The performance of diploid and triploid selected and control oysters was compared at three sites
to determine if the improvements in growth of selected oyster line (L2) Sydney rock oysters were
additive to the faster growth of triploids. After a grow-out period of 32 months, both mean whole
weights and shell heights were in the order: L2 triploids>control triploids>L2 diploids>control
diploids. Mean whole weights of different oyster lines were all significantly different ( p < 0.05). A
significant ( p = 0.02) siteline interaction effect on oyster weights was also detected. On average,
L2 triploids were 74% heavier than control diploids, indicating that growth improvements from
selective breeding and triploidy were at least additive and could reduce the time to market by at least
10 months. Oyster type had no effect on the meat condition index, percent cavity volume, percent
shell weight or cumulative mortality, but did affect whole weight/shell height ratios after 21 months
grow-out.
The performance of diploid and triploid selected and control oysters was compared at three sitesto determine if the improvements in growth of selected oyster line (L2) Sydney rock oysters wereadditive to the faster growth of triploids. After a grow-out period of 32 months, both mean wholeweights and shell heights were in the order: L2 triploids>control triploids>L2 diploids>controldiploids. Mean whole weights of different oyster lines were all significantly different ( p < 0.05). Asignificant ( p = 0.02) siteline interaction effect on oyster weights was also detected. On average,L2 triploids were 74% heavier than control diploids, indicating that growth improvements fromselective breeding and triploidy were at least additive and could reduce the time to market by at least10 months. Oyster type had no effect on the meat condition index, percent cavity volume, percentshell weight or cumulative mortality, but did affect whole weight/shell height ratios after 21 monthsgrow-out.
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