A preliminary study to evaluate the impact of supplementary feeds on the fatty acid profile of two size groups of indian major carps in semi-intensive culture system

Two different size groups (fingerling and grow-out) of indian major carps (catla catla,cirrhinus mrigala and labeo rohita) were evaluated for their fatty acid composition in monoculture and poly culture systems with two experimental feeds. all the treatment groups in each trial had one control and three replicates. the studies were conducted for 90 days in earthen ponds (0.03 ha) each and were fertilized with organic and inorganic fertilizers prior to stocking. diets containing 42% protein (dl) and 35% protein (d2) were applied at 4% to fingerlings (dl) and 3% to grow-out fish (d2). the concentration of palmitic acid (c16:0) (30.5 g 100g-1),stearic acid (c18:0) (6.1 g100g-1),palmitoleic acid (c16:l) (8.1g 100g-1),oleic acid (c18:l) (25.5 g 100g-1),and α- linolenic acid (c18:3 n -3) (4.6 g 100g-1) fatty acids,were found as dominant fatty acids in studied three species. in all three study trials non-significant differences were found between treated and control groups and among species for these fatty acids. the linoleic acid (c18:2 n-6) (8.7 g 100 g-1),was found significantly higher in treated (dl) than control (do),while ratio of n-3/ n-6 fatty acids were significantly higher in control (do) versus treated (dl). it has been concluded that diet (dl) exhibited significant increase in c18:2 n-6 and eicosatrienoic acid (c20:3 n-6) which stimulated significant increase in σn-6pufa in all the treated groups compared to controls. © 2015 university of agriculture. all rights reserved.