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Turkish Journal of Fisheries and Aquatic Sciences 2014, Vol 14, Num, 4     (Pages: 875-878)

The Effect of Different First Feeds on Proteolytic Activity of the Northern Pike, Esox lucius Linneaus 1758, Post-Larvae

Burak Hazman 1 ,Kaya Gökçek 1

1 Mustafa Kemal University, Marine Sciences and Technology Faculty, Aquaculture Department, Iskenderun, Hatay, Turkey DOI : 10.4194/1303-2712-v14_4_04 Viewed : 1513 - Downloaded : 1069 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 2nd day in Artemia (228.22±15.44 U/mg) and plankton (302.78±45.85 U/mg) groups, and on 3rd 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 8th in Artemia and plankton group, but on the day 9th 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