Contrasting life history characteristics of the eightbar grouper Hyporthodus octofasciatus (Pisces: Epinephelidae) over a large latitudinal range reveals spawning omission at higher latitudes
Demographic data on deep-water groupers are limited despite them being highly exploited throughout the Indo-Pacific. In Western Australia, the continuous distribution of the eightbar grouper, Hyporthodus octofasciatus, spans tropical to temperate waters over 3500 km from 128S–358S. The maximum age w...
| Main Authors: | , , , , |
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| Format: | Journal Article |
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Oxford University Press 2009
2013
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| Online Access: | http://icesjms.oxfordjournals.org/content/70/3/485 http://hdl.handle.net/20.500.11937/31916 |
| _version_ | 1848753517312868352 |
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| author | Wakefield, Corey Newman, Stephen Marriott, R. Boddington, D. Fairclough, D. |
| author_facet | Wakefield, Corey Newman, Stephen Marriott, R. Boddington, D. Fairclough, D. |
| author_sort | Wakefield, Corey |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Demographic data on deep-water groupers are limited despite them being highly exploited throughout the Indo-Pacific. In Western Australia, the continuous distribution of the eightbar grouper, Hyporthodus octofasciatus, spans tropical to temperate waters over 3500 km from 128S–358S. The maximum age was markedly higher in the northern tropical waters than in southern temperate waters, i.e. 47 vs 20 years. Females attained a significantly larger length-at-age in southern temperate waters. Macroscopic and microscopic, examination of gonads and annual trends in mean monthly gonadosomatic indices (GSIs) were used to determine that this monandric protogynous hermaphrodite spawns from late spring to summer (October–February) in northwestern Australia. In the temperate waters of WA, there was no evidence of reproduction and no males were observed south of 308S latitude. The lengths at which 50% of female H. octofasciatus matured and changed sex were estimated from northern tropical populations at 560 mm (6.1 years) and 1022 mm (=11 years). Although the population connectivity of H. octofasciatus is unknown, the spawning omission in temperate waters suggests recruitment from the northern tropical areas and highlights the importance of preserving spawning stocks in those northern waters. |
| first_indexed | 2025-11-14T08:25:46Z |
| format | Journal Article |
| id | curtin-20.500.11937-31916 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:25:46Z |
| publishDate | 2013 |
| publisher | Oxford University Press 2009 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-319162017-02-28T01:43:24Z Contrasting life history characteristics of the eightbar grouper Hyporthodus octofasciatus (Pisces: Epinephelidae) over a large latitudinal range reveals spawning omission at higher latitudes Wakefield, Corey Newman, Stephen Marriott, R. Boddington, D. Fairclough, D. demography protogynous hermaphroditism deep-water maturity global climate change Western Australia age reproduction growth Demographic data on deep-water groupers are limited despite them being highly exploited throughout the Indo-Pacific. In Western Australia, the continuous distribution of the eightbar grouper, Hyporthodus octofasciatus, spans tropical to temperate waters over 3500 km from 128S–358S. The maximum age was markedly higher in the northern tropical waters than in southern temperate waters, i.e. 47 vs 20 years. Females attained a significantly larger length-at-age in southern temperate waters. Macroscopic and microscopic, examination of gonads and annual trends in mean monthly gonadosomatic indices (GSIs) were used to determine that this monandric protogynous hermaphrodite spawns from late spring to summer (October–February) in northwestern Australia. In the temperate waters of WA, there was no evidence of reproduction and no males were observed south of 308S latitude. The lengths at which 50% of female H. octofasciatus matured and changed sex were estimated from northern tropical populations at 560 mm (6.1 years) and 1022 mm (=11 years). Although the population connectivity of H. octofasciatus is unknown, the spawning omission in temperate waters suggests recruitment from the northern tropical areas and highlights the importance of preserving spawning stocks in those northern waters. 2013 Journal Article http://hdl.handle.net/20.500.11937/31916 http://icesjms.oxfordjournals.org/content/70/3/485 Oxford University Press 2009 restricted |
| spellingShingle | demography protogynous hermaphroditism deep-water maturity global climate change Western Australia age reproduction growth Wakefield, Corey Newman, Stephen Marriott, R. Boddington, D. Fairclough, D. Contrasting life history characteristics of the eightbar grouper Hyporthodus octofasciatus (Pisces: Epinephelidae) over a large latitudinal range reveals spawning omission at higher latitudes |
| title | Contrasting life history characteristics of the eightbar grouper Hyporthodus octofasciatus (Pisces: Epinephelidae) over a large latitudinal range reveals spawning omission at higher latitudes |
| title_full | Contrasting life history characteristics of the eightbar grouper Hyporthodus octofasciatus (Pisces: Epinephelidae) over a large latitudinal range reveals spawning omission at higher latitudes |
| title_fullStr | Contrasting life history characteristics of the eightbar grouper Hyporthodus octofasciatus (Pisces: Epinephelidae) over a large latitudinal range reveals spawning omission at higher latitudes |
| title_full_unstemmed | Contrasting life history characteristics of the eightbar grouper Hyporthodus octofasciatus (Pisces: Epinephelidae) over a large latitudinal range reveals spawning omission at higher latitudes |
| title_short | Contrasting life history characteristics of the eightbar grouper Hyporthodus octofasciatus (Pisces: Epinephelidae) over a large latitudinal range reveals spawning omission at higher latitudes |
| title_sort | contrasting life history characteristics of the eightbar grouper hyporthodus octofasciatus (pisces: epinephelidae) over a large latitudinal range reveals spawning omission at higher latitudes |
| topic | demography protogynous hermaphroditism deep-water maturity global climate change Western Australia age reproduction growth |
| url | http://icesjms.oxfordjournals.org/content/70/3/485 http://hdl.handle.net/20.500.11937/31916 |