Fishing down Canadian aquatic food webs
The mean trophic level (TL) of fish landed in fisheries on the east and west coasts of Canada is declining by 0.030.10·decade 1 , similar to global trends. This finding is based on data from United Nations Food and Agriculture Organization and the Canadian Department of Fisheries and Oceans and ot...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
2001
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/f00-193 http://www.nrcresearchpress.com/doi/pdf/10.1139/f00-193 |
id |
crcansciencepubl:10.1139/f00-193 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/f00-193 2024-04-28T08:13:02+00:00 Fishing down Canadian aquatic food webs Pauly, Daniel Palomares, Ma. Lourdes Froese, Rainer Sa-a, Pascualita Vakily, Michael Preikshot, David Wallace, Scott 2001 http://dx.doi.org/10.1139/f00-193 http://www.nrcresearchpress.com/doi/pdf/10.1139/f00-193 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 58, issue 1, page 51-62 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2001 crcansciencepubl https://doi.org/10.1139/f00-193 2024-04-09T06:56:25Z The mean trophic level (TL) of fish landed in fisheries on the east and west coasts of Canada is declining by 0.030.10·decade 1 , similar to global trends. This finding is based on data from United Nations Food and Agriculture Organization and the Canadian Department of Fisheries and Oceans and other Canadian sources for the period 18731997. Significant rates of decline in mean TL were obtained even when key species Atlantic cod (Gadus morhua) on the east coast and Pacific herring (Clupea pallasi) and Pacific hake (Merluccius productus) on the west coast were omitted from the analysis. Fish taken in inland water fisheries did not exhibit a decline in mean TL. Two models were developed, based on length and age, respectively, for correcting TL estimates of individual species for the effects of changes in body size due to changes in fishing mortality. Both produced corrections that were small relative to changes in mean TL that resulted from changes in species composition of the catch over time. Overall, these results suggest that the mean TL of fish landed can be used as an index of sustainability in multispecies fisheries and that its reliability will depend on the quality of the data and length of the time series available for analysis. Article in Journal/Newspaper atlantic cod Gadus morhua Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 58 1 51 62 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Pauly, Daniel Palomares, Ma. Lourdes Froese, Rainer Sa-a, Pascualita Vakily, Michael Preikshot, David Wallace, Scott Fishing down Canadian aquatic food webs |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
The mean trophic level (TL) of fish landed in fisheries on the east and west coasts of Canada is declining by 0.030.10·decade 1 , similar to global trends. This finding is based on data from United Nations Food and Agriculture Organization and the Canadian Department of Fisheries and Oceans and other Canadian sources for the period 18731997. Significant rates of decline in mean TL were obtained even when key species Atlantic cod (Gadus morhua) on the east coast and Pacific herring (Clupea pallasi) and Pacific hake (Merluccius productus) on the west coast were omitted from the analysis. Fish taken in inland water fisheries did not exhibit a decline in mean TL. Two models were developed, based on length and age, respectively, for correcting TL estimates of individual species for the effects of changes in body size due to changes in fishing mortality. Both produced corrections that were small relative to changes in mean TL that resulted from changes in species composition of the catch over time. Overall, these results suggest that the mean TL of fish landed can be used as an index of sustainability in multispecies fisheries and that its reliability will depend on the quality of the data and length of the time series available for analysis. |
format |
Article in Journal/Newspaper |
author |
Pauly, Daniel Palomares, Ma. Lourdes Froese, Rainer Sa-a, Pascualita Vakily, Michael Preikshot, David Wallace, Scott |
author_facet |
Pauly, Daniel Palomares, Ma. Lourdes Froese, Rainer Sa-a, Pascualita Vakily, Michael Preikshot, David Wallace, Scott |
author_sort |
Pauly, Daniel |
title |
Fishing down Canadian aquatic food webs |
title_short |
Fishing down Canadian aquatic food webs |
title_full |
Fishing down Canadian aquatic food webs |
title_fullStr |
Fishing down Canadian aquatic food webs |
title_full_unstemmed |
Fishing down Canadian aquatic food webs |
title_sort |
fishing down canadian aquatic food webs |
publisher |
Canadian Science Publishing |
publishDate |
2001 |
url |
http://dx.doi.org/10.1139/f00-193 http://www.nrcresearchpress.com/doi/pdf/10.1139/f00-193 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 58, issue 1, page 51-62 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f00-193 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
58 |
container_issue |
1 |
container_start_page |
51 |
op_container_end_page |
62 |
_version_ |
1797579698544312320 |