| Summary: | Carotenoids, known to enhance survival, heat tolerance, and bacterial resistance, play an essential role in the nutrition of economically important aquatic animals. This study specifically examined their impact as feed additives on the abalone <i>Haliotis gigantea</i>. We prepared 13 compound feeds with varying levels of astaxanthin, zeaxanthin, and <i>β</i>-carotene, and administered them to both common-footed and orange-footed <i>H. gigantea</i>. The survival rate of <i>H. gigantea</i> was about 70–80%, with no significant differences in survival observed among the various carotenoid-supplemented feeding groups or when compared with the control group, nor between orange-footed and common-footed individuals. In heat attachment duration experiments, orange-foot abalones exhibited longer attachment durations with certain concentrations of astaxanthin and zeaxanthin, whereas common-foot abalones showed extended durations with astaxanthin, zeaxanthin, and <i>β</i>-carotene, indicating that common-foot abalones might benefit more from these carotenoids. Additionally, our results showed similar patterns and levels of <i>Vibrio harveyi</i> AP37 resistance in both orange-footed and common-footed <i>H. gigantea</i>, suggesting a uniform response to carotenoid supplementation in their bacterial defense mechanisms. This study suggests the potential benefits of carotenoid supplementation in <i>H. gigantea</i> and contributes to the theoretical basis for developing high-quality artificial compound feeds.
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