Andrzej DOWGIAŁŁO
Sea Fisheries Institute, Kołłątaja 1, 81-332 Gdynia, Poland

Key words: freshwater fish, mechanization, skinning.

Abstract.
This paper describes experiments which indicated that the unit resistance while skinning fillets of several freshwater fish species and cod do not significantly vary statistically. Further investigations focused on determining resistance, which is significant in mechanical skinning, as it occurred with respect to operation type. These included immobilized, vibrating and linearly cutting skinning knives, and skinning by peeling. The results obtained while skinning bream fillet samples allowed for the preparation of a statistical model which describes the variability of cutting resistance as a function of the parameters of a given skinning tool.