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Studies on the New Zealand Mud-Oyster: Ostrea Lutaria Hutton, 1873.

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dc.contributor.author Hollis, P. J.
dc.date.accessioned 2009-12-15T22:59:06Z
dc.date.accessioned 2022-10-20T17:55:32Z
dc.date.available 2009-12-15T22:59:06Z
dc.date.available 2022-10-20T17:55:32Z
dc.date.copyright 1962
dc.date.issued 1962
dc.identifier.uri https://ir.wgtn.ac.nz/handle/123456789/22406
dc.description.abstract Two species of Ostrea Linnaeus are present in New Zealand: O. lutaria Hutton (the mud-oyster) and O. heffordi Finlay (the southern rock-oyster). Studies on O. lutaria show that it is distinct from the South Australian mud-oyster, O. angasi Sowerby but has O. charlottae Finlay as a synonym. O. lutaria is typical of the genus Ostrea in anatomy; it is larviparous and hermaphroditic, spawning for at least eight months of the year between August and March, at temperatures as low as 10'C. ; is probably protandric with regular alternating female and male phases; becomes hermaphroditic after the second or third breeding season. Fecundity is about 1,000,000; egg size at liberation 170u. - 200u. Larvae are incubated for about 20 days; are ready to settle when they measure 0.44mm. x 0.34mm. A study of the pelagic bivalve larvae of Evans Bay has produced no free swimming oyster larvae ; the large size of the veliger and the absence of larvae in the plankton suggests that the free swimming phase is extremely short, probably less than a week. The settling larva exhibits an exploratory phase; the spat doubles its size in 24 hours and all the gills are present in a spat measuring 5.5mm. in length. en_NZ
dc.format pdf en_NZ
dc.language en_NZ
dc.language.iso en_NZ
dc.publisher Te Herenga Waka—Victoria University of Wellington en_NZ
dc.subject Wellington Harbour en_NZ
dc.subject Evans Bay en_NZ
dc.subject Identification en_NZ
dc.subject Oysters en_NZ
dc.title Studies on the New Zealand Mud-Oyster: Ostrea Lutaria Hutton, 1873. en_NZ
dc.type Text en_NZ
vuwschema.contributor.unit School of Biological Sciences en_NZ
vuwschema.subject.marsden 270599 Zoology not Elsewhere Classified en_NZ
vuwschema.type.vuw Awarded Research Masters Thesis en_NZ
thesis.degree.discipline Zoology en_NZ
thesis.degree.grantor Te Herenga Waka—Victoria University of Wellington en_NZ
thesis.degree.level Masters en_NZ
thesis.degree.name Master of Science en_NZ

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