Table 1. Environmental DNA (eDNA) samples (final volume 100uL) obtained from 3L water samples in the ports from Asturias (Northern Spain, Bay of Biscay).

Sample	eDNA Conc. (ng/ul)	COI Amplicon Library fragm 800bp-Conc. (molecules/ul)	18S Amplicon Library fragm 500bp-Conc. (molecules/ul)
Eo	3.649	1.62 X 1010	4.66 X 109
Luarca	2.072	1.08 X 1010	3.72 X 109
Cudillero	0.457	2.50 X 1010	-
Aviles	2.628	4.55 X 109	4.29 X 109
Gijon	6.262	5.69 X 109	2.50 X 1010
Villaviciosa	0.606	1.25 X 1010	-
Ribadesella	1.611	1.97 X 1010	1.14 X 109
Llanes	5.552	2.51 X 1010	2.17 X 1010

The—symbol means that not PCRs were obtained from these samples.