Fig. 7. Effect of goitrogen treatment on pelvic fin development. (A) A significantly smaller proportion of fish in the methimazole and KClO₄ treatments developed pelvic fins when compared to the control (P=0.0009). Values are means ± s.e.m. (N=7-8) and letters indicate pairwise differences (Tukey HSD test). (B) The proportion of fish with pelvic fins plotted against rearing temperature for each treatment. Elevated rearing temperatures resulted in a lower proportion of fish developing pelvic fins (P=0.0196). Each data point represents the mean of two replicated buckets per temperature value (except the point indicated by asterisk, which represents a single bucket).