Sarathchandra, M.A.D.P.I.Mahaliyana, A.S.Coswatte, A.C.W.W.M.C.L.K.Jayamanne, S.C.2019-07-042019-07-0420189789550481194http://erepo.lib.uwu.ac.lk/bitstream/handle/123456789/1393/66-2018-Effect%20of%20Raw%20Spirulina%20platensis%20Supplement%20on%20the%20Growth%20.pdf?sequence=1&isAllowed=yAquarium fish industry in Sri Lanka has become a valuable source of foreign exchange recently. Guppy fish (Poecilia reticulata) ranks the highest (67%) market of ornamental, fresh water fish export sector in Sri Lanka. Spirulina platensis is one of the commercially important micro algae due to its overall nutritional qualities. The study was investigated the effect of dietary supplementation of different percentages of Spirulina platensis (5%, 10%, 15%, 20%, and 25%) on growth performance, Feed Conversion Rate and survival rate in guppy and were compared with commercial feed as the control treatment. Spirulina platensis were cultured using axenic batch culture method in Zarrouck's medium, under illumination with a photo period of 12 hours light and dark. Glass tanks (0.3 m x 0.15 m x 0.15 in) were used for each treatment with 3 replicates and 21 days old red blond guppy were reared with a stocking density of 10 fish/tank for 30 days. Fish were fed, twice per day at a rate of 10% of body weight for 60 days. Data were collected every 2 weeks interval and analyzed by One Way Analysis Variance (ANOVA). There were significant differences between all the diets in terms of average body weights (p<0.05). Average body weight was highest in treatment with 5% raw Spiruina platensis incorporated feed (0.45±0.090 and lowest in control treatment (0.36±0.13g). No significant differences were observed in weight gain and Specific Growth Rate (SGR) (p>0.05) according to the treatments. There were significant differences of Feed Conversion Ratio (FCR) among all the diets (p<0.05), while it was lowest in 5% raw Spirulina platensis incorporated feed (1.43±0.06) and highest in the control treatment (2.05+0.09). 100% survival rate was observed in all treatments. The study revealed that 5% raw Spirulina platensis dietary supplementation enhances the growth rate in guppy fish.enAgricultureAquaculture and FisheriesOther