Age determination in the icefish Pseudochaenichthys georgianus (Channichthyidae) based on multiple methods using otoliths
Aging Antarctic icefish is difficult because of their lack of scales and poorly calcified bones. Icefish ages must therefore be estimated from otoliths. We describe a method of reading daily micro-increments in connection with shape, size and mass analyses of the otoliths of the South Georgia icefis...
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ftdoajarticles:oai:doaj.org/article:498783a75f2d4fb989f9b307dd25ed9e 2023-05-15T13:48:18+02:00 Age determination in the icefish Pseudochaenichthys georgianus (Channichthyidae) based on multiple methods using otoliths R Traczyk VB Meyer-Rochow RM Hughes 2021-01-01T00:00:00Z https://doi.org/10.3354/ab00736 https://doaj.org/article/498783a75f2d4fb989f9b307dd25ed9e EN eng Inter-Research https://www.int-res.com/abstracts/ab/v30/p1-18/ https://doaj.org/toc/1864-7782 https://doaj.org/toc/1864-7790 1864-7782 1864-7790 doi:10.3354/ab00736 https://doaj.org/article/498783a75f2d4fb989f9b307dd25ed9e Aquatic Biology, Vol 30, Pp 1-18 (2021) Biology (General) QH301-705.5 Microbiology QR1-502 article 2021 ftdoajarticles https://doi.org/10.3354/ab00736 2022-12-31T05:59:52Z Aging Antarctic icefish is difficult because of their lack of scales and poorly calcified bones. Icefish ages must therefore be estimated from otoliths. We describe a method of reading daily micro-increments in connection with shape, size and mass analyses of the otoliths of the South Georgia icefish Pseudochaenichthys georgianus. Changes in otolith morphology and mass correlate with fish size and age group. The otolith micro-increment analysis is capable of establishing the age of an icefish by relating the daily micro-increment count to the life history of the fish. Micro-increment measurements and analyses are relatively simple to do by light and scanning electron microscopy and by using micro-densitometer and digitizing equipment. Drastic changes in the life history of an individual are reflected by measurable changes in its otolith micro-increment data as seen in our analyses of age groups 0-VI. The initial drastic change in daily micro-increment shapes and periodicities occur in connection with the hatching period of the icefish. The next drastic change in otolith shape and daily micro-increments occurs when ~7 cm long fish shift from pelagic to benthic habitats. As the fish age beyond group III, individual otolith variability lessens until they begin spawning. Our results indicate a single population of P. georgianus between the Antarctic Peninsula and South Georgia. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Icefish Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic Antarctic Peninsula Aquatic Biology 30 1 18 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Biology (General) QH301-705.5 Microbiology QR1-502 |
spellingShingle |
Biology (General) QH301-705.5 Microbiology QR1-502 R Traczyk VB Meyer-Rochow RM Hughes Age determination in the icefish Pseudochaenichthys georgianus (Channichthyidae) based on multiple methods using otoliths |
topic_facet |
Biology (General) QH301-705.5 Microbiology QR1-502 |
description |
Aging Antarctic icefish is difficult because of their lack of scales and poorly calcified bones. Icefish ages must therefore be estimated from otoliths. We describe a method of reading daily micro-increments in connection with shape, size and mass analyses of the otoliths of the South Georgia icefish Pseudochaenichthys georgianus. Changes in otolith morphology and mass correlate with fish size and age group. The otolith micro-increment analysis is capable of establishing the age of an icefish by relating the daily micro-increment count to the life history of the fish. Micro-increment measurements and analyses are relatively simple to do by light and scanning electron microscopy and by using micro-densitometer and digitizing equipment. Drastic changes in the life history of an individual are reflected by measurable changes in its otolith micro-increment data as seen in our analyses of age groups 0-VI. The initial drastic change in daily micro-increment shapes and periodicities occur in connection with the hatching period of the icefish. The next drastic change in otolith shape and daily micro-increments occurs when ~7 cm long fish shift from pelagic to benthic habitats. As the fish age beyond group III, individual otolith variability lessens until they begin spawning. Our results indicate a single population of P. georgianus between the Antarctic Peninsula and South Georgia. |
format |
Article in Journal/Newspaper |
author |
R Traczyk VB Meyer-Rochow RM Hughes |
author_facet |
R Traczyk VB Meyer-Rochow RM Hughes |
author_sort |
R Traczyk |
title |
Age determination in the icefish Pseudochaenichthys georgianus (Channichthyidae) based on multiple methods using otoliths |
title_short |
Age determination in the icefish Pseudochaenichthys georgianus (Channichthyidae) based on multiple methods using otoliths |
title_full |
Age determination in the icefish Pseudochaenichthys georgianus (Channichthyidae) based on multiple methods using otoliths |
title_fullStr |
Age determination in the icefish Pseudochaenichthys georgianus (Channichthyidae) based on multiple methods using otoliths |
title_full_unstemmed |
Age determination in the icefish Pseudochaenichthys georgianus (Channichthyidae) based on multiple methods using otoliths |
title_sort |
age determination in the icefish pseudochaenichthys georgianus (channichthyidae) based on multiple methods using otoliths |
publisher |
Inter-Research |
publishDate |
2021 |
url |
https://doi.org/10.3354/ab00736 https://doaj.org/article/498783a75f2d4fb989f9b307dd25ed9e |
geographic |
Antarctic The Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic Peninsula Icefish |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Icefish |
op_source |
Aquatic Biology, Vol 30, Pp 1-18 (2021) |
op_relation |
https://www.int-res.com/abstracts/ab/v30/p1-18/ https://doaj.org/toc/1864-7782 https://doaj.org/toc/1864-7790 1864-7782 1864-7790 doi:10.3354/ab00736 https://doaj.org/article/498783a75f2d4fb989f9b307dd25ed9e |
op_doi |
https://doi.org/10.3354/ab00736 |
container_title |
Aquatic Biology |
container_volume |
30 |
container_start_page |
1 |
op_container_end_page |
18 |
_version_ |
1766249085869752320 |