Commercialisation of Triploid Sydney Rock Oysters Saccostrea Glomerata in New South Wales growth survival and meat condition

To aid the commercialisation of triploid technology for Sydney rock oysters (Succostreu glomerafa) in NSW, triploids and diploids were evaluated for growth, mortality and meat condition on commercial oyster farms throughout the state. After 2% years, triploids were on average 30.7% heavier and 8.6% larger in shell height than same parent diploids. Mortality of triploids was significantly lower (p < 0.01) or not significantly different @ > 0.05) from that of diploids at 12 of the 13 sites. Average cumulative mortality after 2% years across the 13 sites was 28% for diploids compared to only 16% for triploids. Performance of triploids over diploids varied considerably between sites. Wild-caught diploids had lower growth rates and higher mortality than both diploid and triploid hatchery stock.