Multilocus genotype data of 2803 Salmo salar individuals from the River Nivelle (France) genotyped at 14 microsatellites as described in Bacles CFE, Bouchard C, Lange F, Manicki A, Tentelier C, Lepais O, 2018, Estimating the effective number of breeders from single parr samples for conservation monitoring of wild populations of Atlantic salmon (Salmo salar), Journal of Fish Biology. Contact: olivier.lepais@inra.fr ### Description of the data file Dryad_Bacles-et-al_JFB-2018.xlsx Column Description Individual ID Unique identifier given to Salmo salar individuals caught at least once in the river Nivelle between spring 2004 and autumn 2014. SSA refers to individuals first caught as anadromous adults on their first or second upstream migration and SSJ refers to individuals first caught as Young of the year (YOY) or resident parr (aged 1+ or 2+) Individual Sex Sex was determined using a combination of phenotypic traits (P) and one sex-linked (male) genetic marker Yanng400 (G). M= male, F= female, MP or FP = sex determined using P information only (G missing), MG or FG= sex determined using G information only (P missing), MPD or MGD = divergent information between P and G scored as male , U=unknown Sssp2215A First allele at locus Sssp2215 Sssp2215B Second allele at locus Sssp2215 Ssa171A First allele at locus Ssa171 Ssa171B Second allele at locus Ssa171 Sssp2216A First allele at locus Sssp2216 Sssp2216B Second allele at locus Sssp2216 Ssa197A First allele at locus Ssa197 Ssa197B Second allele at locus Ssa197 Sssp2210A First allele at locus Sssp2210 Sssp2210B Second allele at locus Sssp2210 EST123A First allele at locus EST123 EST123B Second allele at locus EST123 EST41A First allele at locus EST41 EST41B Second allele at locus EST41 Ssosl85A First allele at locus Ssosl85 Ssosl85B Second allele at locus Ssosl85 EST19A First allele at locus EST19 EST19B Second allele at locus EST19 Ssa407A First allele at locus Ssa407 Ssa407B Second allele at locus Ssa407 EST107A First allele at locus EST107 EST107B Second allele at locus EST107 Ssa412A First allele at locus Ssa412 Ssa412B Second allele at locus Ssa412 EST28A First allele at locus EST28 EST28B Second allele at locus EST28 SsaD486A First allele at locus SsaD486 SsaD486B Second allele at locus SsaD486 Year of birth (0+) Year of birth inferred from catch (dd/mm/yyyy) or scale age (yyyy) Sampling site 0+ Site along the river Nivelle where YOY were caught (electrofishing) Freshwater residency year 1+ (D1+) Year of parr residency 1+ inferred from catch (dd/mm/yyyy) or scale age (yyyy) Sampling site D1+ Site along the river Nivelle where parr 1+ were caught (electrofishing) Freshwater residency year 2+ ( D2+) Year of parr residency 2+ inferred from catch (dd/mm/yyyy) or scale age (yyyy) Sampling site D2+ Site along the river Nivelle where parr 2+ were caught (electrofishing) Year of first upstream migration (ANA 1) Year of first upstream migration from catch at impassable dams (dd/mm/yyyy) or inferred from scale age (yyyy) Year of second upstream migration (ANA 2) Year of second upstream migration from catch at impassable dams (dd/mm/yyyy)