1D SDS-PAGE of protein hydrolysis profiles of hoki roe homogenate. (A) Alcalase, (B) FP-II, and (C) HT, all with the same amount of proteolytic activity (30000 U) and (D) effect of protease concentration (1 %, 2 %, 4 %) on protein hydrolysis of hoki roe homogenate after 3 h incubation under conditions stated in Materials and Methods. Abbreviations: C, hoki roe substrate without protease preparation; AlcC = Alcalase control; FPC = FP-II protease control; HTC = HT protease control.