The complex relationship between weight and length of Atlantic cod off the south coast of Newfoundland
The relationship between the length and weight of fish is used to assess their growth and condition. This relationship is often assumed to be the same spatially and temporally. However, variability in the weight–length relationship can occur, which provides important information about stock producti...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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crcansciencepubl:10.1139/cjfas-2021-0325 2024-09-15T17:55:25+00:00 The complex relationship between weight and length of Atlantic cod off the south coast of Newfoundland Cadigan, Noel Robertson, Matthew D. Nirmalkanna, Kunasekaran Zheng, Nan 2022 http://dx.doi.org/10.1139/cjfas-2021-0325 https://cdnsciencepub.com/doi/full-xml/10.1139/cjfas-2021-0325 https://cdnsciencepub.com/doi/pdf/10.1139/cjfas-2021-0325 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 79, issue 11, page 1798-1819 ISSN 0706-652X 1205-7533 journal-article 2022 crcansciencepubl https://doi.org/10.1139/cjfas-2021-0325 2024-08-01T04:10:04Z The relationship between the length and weight of fish is used to assess their growth and condition. This relationship is often assumed to be the same spatially and temporally. However, variability in the weight–length relationship can occur, which provides important information about stock productivity. We developed a spatiotemporal model for the weight–length relationship that is useful for predictions in un-sampled areas. We applied the model to survey data for Atlantic cod off the southern coast of Newfoundland, Canada. We found that weight-at-length was higher inshore, oscillated over time, was below average in recent years, declined during late-January to early-June especially for intermediate sized cod, and that the temporal oscillations were correlated with several local environmental time series. Finally, the model estimated a decrease in the allometric coefficient for intermediate sized cod (40–80 cm), indicating that those cod may be experiencing additional feeding deficiencies. Spatiotemporal variation in the weight-at-length relationship should be accounted for in the stock assessment process when fishery catch numbers are derived from tonnes landed and when estimating stock and fishery weights-at-age. Article in Journal/Newspaper atlantic cod Newfoundland Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
The relationship between the length and weight of fish is used to assess their growth and condition. This relationship is often assumed to be the same spatially and temporally. However, variability in the weight–length relationship can occur, which provides important information about stock productivity. We developed a spatiotemporal model for the weight–length relationship that is useful for predictions in un-sampled areas. We applied the model to survey data for Atlantic cod off the southern coast of Newfoundland, Canada. We found that weight-at-length was higher inshore, oscillated over time, was below average in recent years, declined during late-January to early-June especially for intermediate sized cod, and that the temporal oscillations were correlated with several local environmental time series. Finally, the model estimated a decrease in the allometric coefficient for intermediate sized cod (40–80 cm), indicating that those cod may be experiencing additional feeding deficiencies. Spatiotemporal variation in the weight-at-length relationship should be accounted for in the stock assessment process when fishery catch numbers are derived from tonnes landed and when estimating stock and fishery weights-at-age. |
format |
Article in Journal/Newspaper |
author |
Cadigan, Noel Robertson, Matthew D. Nirmalkanna, Kunasekaran Zheng, Nan |
spellingShingle |
Cadigan, Noel Robertson, Matthew D. Nirmalkanna, Kunasekaran Zheng, Nan The complex relationship between weight and length of Atlantic cod off the south coast of Newfoundland |
author_facet |
Cadigan, Noel Robertson, Matthew D. Nirmalkanna, Kunasekaran Zheng, Nan |
author_sort |
Cadigan, Noel |
title |
The complex relationship between weight and length of Atlantic cod off the south coast of Newfoundland |
title_short |
The complex relationship between weight and length of Atlantic cod off the south coast of Newfoundland |
title_full |
The complex relationship between weight and length of Atlantic cod off the south coast of Newfoundland |
title_fullStr |
The complex relationship between weight and length of Atlantic cod off the south coast of Newfoundland |
title_full_unstemmed |
The complex relationship between weight and length of Atlantic cod off the south coast of Newfoundland |
title_sort |
complex relationship between weight and length of atlantic cod off the south coast of newfoundland |
publisher |
Canadian Science Publishing |
publishDate |
2022 |
url |
http://dx.doi.org/10.1139/cjfas-2021-0325 https://cdnsciencepub.com/doi/full-xml/10.1139/cjfas-2021-0325 https://cdnsciencepub.com/doi/pdf/10.1139/cjfas-2021-0325 |
genre |
atlantic cod Newfoundland |
genre_facet |
atlantic cod Newfoundland |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 79, issue 11, page 1798-1819 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjfas-2021-0325 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
_version_ |
1810431712348340224 |