Table 1.

Sample information

Population	Year of sampling	Sample code	Source of DNA	Taxonomy: ELW or NSH	Geographical region	Indigenous or reintroduced	Life history	Sample size
Vidaa River	2002	VID02	Adipose fin	NSH	Wadden (North) Sea	Indigenous	Anadromous (high salinity)	50
Vidaa River	1994	VID94	Adipose fin	NSH	Wadden (North) Sea	Indigenous	Anadromous (high salinity)	40
Vidaa River	1980	VID80	Dried scales	NSH	Wadden (North) Sea	Indigenous	Anadromous (high salinity)	39
Ribe River	2004	RIB04	Adipose fin	NSH	Wadden (North) Sea	Reintroduced	Anadromous (high salinity)	49
Ribe River	1994	RIB94	Adipose fin	NSH	Wadden (North) Sea	Reintroduced	Anadromous (high salinity)	29
Varde River	2004	VAR04	Adipose fin	NSH	Wadden (North) Sea	Reintroduced	Anadromous (high salinity)	36
Varde River	1994	VAR94	Adipose fin	NSH	Wadden (North) Sea	Reintroduced	Anadromous (high salinity)	19
Ringkøbing Fjord	2004	RIN04	Adipose fin	ELW	North Sea	Indigenous	Anadromous (brackish)	33
Ringkøbing Fjord	1995	RIN95	Adipose fin	ELW	North Sea	Indigenous	Anadromous (brackish)	50
Ringkøbing Fjord	1977	RIN77	Dried scales	ELW	North Sea	Indigenous	Anadromous (brackish)	37
Nissum Fjord	1995	NIS	Adipose fin	ELW	North Sea	Indigenous	Anadromous (brackish)	50
Kilen	1995	KIL	Adipose fin	ELW	The Limfjord	Indigenous	Lake	24
Lake Flynder	1995	FLY	Adipose fin	ELW	The Limfjord	Indigenous	Lake	40
Gudenaa River	1996	GUD	Adipose fin	ELW	Kattegat Sea	Indigenous	Anadromous (brackish)	35
Rostock (Achterwasser)	1996	ROS	Adipose fin	ELW	Baltic Sea	Indigenous	Anadromous (brackish)	34

Information about the sampled populations, year of sampling, sample codes, source of DNA, taxonomic status, geographical region of the sample localities, the indigenous or reintroduced status of populations and sample size. ELW denotes European lake whitefish (Coregonus lavaretus) and NSH North Sea Houting (C. oxyrhynchus).