Evaluation of colchicine sensitivity of Haliotis discus hannai diploid and triploid larvae at two developmental stages, trochophore and veliger. After the larvae were treated with colchicine or not, the number of larvae that showed ciliary movement were visually counted and its percentages were calculated. No significant difference was detected among all treatment groups in both diploid (A) and triploid (B) larvae. All values are expressed as mean ± standard deviation of three independent experiments.