COLOUR ENHANCEMENT OF SWORD TAIL [XIPHOPHORUS HELLERI (HECKEL, 1848)] BY USING FEED FORMULATED WITH SELECTED ORNAMENTAL FLOWERS
Golandaj A.1, Swain S.1 and Mogalekar H. S.2
1School of Aquaculture and Biotechnology, Faculty of Fisheries, Kerala University of Fisheries and Ocean Studies,
Panangad, Kochi – 682506, Kerala, India.
2Department of Fisheries Biology and Resource Management, Fisheries College & Research Institute, Tamil Nadu Fisheries
University, Thoothukudi-628 008, Tamil Nadu, India.
[Corresponding author E-mail2: firstname.lastname@example.org]
Received: 19-08-2015 Accepted: 19-10-2015
The present study (90 days) was conducted to evaluate the colour enhancement of Xiphophorus helleri by using feed formulated with selected ornamental flowers. Completely randomized design was employed for the study. Dried petal meal of the three chosen ornamental sources was incorporated in the test diets at 5% each. The test diets were designated as T1, T2 and T3 respectively. A basal feed without carotenoid served as the control (T0). Ten larvae of sword tail were stocked in each tank. Each diet was fed to fish in a set of three tanks each. Growth response as well as water quality parameters were monitored at fortnightly intervals. The growth response was the highest in marigold supplemented diets followed by ixora and hibiscus supplemented diets. The colour enhancement was assessed by colorimetry as well as by employing computer assisted approach, employing Adobe Photoshop®Version 7. On termination of the study, the growth data was statistically analysed using two way analysis of variance. Fish fed all the three test diets showed significantly different growth response from the control fish. Significant enhancement in colour development was observed in fish fed all three test diets. The intensity of colour development was highest in T1 treatment followed by T2 and T3. Fish fed the control diet showed the least colour intensity. The three flower meals assessed are cheap, easily available and involve only marginal additional cost. This approach is easily adoptable at the farmer level and moreover, does not involve any adverse effects. Further studies are required on the optimum level of inclusion of the carotenoid sources in the diets.
Keywords: Sword Tail, ornamental flowers, larvae, colorimetry, carotenoid, diet