Browsing by Author "ABEYGUNAWARDANA, E.A.W.R."

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    DETERMINATION OF OPTIMAL PROTEIN AND LIPID RATIO FOR GROWTH OF FARMED CATFISH, Pangasius Sutchi
    (Uva Wellassa University of Sri Lanka, 2013) ABEYGUNAWARDANA, E.A.W.R.
    The effect of different protein and lipid levels for growth of farmed catfish, Pangasius sutchi fry were studied for six experimental diets using a 3 x 2 factorial design with triplicates. Groups of 12 fish per tank, with initial mean weights of 1.07 + 0.18 g were fed with six test diets comprising combination of three crude protein levels (25%, 30%, 35%) and two lipid levels (6%, 10%). Feeds were incorporated with an inert marker (Chromic oxide) to measure the digestibility .The fish were fed until satiety twice a day for 7 weeks by manually. Feed Conversion Ratio (FCR), Specific Growth Rate (SGR) and Condition Factor (K) were calculated for each diet. FCR and SGR were significant among the test diets while K was not significantly differ (p>0.05) among the test diets. The highest SGR and lowest FCR was recorded for the diet contain 35% protein and 10% lipid and it was not significant (p>0.05) from the diet that contained protein 35% lipid 6%. The lowest SGR and highest FCR were recorded for the diet contained protein 25% lipid 10% also. The digestibility was also not significantly different among all the test diets. Results of the experiment indicate that the use of combination 35% protein and 6% lipid for the diet of Pangasius sutchi most effective protein and lipid level for the growth performance. Key words — Digestibility, Feed conversion ratio, Specific growth rate, Aquaculture