Introduction Greenlip abalone (Haliotis laevigata) are primarily grown in land- based systems throughout southern Australia. The water temperature during grow-out affects almost every aspect of on-farm production (Britz et al., 1997), and can range from below 10 ecin Tasmania during winter to above 24 ec in South Australia during summer. The optimal emperature for growth for a Tasmanian greenlip abalone strain (82 mm shell length ISL) was 18.3 "c (Gilroy and Edwards, 1998). while the optimal water temperature for growth for a South Australian