Abstract
ABSTRACT Over the past decade, Australian abalone were produced using a range of commercially formulated grow-out diets with crude protein (CP) levels ranging from 27% to 30% throughout their production cycle. Recent research identified higher optimal dietary CP levels of greater than or equal to 35%for younger than 1-y-old abalone at higher water temperatures (20–22°C). To validate the results of the laboratory-based research, the current trial was designed to investigate the effect of feeding two different commerciallymanufactured diets (standard-protein diet, 32%CP, versus a high-protein diet, 39%CP) to hybrid abalone (Haliotis laevigata ×Haliotis rubra; initial weight: 3.10 g) on growth performance, feed utilization, and sales revenue under on-farm conditions. During this 18-mo trial, abalone were cultured using normal commercial practices over two summer periods at Great Southern Waters abalone farm (Indented Head, VIC, Australia). A significant improvement in specific growth rate (SGR) led to a 9% i...
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