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Table 1

Age distribution (%) and median age (md) with quartiles (q1–q3) and mean age of mature anadromous male (M) and female (F) whitefish (Coregonus lavaretus) in the northern and southern Gulf of Bothnia in 1998–2014.

Area Sample Age (%) Age Age

Sex n 2 3 4 5 6 7 8–12 md (q1–q3) mean (std)
North (M) 3156 0.1 3.9 35.0 32.7 18.1 6.9 3.3 5 (4–6) 5.0 (1.2)
North (F) 1788 0.0 0.8 16.7 37.1 26.1 11.9 7.4 5 (5–6) 5.6 (1.2)
South (M) 3351 0.4 12.9 45.2 32.8 7.3 1.0 0.4 4 (4–5) 4.4 (0.9)
South (F) 2670 0.4 10.5 30.9 37.1 16.2 3.9 1.0 5 (4–5) 4.7 (1.1)

Number of fish = n. The P-value of the goodness-of-fit test (Kolmogorov-Smirnov-test) for normal distribution for each four groups was P < 0.010.

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