Spatio-temporal dynamics in maturation and spawning of Patagonian toothfish Dissostichus eleginoides on the sub-Antarctic Kerguelen Plateau
This study investigated maturation and spawning of Patagonian toothfish Dissostichus eleginoides in the Heard Island and McDonald Islands (HIMI) fishery on the Kerguelen Plateau in the Indian Sector of the Southern Ocean based on gonads and otoliths collected between 2004 and 2015 and using histolog...
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Blackwell Publishing Ltd
2018
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ftunivtasmania:oai:eprints.utas.edu.au:45329 2023-05-15T13:41:50+02:00 Spatio-temporal dynamics in maturation and spawning of Patagonian toothfish Dissostichus eleginoides on the sub-Antarctic Kerguelen Plateau Yates, P Ziegler, P Welsford, D McIvor, J Farmer, B Woodcock, E 2018 https://eprints.utas.edu.au/45329/ unknown Blackwell Publishing Ltd Yates, P, Ziegler, P, Welsford, D, McIvor, J, Farmer, B and Woodcock, E 2018 , 'Spatio-temporal dynamics in maturation and spawning of Patagonian toothfish Dissostichus eleginoides on the sub-Antarctic Kerguelen Plateau' , Journal of Fish Biology, vol. 92, no. 1 , pp. 34-54 , doi:10.1111/jfb.13479 <http://dx.doi.org/10.1111/jfb.13479>. Nototheniidae oocyte reproduction Southern Ocean spermatozoa stock assessment Article PeerReviewed 2018 ftunivtasmania https://doi.org/10.1111/jfb.13479 2022-03-21T23:16:32Z This study investigated maturation and spawning of Patagonian toothfish Dissostichus eleginoides in the Heard Island and McDonald Islands (HIMI) fishery on the Kerguelen Plateau in the Indian Sector of the Southern Ocean based on gonads and otoliths collected between 2004 and 2015 and using histological analyses and calibration of macroscopic staging criteria. Dissostichus eleginoides at HIMI spawn throughout the austral late autumn and winter months of May-August and spawning activity is concentrated on slopes along the west and south of the plateau around HIMI at depths of 1500-1900 m. Comparison between histological analyses and macroscopic gonad staging indicated that many fish that had spawned, as indicated by the presence of post-ovulatory follicles, returned to a resting stage which was macroscopically indistinguishable from maturing fish. Furthermore, the occurrence of females of all size classes with low gonado-somatic index and low macroscopic gonad stage during the spawning season suggested that a proportion of mature females did not spawn every year. Age-at-maturity estimates, based on the assumption that fish of macroscopic stages >=2 were mature, decreased between the 2004-2009 and 2010-2015 periods for both sexes. The magnitude of this temporal variation in age at maturity, however, varied between gear types and fishing depths and variable sampling regimes probably influenced these variations. This study highlights the importance of correct interpretation of macroscopic gonad stages and understanding the influence of fishery operations on estimations of life-history parameters. Article in Journal/Newspaper Antarc* Antarctic Heard Island McDonald Islands Patagonian Toothfish Southern Ocean University of Tasmania: UTas ePrints Antarctic Southern Ocean Austral Kerguelen Heard Island Indian Heard Island ENVELOPE(73.510,73.510,-53.117,-53.117) Heard ENVELOPE(73.510,73.510,-53.117,-53.117) McDonald Islands ENVELOPE(72.600,72.600,-53.033,-53.033) Journal of Fish Biology 92 1 34 54 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
unknown |
topic |
Nototheniidae oocyte reproduction Southern Ocean spermatozoa stock assessment |
spellingShingle |
Nototheniidae oocyte reproduction Southern Ocean spermatozoa stock assessment Yates, P Ziegler, P Welsford, D McIvor, J Farmer, B Woodcock, E Spatio-temporal dynamics in maturation and spawning of Patagonian toothfish Dissostichus eleginoides on the sub-Antarctic Kerguelen Plateau |
topic_facet |
Nototheniidae oocyte reproduction Southern Ocean spermatozoa stock assessment |
description |
This study investigated maturation and spawning of Patagonian toothfish Dissostichus eleginoides in the Heard Island and McDonald Islands (HIMI) fishery on the Kerguelen Plateau in the Indian Sector of the Southern Ocean based on gonads and otoliths collected between 2004 and 2015 and using histological analyses and calibration of macroscopic staging criteria. Dissostichus eleginoides at HIMI spawn throughout the austral late autumn and winter months of May-August and spawning activity is concentrated on slopes along the west and south of the plateau around HIMI at depths of 1500-1900 m. Comparison between histological analyses and macroscopic gonad staging indicated that many fish that had spawned, as indicated by the presence of post-ovulatory follicles, returned to a resting stage which was macroscopically indistinguishable from maturing fish. Furthermore, the occurrence of females of all size classes with low gonado-somatic index and low macroscopic gonad stage during the spawning season suggested that a proportion of mature females did not spawn every year. Age-at-maturity estimates, based on the assumption that fish of macroscopic stages >=2 were mature, decreased between the 2004-2009 and 2010-2015 periods for both sexes. The magnitude of this temporal variation in age at maturity, however, varied between gear types and fishing depths and variable sampling regimes probably influenced these variations. This study highlights the importance of correct interpretation of macroscopic gonad stages and understanding the influence of fishery operations on estimations of life-history parameters. |
format |
Article in Journal/Newspaper |
author |
Yates, P Ziegler, P Welsford, D McIvor, J Farmer, B Woodcock, E |
author_facet |
Yates, P Ziegler, P Welsford, D McIvor, J Farmer, B Woodcock, E |
author_sort |
Yates, P |
title |
Spatio-temporal dynamics in maturation and spawning of Patagonian toothfish Dissostichus eleginoides on the sub-Antarctic Kerguelen Plateau |
title_short |
Spatio-temporal dynamics in maturation and spawning of Patagonian toothfish Dissostichus eleginoides on the sub-Antarctic Kerguelen Plateau |
title_full |
Spatio-temporal dynamics in maturation and spawning of Patagonian toothfish Dissostichus eleginoides on the sub-Antarctic Kerguelen Plateau |
title_fullStr |
Spatio-temporal dynamics in maturation and spawning of Patagonian toothfish Dissostichus eleginoides on the sub-Antarctic Kerguelen Plateau |
title_full_unstemmed |
Spatio-temporal dynamics in maturation and spawning of Patagonian toothfish Dissostichus eleginoides on the sub-Antarctic Kerguelen Plateau |
title_sort |
spatio-temporal dynamics in maturation and spawning of patagonian toothfish dissostichus eleginoides on the sub-antarctic kerguelen plateau |
publisher |
Blackwell Publishing Ltd |
publishDate |
2018 |
url |
https://eprints.utas.edu.au/45329/ |
long_lat |
ENVELOPE(73.510,73.510,-53.117,-53.117) ENVELOPE(73.510,73.510,-53.117,-53.117) ENVELOPE(72.600,72.600,-53.033,-53.033) |
geographic |
Antarctic Southern Ocean Austral Kerguelen Heard Island Indian Heard Island Heard McDonald Islands |
geographic_facet |
Antarctic Southern Ocean Austral Kerguelen Heard Island Indian Heard Island Heard McDonald Islands |
genre |
Antarc* Antarctic Heard Island McDonald Islands Patagonian Toothfish Southern Ocean |
genre_facet |
Antarc* Antarctic Heard Island McDonald Islands Patagonian Toothfish Southern Ocean |
op_relation |
Yates, P, Ziegler, P, Welsford, D, McIvor, J, Farmer, B and Woodcock, E 2018 , 'Spatio-temporal dynamics in maturation and spawning of Patagonian toothfish Dissostichus eleginoides on the sub-Antarctic Kerguelen Plateau' , Journal of Fish Biology, vol. 92, no. 1 , pp. 34-54 , doi:10.1111/jfb.13479 <http://dx.doi.org/10.1111/jfb.13479>. |
op_doi |
https://doi.org/10.1111/jfb.13479 |
container_title |
Journal of Fish Biology |
container_volume |
92 |
container_issue |
1 |
container_start_page |
34 |
op_container_end_page |
54 |
_version_ |
1766158997966028800 |