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¹ Mustafa Kemal University, Marine Sciences and Technology Faculty, Aquaculture Department, Iskenderun, Hatay, Turkey DOI : 10.4194/1303-2712-v14_4_04 Viewed : 5317 - Downloaded : 3656 The Northern Pike, Esox lucius, post-larvae were fed with trout micro diet, Artemia nauplii and plankton at the first ten days after yolk - sac absorption and the proteolytic activity of the post-larvae were measured. According to the results, the proteolytic activity was significantly affected by the different type of first feed (P<0.05). The highest protease activities were obtained on 2^nd day in Artemia (228.22±15.44 U/mg) and plankton (302.78±45.85 U/mg) groups, and on 3^rd day in micro diet (202.05±19.79 U/mg) group. After this point, the enzymatic activity started to decrease in all groups. Thereafter, the conspicuous increase in protease activities of larvae was determined on the day 8^th in Artemia and plankton group, but on the day 9^th in micro diet group (P<0.05). In contrast to other feeding groups, it is observed that feeding pike post-larvae with plankton caused more positive effect on proteolytic activity than the other groups. Keywords : Northern pike, ontogeny, post-larvae, first feeding, proteolytic activity