dc.contributor.author | Hicks, Brendan J. | |
dc.contributor.author | West, David William | |
dc.contributor.author | Barry, B. J. | |
dc.contributor.author | Markwitz, A. | |
dc.contributor.author | Baker, Cindy F. | |
dc.contributor.author | Mitchell, C.P. | |
dc.date.accessioned | 2009-07-07T04:46:12Z | |
dc.date.available | 2009-07-07T04:46:12Z | |
dc.date.issued | 2005 | |
dc.identifier.citation | Hicks, B. J., West, D. W., Barry, B. J., Markwitz, A., Baker, C. F. & Mitchell, C. P. (2005). Chronosequences of strontium in the otoliths of two New Zealand migratory freshwater fish, inanga (Galaxias maculatus) and koaro (G. brevipinnis). International Journal of Particle Induced X-ray Emission 15(3-4), 95-101. | en |
dc.identifier.uri | https://hdl.handle.net/10289/2211 | |
dc.description.abstract | Half of the freshwater fish fauna in New Zealand is diadromous (i.e., migrates between the sea and freshwater); unimpeded access to and from the sea is important for the conservation of diadromous fish. The genus Galaxias (Galaxiidae: Osmeriformes) contains five diadromous species that spawn in freshwater, migrate to sea as larvae, and then migrate back into freshwater as 50-55-mm juveniles. Microchemistry of the otolith, a calcified structure in the fish's head, allows an independent test of assumptions about these migrations. Concentric layers of CaCO3 with some Sr as SrCO3 comprise the otolith, creating a chronosequence that reflects a fish's migratory history. More Sr accumulates in the otolith when a fish is in seawater than when it is in freshwater. High-resolution nuclear microscopy was used to measure the molar ratios of Sr/Ca in two galaxiid species. Otoliths of inanga (G. maculatus) caught in freshwater all showed a central zone of 100-200 μm in radius with Sr/Ca of 0.008-0.012, indicating early rearing in the sea. Sr/Ca values decreased to 0.001-0.002 as the fish moved into freshwater. Of six adult koaro (G. brevipinnis) caught in a river with sea access and no lakes, five had migrated to sea but one had not, raising questions about the generalized assumptions of migration. | en |
dc.language.iso | en | |
dc.publisher | World Scientific Publishing Co. Pte. Ltd. | en_NZ |
dc.rights | Full text of this article may be requested by emailing AProf Brendan J. Hicks: hicksbj@waikato.ac.nz | en |
dc.subject | otolith microchemistry | en |
dc.subject | migratory history | en |
dc.subject | freshwater fish | en |
dc.subject | calcium | en |
dc.subject | strontium | en |
dc.title | Chronosequences of strontium in the otoliths of two New Zealand migratory freshwater fish, inanga (Galaxias maculatus) and koaro (G. brevipinnis) | en |
dc.type | Journal Article | en |
dc.identifier.doi | 10.1142/S0129083505000398 | en |
dc.relation.isPartOf | International Journal of PIXE | en_NZ |
pubs.begin-page | 95 | en_NZ |
pubs.elements-id | 31611 | |
pubs.end-page | 101 | en_NZ |
pubs.issue | 3&4 | en_NZ |
pubs.volume | 15 | en_NZ |