Table 2. Vitellogenin in the whole body homogenate of the male zebrafish after the tonalide exposure.

Group	Number of analysed samples	% of positive samples	Range of detected concentrations (ng/ml)
Control	10	0	–
50 ng/l	10	0	–
500 ng/l	10	10	2 788#
5 000 ng/l	10	20	1 437–6 512
50 000 ng/l	10	30	497–8 966

^#Only one positive sample was found

No significant changes were recorded among the groups (P > 0.05)