Changes in age and maturity of anadromous whitefish (Coregonus lavaretus) in the northern Baltic Sea from 1998 to 2014

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Table 3

Spearman correlation coefficient (r) between the mean age of anadromous Coregonus lavaretus year class and the annual sea surface temperature (SST) or between the seasonal (June–August) NAO index in the northern and southern Gulf of Bothnia.

Area	Sex	Correlation between mean age and SST at Valassaaret			Correlation between mean age and NAO index

		r	P	n	r	P	n
North	Male	−0.662	0.005	16	0.507	0.037	17
North	Female	−0.688	0.003	16	0.613	0.008	17
South	Male	−0.538	0.058	13	0.395	0.116	17
South	Female	−0.723	0.004	14	0.574	0.016	17

Number of years = n. Significance = P. The SST in June was measured in the third sea year of the year class and the NAO in June to August was measured in the second sea year of the year class.

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