Figure 2.

Figure 2.

Trophic transfer of C-14 to zebrafish mainly being restrained in the brain. (a) Uptake of C-14 by D. rerio through direct exposure to DIC-14 solution with a concentration of 2 bq mL⁻¹ or trophic transfer from C-14-accumulated D. magna with a nominal concentration of 2 bq mg⁻¹. (b) The elimination of C-14 from zebrafish via continuous feeding of clean daphnia. (c) Distribution of C-14 in tissues of zebrafish after 7 days of accumulation and subsequently 7 days of depuration. (d) Uptake of C-14 in the brain of zebrafish during 7 days of exposure and subsequent 7 days of elimination. Data points with the same letter (e.g. a, b and c) are not significantly different from one another; asterisks (*) or NS indicate statistical significance (*P < 0.05, **P < 0.01, ***P < 0.001 and ****P < 0.0001).