor condition in Atlantic cod ( Gadus morhua)
The extent of energy depletion was assessed in Atlantic cod (Gadus morhua) in spring and early summer (1993-1995) to assess relationships between poor condition and natural mortality. Several indices of condition were compared in wild fish in the northern Gulf of St. Lawrence and in fish exposed to...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
2000
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/f00-023 http://www.nrcresearchpress.com/doi/pdf/10.1139/f00-023 |
id |
crcansciencepubl:10.1139/f00-023 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/f00-023 2024-09-09T19:29:43+00:00 Natural mortality from poor condition in Atlantic cod ( Gadus morhua) Dutil, Jean-Denis Lambert, Yvan 2000 http://dx.doi.org/10.1139/f00-023 http://www.nrcresearchpress.com/doi/pdf/10.1139/f00-023 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 57, issue 4, page 826-836 ISSN 0706-652X 1205-7533 journal-article 2000 crcansciencepubl https://doi.org/10.1139/f00-023 2024-08-01T04:10:01Z The extent of energy depletion was assessed in Atlantic cod (Gadus morhua) in spring and early summer (1993-1995) to assess relationships between poor condition and natural mortality. Several indices of condition were compared in wild fish in the northern Gulf of St. Lawrence and in fish exposed to a prolonged period of starvation in laboratory experiments. Discriminant analyses classified only a small fraction of the wild fish as similar to cod that did not survive and a much larger fraction as similar to cod that survived starvation. This percentage increased from April to May and peaked in June 1993 and 1994. Condition factor and muscle somatic index allowed a clear distinction between live and dead fish. Muscle lactate dehydrogenase activity suggested that cod had experienced a period of negative growth early in 1993, 1994, and 1995. Fish classified as similar to starved individuals were characterized by a higher gonad to liver mass ratio than others. Reproduction may have a negative impact on survival not only in spring but also later into summer, as some individuals were found not to have recovered by late summer. This study shows that natural mortality from poor condition contributed to lower production in the early 1990s. Article in Journal/Newspaper atlantic cod Gadus morhua Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 57 4 826 836 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
The extent of energy depletion was assessed in Atlantic cod (Gadus morhua) in spring and early summer (1993-1995) to assess relationships between poor condition and natural mortality. Several indices of condition were compared in wild fish in the northern Gulf of St. Lawrence and in fish exposed to a prolonged period of starvation in laboratory experiments. Discriminant analyses classified only a small fraction of the wild fish as similar to cod that did not survive and a much larger fraction as similar to cod that survived starvation. This percentage increased from April to May and peaked in June 1993 and 1994. Condition factor and muscle somatic index allowed a clear distinction between live and dead fish. Muscle lactate dehydrogenase activity suggested that cod had experienced a period of negative growth early in 1993, 1994, and 1995. Fish classified as similar to starved individuals were characterized by a higher gonad to liver mass ratio than others. Reproduction may have a negative impact on survival not only in spring but also later into summer, as some individuals were found not to have recovered by late summer. This study shows that natural mortality from poor condition contributed to lower production in the early 1990s. |
format |
Article in Journal/Newspaper |
author |
Dutil, Jean-Denis Lambert, Yvan |
spellingShingle |
Dutil, Jean-Denis Lambert, Yvan Natural mortality from poor condition in Atlantic cod ( Gadus morhua) |
author_facet |
Dutil, Jean-Denis Lambert, Yvan |
author_sort |
Dutil, Jean-Denis |
title |
Natural mortality from poor condition in Atlantic cod ( Gadus morhua) |
title_short |
Natural mortality from poor condition in Atlantic cod ( Gadus morhua) |
title_full |
Natural mortality from poor condition in Atlantic cod ( Gadus morhua) |
title_fullStr |
Natural mortality from poor condition in Atlantic cod ( Gadus morhua) |
title_full_unstemmed |
Natural mortality from poor condition in Atlantic cod ( Gadus morhua) |
title_sort |
natural mortality from poor condition in atlantic cod ( gadus morhua) |
publisher |
Canadian Science Publishing |
publishDate |
2000 |
url |
http://dx.doi.org/10.1139/f00-023 http://www.nrcresearchpress.com/doi/pdf/10.1139/f00-023 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 57, issue 4, page 826-836 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f00-023 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
57 |
container_issue |
4 |
container_start_page |
826 |
op_container_end_page |
836 |
_version_ |
1809898831481929728 |