Mean predicted dietary contributions (0–1) of ‘Cyprinidae’, ‘Invertebrates’ and ‘Percidae’ to the diet of S. lucioperca by size class (<350 and >350 mm) for each Bayesian mixing model. Models are represented by colour in sequence from light to dark, where model 1 is represented by light grey and model 5 by dark grey, and error bars represent the standard deviation. Mixing models were (1) consumer as muscle values, (2) consumer as mucus values, (3) consumer as scale values, (4) consumer as muscle values based on conversion using the linear models for δ¹³C and δ¹⁵N mucus to muscle, and (5) consumer as muscle values based on conversion using the linear models for δ¹³C and δ¹⁵N scale to muscle.