(Table 6) Regression equations of effect of age on mercury concentration in muscle, liver and liver and muscle mercury concentration ratio. (Fish species with different distribution in heavily and lightly contaminated localities were not included.)

	Hg in muscle				Hg in liver				Hg in liver / Hg in muscle
	intercept	slope	r2	P	intercept	slope	r2	P	intercept	slope	r2	P
Anguilla anguilla	0.526	-0.010	0.004	0.726	1.085	-0.012	0.001	0.911	1.674	0.037	0.002	0.825
Aspius aspius	0.491	0.135	0.197	0.044	2.120	-0.021	0.001	0.923	3.027	-0.242	0.096	0.196
Barbus barbus	0.233	0.070	0.036	0.296	0.089	0.077	0.038	0.287	0.344	0.073	0.058	0.183
Blicca bjoercna	0.358	0.006	0.003	0.689	-0.002	0.118	0.089	0.025	0.569	0.147	0.064	0.060
Carassius auratus	0.173	0.016	0.105	0.099	0.088	0.004	0.016	0.534	0.489	-0.005	0.002	0.835
Gymnocephalus cernua	0.212	-0.011	0.228	0.523
Leuciscus cephalus	0.308	0.032	0.018	0.161	0.058	0.080	0.051	0.017	0.418	0.071	0.085	0.002
Leuciscus idus	0.350	-0.011	0.013	0.493	0.458	-0.004	0.000	0.931	0.605	0.106	0.032	0.294
Leuciscus leuciscus	0.229	0.042	0.447	0.035	0.283	0.008	0.006	0.839	1.045	-0.062	0.051	0.531
Perca fluviatilis	-0.147	0.335	0.254	< 0.001	-0.226	0.379	0.335	< 0.001	0.925	0.056	0.009	0.328
Rutilus rutilus	0.236	0.015	0.018	0.116	0.255	0.028	0.013	0.218	0.855	0.048	0.007	0.346
Salmo trutta	0.289	-0.082	0.435	0.341
Stizostedion lucioperca	0.710	-0.023	0.010	0.427	0.583	-0.005	0.000	0.913	0.881	-0.014	0.002	0.708
Tinca tinca	0.692	-0.047	0.106	0.085	0.434	-0.021	0.010	0.625	0.656	-0.017	0.007	0.693
Vimba vimba	0.746	-0.052	0.030	0.682	0.177	0.124	0.016	0.763	-1.050	0.492	0.132	0.377