Figure 26: Depth distribution of catch per unit effort (CPUE; horizontal axis) for native fish species living in the deeper zones of the deep, northern perialpine lakes: Coregonus spp (yellow), Salvelinus spp (red), Cottus spp (grey/brown) and Lota lota (light grey). CPUE is the average of catches in deep-set vertical nets and benthic CEN nets. CPUE is square-root transformed to increase the visibility of the smaller values in the profundal zone. Note that the scale of the horizontal axis (CPUE) differs among the lakes. Whereas Lota lota has pelagic eggs and larvae and does hence not have to recruit locally, all other species recruit locally. Boxes at the bottom of the figure show the total phosphorus of the lake at the time of Projet Lac sampling (upper value) and the maximum measured total phosphorus value that had been experienced by the lake in the past (lower value in bold). The panels for Constance and Zurich show the data for the deeper lake in each of the pairs (i.e. Upper Constance and Lower Zurich).

Published as part of Alexander, Timothy & Seehausen, Ole, 2021, Diversity, distribution and community composition of fish in perialpine lakes ��� "Projet Lac" synthesis report in null, Eawag: Swiss Federal Institute of Aquatic Science and Technology on page 78, DOI: 10.5281/zenodo.5779569