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Turkish Journal of Fisheries and Aquatic Sciences 2012, Vol 12, Num, 2     (Pages: 323-329)

The Effects of Dietary Turnip (Brassica rapa) and Biofuel Algae on Growth and Chemical Composition in Rainbow Trout (Oncorhynchus mykiss) Juveniles

Halil İbrahim Haliloğlu 1 ,Murat Arslan 1-2 ,Bong-Joo Lee 3 ,Konrad Dabrowski 3

1 Department of Aquaculture, College of Fisheries, Ataturk University, Erzurum, Turkey
2 Department of Fisheries and Aquaculture, Ispir Hamza Polat Vocational School, Ataturk University, Ispir, Erzurum, Turkey
3 School of Environment and Natural Resources, The Ohio State University, Columbus, Ohio, USA
DOI : 10.4194/1303-2712-v12_2_18 Viewed : 4175 - Downloaded : 3850 The present study was conducted to investigate the supplemental effects of the turnip (Brassica rapa) and its extracts and algae powder on growth performance and body composition of rainbow trout juveniles (0.67±0.01 g). For this purpose, 7 casein-gelatin based semi purified diets were formulated to be isonitrogenous and isocaloric to contain turnip meal, its extracts (with water and methanol) and the powder of after extraction as well as algae powder. The diets were supplemented with 15% wheat flour (diet 1, control), 15% turnip meal of Turkish origin (diet 2), water extract from U.S. turnip (diet 3), methanol extract from Turkish turnip (diet 4), powder of Turkish turnip after extraction (diet 5), 15% turnip meal of U.S. origin (diet 6) and 15% biofuel algae powder (diet 7). After 4 week feeding trial, the fish fed diet 7 had significantly lower growth than those fed the other 6 experimental diets (P<0.05). Among the fish fed dietary turnip or its extracts, there was no significant difference in growth and survival (P>0.05). However, turnip supplementation tended to increase growth in comparison to control diet. Food conversion ratio (FCR) and protein efficiency ratio (PER) were significantly higher in fish fed diets with turnip and its extract than those fed the biofuel algae and control diets. Our study indicated that turnip seems to have a growth enhancing effects in juvenile rainbow trout. This positive effect might be connected with some phytochemicals, which is reported as antioxidant and health promoting properties of turnip. Further studies are needed to disclose the effect of dietary turnip on rainbow trout. Keywords : Turnip (Brassica rapa), feed, growth, rainbow trout