Comparative biology of the grenadiers Macrourus caml and M. whitsoni in the Ross Sea region, Antarctica
The grenadiers Macrourus caml and M. whitsoni form a significant bycatch component of longline fisheries for Antarctic toothfish ( Dissostichus mawsoni ) in the Southern Ocean. A lack of species-level biological and catch data has to date hindered the development of quantitative assessments for thes...
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Online Access: | http://dx.doi.org/10.3389/fmars.2022.968848 https://www.frontiersin.org/articles/10.3389/fmars.2022.968848/full |
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crfrontiers:10.3389/fmars.2022.968848 2024-03-31T07:48:19+00:00 Comparative biology of the grenadiers Macrourus caml and M. whitsoni in the Ross Sea region, Antarctica Moore, Bradley R. Parker, Steven J. Marriott, Peter M. Sutton, Colin Pinkerton, Matthew H. Ministry of Business, Innovation and Employment Ministry for Primary Industries 2022 http://dx.doi.org/10.3389/fmars.2022.968848 https://www.frontiersin.org/articles/10.3389/fmars.2022.968848/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Marine Science volume 9 ISSN 2296-7745 Ocean Engineering Water Science and Technology Aquatic Science Global and Planetary Change Oceanography journal-article 2022 crfrontiers https://doi.org/10.3389/fmars.2022.968848 2024-03-05T00:11:04Z The grenadiers Macrourus caml and M. whitsoni form a significant bycatch component of longline fisheries for Antarctic toothfish ( Dissostichus mawsoni ) in the Southern Ocean. A lack of species-level biological and catch data has to date hindered the development of quantitative assessments for these deepwater species. This paper examines species- and sex-specific life histories of M . caml and M . whitsoni in the Ross Sea region, Antarctica, from samples collected from the commercial fishery and research collections. Macrourus caml was found to live longer, grow slower, and attain a larger maximum length than M . whitsoni , reaching at least 65 years of age and 97 cm total length (TL) vs. 43 years and 78 cm TL for M . whitsoni . In addition, M . caml attains a larger length for a given age and a greater weight for a given length. For each species, females of a given age were larger and reached a greater maximum age than males. Assuming that selectivity of the fishing gear is related to fish size, greater fishing pressure on females than males is likely, and was evidenced by female-biased sex ratios of both species. Estimates of natural and fishing mortality rates were low for both species. Despite having a shorter lifespan and attaining a smaller maximum length, M . whitsoni matured later in life and at larger lengths than M . caml . Although sampling opportunities are constrained seasonally due to sea ice cover, gonad staging and interannual patterns in gonadosomatic indices suggest prolonged spawning for both species, with available data indicating peak spawning during austral summer. The differences in life history observed between these two closely related and morphologically similar species illustrates the importance of understanding species-specific life histories to infer responses to exploitation, provide key biological inputs to inform parameters for future risk assessments and ecosystem models as well as baseline information for comparative work over both time and space, contribute to greater clarity ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Toothfish Antarctica Ross Sea Sea ice Southern Ocean Frontiers (Publisher) Antarctic Southern Ocean Austral Ross Sea Frontiers in Marine Science 9 |
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Open Polar |
collection |
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unknown |
topic |
Ocean Engineering Water Science and Technology Aquatic Science Global and Planetary Change Oceanography |
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Ocean Engineering Water Science and Technology Aquatic Science Global and Planetary Change Oceanography Moore, Bradley R. Parker, Steven J. Marriott, Peter M. Sutton, Colin Pinkerton, Matthew H. Comparative biology of the grenadiers Macrourus caml and M. whitsoni in the Ross Sea region, Antarctica |
topic_facet |
Ocean Engineering Water Science and Technology Aquatic Science Global and Planetary Change Oceanography |
description |
The grenadiers Macrourus caml and M. whitsoni form a significant bycatch component of longline fisheries for Antarctic toothfish ( Dissostichus mawsoni ) in the Southern Ocean. A lack of species-level biological and catch data has to date hindered the development of quantitative assessments for these deepwater species. This paper examines species- and sex-specific life histories of M . caml and M . whitsoni in the Ross Sea region, Antarctica, from samples collected from the commercial fishery and research collections. Macrourus caml was found to live longer, grow slower, and attain a larger maximum length than M . whitsoni , reaching at least 65 years of age and 97 cm total length (TL) vs. 43 years and 78 cm TL for M . whitsoni . In addition, M . caml attains a larger length for a given age and a greater weight for a given length. For each species, females of a given age were larger and reached a greater maximum age than males. Assuming that selectivity of the fishing gear is related to fish size, greater fishing pressure on females than males is likely, and was evidenced by female-biased sex ratios of both species. Estimates of natural and fishing mortality rates were low for both species. Despite having a shorter lifespan and attaining a smaller maximum length, M . whitsoni matured later in life and at larger lengths than M . caml . Although sampling opportunities are constrained seasonally due to sea ice cover, gonad staging and interannual patterns in gonadosomatic indices suggest prolonged spawning for both species, with available data indicating peak spawning during austral summer. The differences in life history observed between these two closely related and morphologically similar species illustrates the importance of understanding species-specific life histories to infer responses to exploitation, provide key biological inputs to inform parameters for future risk assessments and ecosystem models as well as baseline information for comparative work over both time and space, contribute to greater clarity ... |
author2 |
Ministry of Business, Innovation and Employment Ministry for Primary Industries |
format |
Article in Journal/Newspaper |
author |
Moore, Bradley R. Parker, Steven J. Marriott, Peter M. Sutton, Colin Pinkerton, Matthew H. |
author_facet |
Moore, Bradley R. Parker, Steven J. Marriott, Peter M. Sutton, Colin Pinkerton, Matthew H. |
author_sort |
Moore, Bradley R. |
title |
Comparative biology of the grenadiers Macrourus caml and M. whitsoni in the Ross Sea region, Antarctica |
title_short |
Comparative biology of the grenadiers Macrourus caml and M. whitsoni in the Ross Sea region, Antarctica |
title_full |
Comparative biology of the grenadiers Macrourus caml and M. whitsoni in the Ross Sea region, Antarctica |
title_fullStr |
Comparative biology of the grenadiers Macrourus caml and M. whitsoni in the Ross Sea region, Antarctica |
title_full_unstemmed |
Comparative biology of the grenadiers Macrourus caml and M. whitsoni in the Ross Sea region, Antarctica |
title_sort |
comparative biology of the grenadiers macrourus caml and m. whitsoni in the ross sea region, antarctica |
publisher |
Frontiers Media SA |
publishDate |
2022 |
url |
http://dx.doi.org/10.3389/fmars.2022.968848 https://www.frontiersin.org/articles/10.3389/fmars.2022.968848/full |
geographic |
Antarctic Southern Ocean Austral Ross Sea |
geographic_facet |
Antarctic Southern Ocean Austral Ross Sea |
genre |
Antarc* Antarctic Antarctic Toothfish Antarctica Ross Sea Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Toothfish Antarctica Ross Sea Sea ice Southern Ocean |
op_source |
Frontiers in Marine Science volume 9 ISSN 2296-7745 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/fmars.2022.968848 |
container_title |
Frontiers in Marine Science |
container_volume |
9 |
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1795030605456474112 |