Figure 9: Length frequency distribution of large perch among lakes. Data from benthic CEN nets to 20 meters deep. The num- ber of fish is adjusted for the corresponding gillnetting effort in the lake. Vertical axis is truncated at 0.5 fish per 100 m2 of net to focus on the occurrence of the larger fish. Arrows indicate the approximate length of fish at which permitted nets for com- mercial fisheries become efficient. There was no commercial fishing in lakes Bret, Bonlieu, Chalain, Saint-Point, Remoray and Rousses at the time of Projet Lac sampling. No minimum size limit for perch in Annecy and Bourget. Lakes Biel and Sarnen are excluded as the different mesh sizes used in the Projet Lac sampling of these lakes influences the fish length frequency distribution, meaning that it is not possible to directly compare them to other lakes.

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 53, DOI: 10.5281/zenodo.5779569