Hairuddin, Nur Diyana (2023) Development of formulated fish feed supplemented with microalgae of phycoremediation on the growth performance and fatty acids content of oreochromis niloticus. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

The arising issues on the use of fishmeal which causes over exploitation of the wild caught fish and the increment cost of aquaculture is increasing day by day. This has led to find new alternatives to replace fishmeal such as microalgae. In this study, 2 % of Scenedesmus sp. cultivated in Bold Basal Medium and wet market wastewater was partially subtituted to replace fishmeal and tested to Oreochromis niloticus fingerlings for 12 weeks. The physicochemical properties of pelletized feed was analysed and compared between control formulation, formulation 1 and formulation 2. The results found that, addition of Scenedesmus sp. in the diet would not alter the hardness of the feed, yet the small increment of hardness in the diet formulation 1 and 2 might be due to the failure of maintaining weight of the feed before and after pelletizing process. Besides, the analysis of variance showed that moisture content of formulation 1 and 2 were significantly difference (p<0.05) and the mineral composition of the feed shows an improvement for formulation 2, however, it is still not meet the requirement due to the absence of complete diet ingredients in the formulations. Moreover, the growth performance of Oreochromis niloticus was analysed weekly using analytical balance and the results obtained showed an improvement in the final weight of the fish in formulation 1 and 2 up to 43.38g and 44.85 g respectively. The concentration of fatty acids obtained in this study was acceptable, though, the concentration of omega 6 is higher compared to omega 3. To conclude this finding, the addition of Scenedesmus sp. in the diet formulation for Oreochromis niloticus gives a small difference in physicochemical properties of the feed pellet, yet it facilitates in maintaining and improving the growth and the quality of muscle tissue of Oreochromis niloticus

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