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The aim of the present study was to investigate degradation of three commercial high energy extruded salmonid feeds, differing in physical quality, during pneumatic conveying in a feeding device at different airspeeds (25, 30 and 35ms⁻¹) and feeding rates (9, 18 and 36kgmin⁻¹). The physical quality of the feeds, with a diameter of 12mm, was measured as existing quality, DORIS value, hardness and durability index. Significant differences in the formation of small particles among the feeds were observed during pneumatic conveying. Increasing air speed (ms⁻¹) increased the formation of fractures (particle size 2.4–10mm) and fines (particle size<2.4mm). Increasing the feeding rate (kgmin⁻¹) had the opposite effect, causing a reduction in formation of fracture and fines. Despite the significant differences in physical quality among the diets, no good correlations were found between physical quality parameters and …