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Experimental deep water culture of the sydney rock oyster crassostrea commercialis equals saccostrea cucullata part 1 growth of vertical clumps of oysters ren



Experimental deep water culture of the sydney rock oyster crassostrea commercialis equals saccostrea cucullata part 1 growth of vertical clumps of oysters ren



Aquaculture 16(2): 127-140



Japanese style ren, consisting of scallop shells encrusted with small Sydney rock oysters [C. commercialis] and strung on vertical wires, were grown at 23 estuarine stations along the New South Wales coast [Australia] for up to 21 mo. Wt increments of ren were used to evaluate growth rates of oysters in non-cumulative (3-4 mo. immersion) and cumulative (6-21 mo. immersion) series. Oyster wt increased at a rate of approximately 10%/mo., which was considered suitable for commercial production, but estimated labor costs to make up the ren were high. Mortality rate was 6.3%/3-4 mo. immersion. Gaping oysters, through natural mortality, winter mortality, the haplosporidian parasite Marteilia sydneyi and other causes, accounted for 4.5%. Broken oysters, resulting from fish and crab predation, accounted for 1.8%. Mortality caused by the polychaete mudworm Polydora websteri was negligible, only 1.7% of the 4.5% gapers showed the characteristic blisters.

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Accession: 005422572

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