author(s)
Snigdha Bakshi, S Behera, Shibam Saha, Abhrajyoti Mandal, Anish Das, Dibakar Bhakta, Anandamoy Mondal and Priyanka Patra

abstract
In the present study juveniles of Trichogaster lalius were exposed to different concentration of spirulina powder incorporated diets to observe the impact in fin pigmentation of the respective species in captive condition. Three different concentration feed were prepared by incorporating spirulina powder at the rate of 2, 4 and 6 g kg-1 and designated as A-2, A-4 and A-6 with one kept as control. Eight set of glass aquarium of 50l capacity (30 × 30 × 30 cm) were used for 4 set of experiment with their respective replicates. The impact of spirulina treated feed on fin pigmentation was analyzed for a period of 60 days. The variation in carotenoid level of fin was observed at wavelength of 450, 475 and 500 nm. Maximum carotenoid accumulation was observed in fin of those specimens fed with 6g kg-1spirulina powder incorporated diet for 450, 475 as well as 500 nm wavelength respectively. There was significant increased (p<0.05) in carotenoid concentration in all three treatments at different wavelengths compared to control. The present findings established that 6 gkg-1spirulina powder incorporated feed has very good potential to enhance the pigmentation of fin in the fish species, Trichogaster lalius.