Table 1.

Overview of Icelandic cod samples used in this study: year, date and subarea of sampling (see Note for corresponding coordinates), sampling depth (meters; entries with asterisks show depth distributions [10–90% quantiles] within the subarea for those samples where actual depth of the catch was not available), number of individuals (n), amplification success (A_succ), proportion of females (P_fem), mean total length (cm; TL_mean), length range (cm; TL_range), mean age (years; A_mean), age range (years; A_range). For all samples, DNA was derived from archived otoliths with the exception of 2002 for which DNA was obtained from fresh gills

Year	Date	Subarea	Depth	n	Asucc	Pfem	TLmean	TLrange	Amean	Arange
1948	18/4–22/4	BRE	100	132	68.9	83.9	87.48	67–150	9.84	5–16
1957	20/3–2/4	SW	37	111	95.6	40.7	93.95	73–136	9.38	5–19
1959	14/4	SW	37–74*	90	83.3	21.3	96.22	78–115	9.64	6–14
1966	15/4	SW	37–74*	95	94.7	51.1	91.81	74–112	8.42	5–13
1972	6/4–8/4	FAX	38–83*	94	88.3	44.6	87.12	75–100	8.54	4–11
1973	3/5	FAX	68	95	64.2	59.0	90.37	76–124	8.84	6–12
1973	26/4	SW	70	86	97.7	46.4	88.26	76–103	8.84	6–11
1976	19/4	FAX	55	88	77.5	55.1	88.27	61–121	7.26	4–13
1976	10/4	SW	45	90	100.0	30.0	88.77	47–130	6.93	3–11
1979	26/4	FAX	50	85	97.6	34.9	85.39	69–115	6.98	6–10
1985	18/4	SW	37–74*	93	100.0	54.8	96.53	70–129	8.84	5–18
1996	16/4–19/4	BRE	63	87	82.2	50.0	86.28	57–128	7.26	4–11
1996	25/3–9/4	FAX	55	98	68.4	56.7	97.24	79–130	7.36	5–14
1996	27/3	SW	56	85	100.0	43.0	101.20	82–128	7.55	5–13
2000	6/4–8/4	BRE	150	68	97.1	45.5	77.50	50–104	6.75	5–11
2002	5/4	SW	54	74	98.5	40.5	85.54	53–117	6.18	3–12
				1471	87.4	47.4

Note: Exact coordinates and mean depth of subareas are as follows: subarea South West (SW): 63.5–64°N, 20–21°W; subarea Faxaflói bay (FAX): 64–64.5°N, 22–23°W; subarea West Coast Bay, Breiðafjörður (BRE): 65–65.5°N, 23–24°W.