Relationships (Spearman correlation) between the rate of changes in catches and air temperature measured over geographical area of the lakes for different seasons (Winter: December of the previous year to February; Spring: March to May; Summer: June to August; Autumn: September to November). The color of the circles indicates the level of significance of long-term trends in catches computed over the period 2000–2019 (p-value<0.05: dark blue; no significant: light blue).