Hill & Smith analysis of rate of change in catches and environmental variables. (A) projection of the seven variables onto the first factorial plane of the Hill & Smith analysis (axis1 horizontal and axis 2 vertical) with SON-trend, JJA-trend and MAM-trend being for autumn (September-November), summer (July-August) and spring (March-April) air temperature trends respectively. (B–C) projection of the lakes onto the first factorial plane of the Hill & Smith analysis and barycenter of the group of lakes showing significant and non-significant increase or decrease (Increase, IncreaseNs, Decrease, DecreaseNs respectively) in their catches.