Opportunistic discovery of giant kōkopu (Galaxias argenteus) spawning in a tidal reach: site description and implications

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dc.contributor.authorOrchard, Shane
dc.contributor.authorWilkinson S
dc.date.accessioned2025-01-28T23:15:59Z
dc.date.available2025-01-28T23:15:59Z
dc.date.issued2023
dc.description.abstractThis paper reports the first observation of a giant kōkopu (Galaxias argenteus) spawning site in a tidal waterway and illustrates the usefulness of DNA barcoding for opportunistic discoveries that in this case involved the collection of a single egg. We describe key characteristics of the spawning site and compare them with the only other recorded giant kōkopu spawning location which was found in a much different environmental context far inland. This is also a novel observation of giant kōkopu and īnanga (G. maculatus) spawning on the same section of riverbank. Eggs from the two species occupied the same vertical elevation band, which together the consideration of tidal heights and the egg development stage suggest that the spawning event was triggered by a tidal cue. We discuss the implications of more widespread giant kōkopu spawning in tidal waterways, including historical perspectives contributing to their decline and the potential to reverse these trends.
dc.identifier.citationOrchard S, Wilkinson S (2023). Opportunistic discovery of giant kōkopu (Galaxias argenteus) spawning in a tidal reach: site description and implications. New Zealand Journal of Marine and Freshwater Research. 58(4). 577-590.
dc.identifier.doihttp://doi.org/10.1080/00288330.2023.2280717
dc.identifier.issn0028-8330
dc.identifier.issn1175-8805
dc.identifier.urihttps://hdl.handle.net/10092/107765
dc.languageen
dc.publisherInforma UK Limited
dc.rightsAll rights reserved unless otherwise stated
dc.rights.urihttp://hdl.handle.net/10092/17651
dc.subjectmigratory species
dc.subjectbiogeography
dc.subjectspatial planning
dc.subjectcritical habitat
dc.subjectdetection methods
dc.subjectDNA analysis
dc.subjectecohydrology
dc.subjectmarine-freshwater interface
dc.subjectwater level fluctuations
dc.subjectspawning cues
dc.subject.anzsrc31 - Biological sciences::3103 - Ecology::310305 - Marine and estuarine ecology (incl. marine ichthyology)
dc.subject.anzsrc41 - Environmental sciences::4104 - Environmental management::410401 - Conservation and biodiversity
dc.subject.anzsrc41 - Environmental sciences::4104 - Environmental management::410407 - Wildlife and habitat management
dc.subject.anzsrc37 - Earth sciences::3707 - Hydrology::370702 - Ecohydrology
dc.titleOpportunistic discovery of giant kōkopu (Galaxias argenteus) spawning in a tidal reach: site description and implications
dc.typeJournal Article
uc.collegeFaculty of Science
uc.departmentWaterways Centre for Freshwater Management
uc.departmentSchool of Biological Sciences
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