Dredge oyster
| Dredge oyster | |
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T. chilensis
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| Binomial name | |
| Tiostrea chilensis |
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Ostrea chilensis |
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The dredge oyster[1] or Bluff oyster,[2] Tiostrea chilensis, known in Chile as ostra chilena, is a species of marine bivalve mollusc in the family Ostreidae.
Contents
Distribution
This species is native to Chile and New Zealand.
Also, a self-sustaining population in the Menai Strait was accidentally introduced from the Fisheries Laboratory, Conwy, in 1965 or 1966 (sources disagree).
Habitat
This bivalve is found from low tide to depths of up to 35 m.
Description
Its length is up to 105 mm, width up to 70 mm, and inflation up to 33 mm.
Commercial importance
In New Zealand, they are a prized delicacy, and harvested from March to August from the Foveaux Strait oyster fishery, which centres on the town of Bluff (hence the local name).[2] From the early 1980s, the fishery went into serious decline, due to the outbreak of an oyster parasite, Bonamia exitiosa, with the disease killing an estimated billion oysters between 2000 and 2003.[2] The population has been recovering since 2003, with fishermen voluntarily limiting the catch to half the allowable to aid the revival.[2] [3]
Other
Changes in river flows in Southland, due to farming and especially power generation, carrying less limestone deposits into the Strait, is therefore believed to have caused an increase in susceptibility to Bonamia, as well as lower growth rates for some seasons in the past, but little evidence supports this and it seems only coincidental.
References
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<references />, or <references group="..." />External links
- ZipCodeZoo — Tiostrea chilensis
- The National Centre for Fisheries & Aquaculture's page on Bluff oysters (Tiostrea chilensis)
- JNCC: Tiostrea chilensis
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- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ H.J. Cranfield, A. Dunn, I.J. Doonan and K.P. Michael 2005. Bonamia exitiosa epizootic in Ostrea chilensis from Foveaux Strait, southern New Zealand between 1986 and 1992. ICES J. Mar. Sci. (2005) 62 (1): 3-13 doi:10.1016/j.icesjms.2004.06.021
