Prospects of fish scale and fin samples usage for nonlethal monitoring of metal contamination: a study on five fish species from the Danube River | Knowledge and Management of Aquatic Ecosystems

Anthropogenic impact on freshwater habitats, communities and ecosystem functioning

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Table 4

Metal and trace element concentrations in muscle, scales, and anal fin (means ± standard deviation). Concentrations are expressed as µg g⁻¹.

Element	Tissue	Abramis brama (common bream)	Blicca bjoerkna (white bream)	Sander lucioperca (pikeperch)	Esox lucius (northern pike)	Silurus glanis (wels catfish)^*
As	Muscle	0.227 ± 0.095	0.416 ± 0.132	0.459 ± 0.280	0.685 ± 0.807	0.131 ± 0.097
	Scale	0.083 ± 0.020	0.058 ± 0.018	0.201 ± 0.144	0.381 ± 0.502	–
	Fin	0.336 ± 0.140	0.294 ± 0.084	0.491 ± 0.429	0.425 ± 0.665	0.767 ± 0.391
Cd	Muscle	0.003 ± 0.001	0.005 ± 0.003	0.004 ± 0.004	0.006 ± 0.003	0.004 ± 0.007
	Scale	0.004 ± 0.003	0.008 ± 0.009	0.007 ± 0.005	0.059 ± 0.096	–
	Fin	0.004 ± 0.003	0.206 ± 0.628	0.013 ± 0.013	0.020 ± 0.024	0.009 ± 0.008
Co	Muscle	0.219 ± 0.103	0.150 ± 0.024	0.221 ± 0.127	0.151 ± 0.049	0.018 ± 0.023
	Scale	0.208 ± 0.072	0.192 ± 0.028	0.179 ± 0.130	0.253 ± 0.130	–
	Fin	0.297 ± 0.076	0.193 ± 0.099	0.178 ± 0.042	0.258 ± 0.185	0.051 ± 0.024
Cr	Muscle	0.132 ± 0.109	1.138 ± 1.751	0.164 ± 0.128	0.074 ± 0.067	0.138 ± 0.325
	Scale	0.172 ± 0.136	0.113 ± 0.047	0.379 ± 0.317	0.752 ± 0.949	–
	Fin	0.239 ± 0.261	0.158 ± 0.087	0.620 ± 0.630	0.161 ± 0.137	0.083 ± 0.084
Cu	Muscle	1.523 ± 0.787	2.049 ± 1.616	0.914 ± 0.797	1.690 ± 1.136	0.950 ± 0.656
	Scale	0.691 ± 0.292	0.596 ± 0.271	0.855 ± 0.419	1.475 ± 1.369	–
	Fin	1.410 ± 0.488	1.728 ± 1.122	1.308 ± 0.483	1.604 ± 0.570	0.668 ± 0.589
Fe	Muscle	27.726 ± 14.143	40.373 ± 16.494	13.162 ± 5.976	46.444 ± 25.355	19.464 ± 15.075
	Scale	83.279 ± 33.045	131.145 ± 163.057	121.293 ± 94.258	324.051 ± 446.000	–
	Fin	75.696 ± 63.152	99.552 ± 61.922	53.117 ± 15.285	94.401 ± 64.179	34.014 ± 16.097
Hg	Muscle	0.286 ± 0.176	0.471 ± 0.203	1.427 ± 0.842	0.886 ± 0.341	1.599 ± 0.535
	Scale	0.002 ± oe-7	0.002 ± oe-7	0.015 ± 0.018	0.009 ± 0.008	–
	Fin	0.004 ± 0.002	0.006 ± 0.005	0.066 ± 0.078	0.016 ± 0.007	0.095 ± 0.041
Mn	Muscle	5.066 ± 4.155	2.345 ± 0.442	1.319 ± 0.754	3.446 ± 1.326	0.674 ± 0.401
	Scale	67.934 ± 23.250	29.219 ± 6.975	35.119 ± 6.155	80.293 ± 28.446	–
	Fin	87.438 ± 28.827	43.615 ± 10.330	31.199 ± 6.595	68.523 ± 21.533	14.475 ± 7.592
Se	Muscle	1.450 ± 0.316	0.921 ± 0.267	1.590 ± 0.233	1.136 ± 0.373	0.905 ± 0.333
	Scale	0.890 ± 0.321	0.674 ± 0.193	0.647 ± 0.177	1.168 ± 0.236	–
	Fin	1.086 ± 0.531	0.818 ± 0.344	1.192 ± 0.501	1.363 ± 0.503	0.824 ± 0.303
Zn	Muscle	17.056 ± 3.942	14.715 ± 3.409	16.173 ± 5.873	21.319 ± 6.956	19.621 ± 10.201
	Scale	79.554 ± 11.848	55.348 ± 2.683	82.130 ± 11.899	118.742 ± 26.260	–
	Fin	329.128 ± 59.971	222.900 ± 71.651	100.799 ± 27.967	175.889 ± 53.617	104.246 ± 39.346

^*Scales in wels catfish have not been analyzed since the species does not have them.

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