Seasonal growth of macroalgae ( Sargassum ) shapes juvenile fish assemblages on subtropical reefs

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Τίτλος:	Seasonal growth of macroalgae ( Sargassum ) shapes juvenile fish assemblages on subtropical reefs
Συγγραφείς:	Chan, Sharon S. W., Lee, Gabriel Y., Leung, Priscilla T. Y., Wai, Tak-Cheung, Liu, Min, Yan, Meng, Leung, Kenneth M. Y., Lam, Paul K. S.
Πηγή:	Chan, S S W, Lee, G Y, Leung, P T Y, Wai, T-C, Liu, M, Yan, M, Leung, K M Y & Lam, P K S 2026, 'Seasonal growth of macroalgae ( Sargassum ) shapes juvenile fish assemblages on subtropical reefs', ICES Journal of Marine Science, vol. 83, no. 5, fsag083. https://doi.org/10.1093/icesjms/fsag083
Έτος έκδοσης:	2026
Θεματικοί όροι:	juvenile fish nursery, macroalgae seasonality, recruitment hotspots, Sargassumhabitat, subtropical reef ecosystem, This full text is made available under CC-BY 4.0. https://creativecommons.org/licenses/by/4.0
Περιγραφή:	Seasonal habitats formed by the brown algae Sargassum in Hong Kong provide important nursery grounds for juvenile fishes, including several commercially relevant species. This study used purse-seining and cage-trapping to explore the spatial-seasonal variation of juvenile fish assemblages in three coastal habitats, namely Sargassum beds, rocky reefs, and mangrove mudflats in three regions in Hong Kong, China. It also examined the influence of Sargassum canopy complexity on juvenile fish assemblage. Around 110,363 juvenile fish from 145 species were collected in total, including 58 unique to Sargassum . Over 92% of fishes were <3 cm long, mostly found during the peak Sargassum season. Differences in fish assemblages amongst the three types of coastal habitats and among the three regions were driven by seasons. Several commercially important species (e.g. Rhabdosargus sarba and Pagrus major ) were at least twice as abundant in Sargassum beds than rocky reefs during the peak season. Furthermore, a large group of juvenile fishes (61 species) had a substantial proportion (> 50%) of their relative abundance within Sargassum beds, in contrast to 13 and 26 species in rocky reefs and mangrove mudflats, respectively. Juvenile fish assemblages were structured by habitat-scale three-dimensional complexity, particularly the presence of canopy-forming Sargassum , whereas within-bed variation in canopy density or biomass had limited effects. The subtropical Sargassum beds host a greater diversity and biomass of juvenile fish when Sargassum flourishes. We conclude that seasonal Sargassum in subtropical coastal waters provides an important habitat refuge for juvenile fishes and contributes to fish recruitment. Such macroalgal habitats should be preserved and protected. © The Author(s) 2026. Published by Oxford University Press on behalf of International Council for the Exploration of the Sea.
Τύπος εγγράφου:	article in journal/newspaper
Περιγραφή αρχείου:	application/pdf
Γλώσσα:	English
ISSN:	1054-3139 1095-9289
Relation:	info:eu-repo/semantics/altIdentifier/wos/001769375000001; info:eu-repo/semantics/altIdentifier/hdl/https://hdl.handle.net/2031/69f655c3-da8a-4a86-a6ce-600fec63c62e; info:eu-repo/semantics/altIdentifier/pissn/1054-3139; info:eu-repo/semantics/altIdentifier/eissn/1095-9289
DOI:	10.1093/icesjms/fsag083
Διαθεσιμότητα:	https://scholars.cityu.edu.hk/en/publications/69f655c3-da8a-4a86-a6ce-600fec63c62e https://scholars.cityu.edu.hk/ws/files/494146419/491115073.pdf https://doi.org/10.1093/icesjms/fsag083 https://hdl.handle.net/2031/69f655c3-da8a-4a86-a6ce-600fec63c62e https://www.scopus.com/pages/publications/105038913263 https://www.scopus.com/pages/publications/105038913263#tab=impact
Rights:	info:eu-repo/semantics/openAccess ; http://creativecommons.org/licenses/by/4.0/
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Items	– Name: Title Label: Title Group: Ti Data: Seasonal growth of macroalgae ( Sargassum ) shapes juvenile fish assemblages on subtropical reefs – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Chan%2C+Sharon+S%2E+W%2E%22">Chan, Sharon S. W.</searchLink><br /><searchLink fieldCode="AR" term="%22Lee%2C+Gabriel+Y%2E%22">Lee, Gabriel Y.</searchLink><br /><searchLink fieldCode="AR" term="%22Leung%2C+Priscilla+T%2E+Y%2E%22">Leung, Priscilla T. Y.</searchLink><br /><searchLink fieldCode="AR" term="%22Wai%2C+Tak-Cheung%22">Wai, Tak-Cheung</searchLink><br /><searchLink fieldCode="AR" term="%22Liu%2C+Min%22">Liu, Min</searchLink><br /><searchLink fieldCode="AR" term="%22Yan%2C+Meng%22">Yan, Meng</searchLink><br /><searchLink fieldCode="AR" term="%22Leung%2C+Kenneth+M%2E+Y%2E%22">Leung, Kenneth M. Y.</searchLink><br /><searchLink fieldCode="AR" term="%22Lam%2C+Paul+K%2E+S%2E%22">Lam, Paul K. S.</searchLink> – Name: TitleSource Label: Source Group: Src Data: Chan, S S W, Lee, G Y, Leung, P T Y, Wai, T-C, Liu, M, Yan, M, Leung, K M Y & Lam, P K S 2026, 'Seasonal growth of macroalgae ( Sargassum ) shapes juvenile fish assemblages on subtropical reefs', ICES Journal of Marine Science, vol. 83, no. 5, fsag083. https://doi.org/10.1093/icesjms/fsag083 – Name: DatePubCY Label: Publication Year Group: Date Data: 2026 – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22juvenile+fish+nursery%22">juvenile fish nursery</searchLink><br /><searchLink fieldCode="DE" term="%22macroalgae+seasonality%22">macroalgae seasonality</searchLink><br /><searchLink fieldCode="DE" term="%22recruitment+hotspots%22">recruitment hotspots</searchLink><br /><searchLink fieldCode="DE" term="%22Sargassumhabitat%22">Sargassumhabitat</searchLink><br /><searchLink fieldCode="DE" term="%22subtropical+reef+ecosystem%22">subtropical reef ecosystem</searchLink><br /><searchLink fieldCode="DE" term="%22This+full+text+is+made+available+under+CC-BY+4%2E0%2E+https%3A%2F%2Fcreativecommons%2Eorg%2Flicenses%2Fby%2F4%2E0%22">This full text is made available under CC-BY 4.0. https://creativecommons.org/licenses/by/4.0</searchLink> – Name: Abstract Label: Description Group: Ab Data: Seasonal habitats formed by the brown algae Sargassum in Hong Kong provide important nursery grounds for juvenile fishes, including several commercially relevant species. This study used purse-seining and cage-trapping to explore the spatial-seasonal variation of juvenile fish assemblages in three coastal habitats, namely Sargassum beds, rocky reefs, and mangrove mudflats in three regions in Hong Kong, China. It also examined the influence of Sargassum canopy complexity on juvenile fish assemblage. Around 110,363 juvenile fish from 145 species were collected in total, including 58 unique to Sargassum . Over 92% of fishes were <3 cm long, mostly found during the peak Sargassum season. Differences in fish assemblages amongst the three types of coastal habitats and among the three regions were driven by seasons. Several commercially important species (e.g. Rhabdosargus sarba and Pagrus major ) were at least twice as abundant in Sargassum beds than rocky reefs during the peak season. Furthermore, a large group of juvenile fishes (61 species) had a substantial proportion (> 50%) of their relative abundance within Sargassum beds, in contrast to 13 and 26 species in rocky reefs and mangrove mudflats, respectively. Juvenile fish assemblages were structured by habitat-scale three-dimensional complexity, particularly the presence of canopy-forming Sargassum , whereas within-bed variation in canopy density or biomass had limited effects. The subtropical Sargassum beds host a greater diversity and biomass of juvenile fish when Sargassum flourishes. We conclude that seasonal Sargassum in subtropical coastal waters provides an important habitat refuge for juvenile fishes and contributes to fish recruitment. Such macroalgal habitats should be preserved and protected. © The Author(s) 2026. Published by Oxford University Press on behalf of International Council for the Exploration of the Sea. – Name: TypeDocument Label: Document Type Group: TypDoc Data: article in journal/newspaper – Name: Format Label: File Description Group: SrcInfo Data: application/pdf – Name: Language Label: Language Group: Lang Data: English – Name: ISSN Label: ISSN Group: ISSN Data: 1054-3139<br />1095-9289 – Name: NoteTitleSource Label: Relation Group: SrcInfo Data: info:eu-repo/semantics/altIdentifier/wos/001769375000001; info:eu-repo/semantics/altIdentifier/hdl/https://hdl.handle.net/2031/69f655c3-da8a-4a86-a6ce-600fec63c62e; info:eu-repo/semantics/altIdentifier/pissn/1054-3139; info:eu-repo/semantics/altIdentifier/eissn/1095-9289 – Name: DOI Label: DOI Group: ID Data: 10.1093/icesjms/fsag083 – Name: URL Label: Availability Group: URL Data: https://scholars.cityu.edu.hk/en/publications/69f655c3-da8a-4a86-a6ce-600fec63c62e<br />https://scholars.cityu.edu.hk/ws/files/494146419/491115073.pdf<br />https://doi.org/10.1093/icesjms/fsag083<br />https://hdl.handle.net/2031/69f655c3-da8a-4a86-a6ce-600fec63c62e<br />https://www.scopus.com/pages/publications/105038913263<br />https://www.scopus.com/pages/publications/105038913263#tab=impact – Name: Copyright Label: Rights Group: Cpyrght Data: info:eu-repo/semantics/openAccess ; http://creativecommons.org/licenses/by/4.0/ – Name: AN Label: Accession Number Group: ID Data: edsbas.3DA82CFB
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RecordInfo	BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1093/icesjms/fsag083 Languages: – Text: English Subjects: – SubjectFull: juvenile fish nursery Type: general – SubjectFull: macroalgae seasonality Type: general – SubjectFull: recruitment hotspots Type: general – SubjectFull: Sargassumhabitat Type: general – SubjectFull: subtropical reef ecosystem Type: general – SubjectFull: This full text is made available under CC-BY 4.0. https://creativecommons.org/licenses/by/4.0 Type: general Titles: – TitleFull: Seasonal growth of macroalgae ( Sargassum ) shapes juvenile fish assemblages on subtropical reefs Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Chan, Sharon S. W. – PersonEntity: Name: NameFull: Lee, Gabriel Y. – PersonEntity: Name: NameFull: Leung, Priscilla T. Y. – PersonEntity: Name: NameFull: Wai, Tak-Cheung – PersonEntity: Name: NameFull: Liu, Min – PersonEntity: Name: NameFull: Yan, Meng – PersonEntity: Name: NameFull: Leung, Kenneth M. Y. – PersonEntity: Name: NameFull: Lam, Paul K. S. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 01 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 10543139 – Type: issn-print Value: 10959289 – Type: issn-locals Value: edsbas – Type: issn-locals Value: edsbas.oa Titles: – TitleFull: Chan, S S W, Lee, G Y, Leung, P T Y, Wai, T-C, Liu, M, Yan, M, Leung, K M Y & Lam, P K S 2026, 'Seasonal growth of macroalgae ( Sargassum ) shapes juvenile fish assemblages on subtropical reefs', ICES Journal of Marine Science, vol. 83, no. 5, fsag083. https://doi.org/10.1093/icesjms/fsag083 Type: main
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