Fig. 7. Radioactivity of iodide, thyroid hormone and thyroid hormone conjugates fractions, shown as a percentage of the total dose remaining in the fish at the time of sampling per gram of tissue, in the bile (A) and the ambient water (B), following Sephadex LH-20 chromatography at 2, 24, 48 and 96 h after i.p. ¹²⁵I injection in tilapia (•, N=6) and carp (, N=6). Results are means ± s.d. One-way ANOVA was used for statistical evaluation. Significantly different levels of radioactivity compared with that at 2 h are indicated for tilapia (^**P<0.01, ^***P<0.001) and carp (+P<0.05, ++P<0.01, +++P<0.001).