Abstract
The study evaluated the growth performance, survival and body composition of Oreochromis niloticus fed isonitrogenous (25%) and isocaloric (186 cal/kg) diets containing different types of oils (fish oil (FO) and vegetable oils (VO) (Soybean oil (SO) and Peanut oil (PO)) at 6% level for a period of 42 days. Significant difference was observed in the body weight gain (WG), specific growth rate (SGR), feed conversion ratio (FCR) values, body protein and lipid content. The diet E containing a mixture of vegetable oils in equal proportions (1:1) produced the best results WG (413.25%), SGR (3.86) and FCR (1.37), whereas the diet B (75% FO + 25% VO) showed the poorest performance WG, FCR and SGR. The survival rate ranged from 55 to 100%, being 55% for C (50% FO+ 50%VO), 65% for A (100% FO) and 100% for B (75% FO+ 25%VO), D (25% FO+ 75%VO) and E (100%VO). The type of dietary lipid significantly affected the body composition of fish. Fish fed on diets B (75% FO+ 25%VO), C (50% FO+ 50%VO), E (100%VO) presented the highest body protein content compared to initial fish. The highest body protein content was obtained in the fish fed on diet B (75% FO+ 25%VO). There was no significant difference in the body protein content of fish fed on diet C (50% FO+ 50%VO) and E (100%VO) also between the initial fish and those fed on diet D (25% FO + 75% VO). The lowest body protein content was obtained with fish fed diet with A (100% FO). Tilapia fed diet containing 100% FO, had the highest body lipid content compared to the initial fish. The lowest body lipid contain was observed in the fish fed on B (75% FO+ 25%VO). There was no significant difference in body lipid and protein content among fish fed diet with D (25% FO+ 75%VO) and initial fish. Results of the present study suggest that diet supplemented with a mixture of vegetable oils (SO and PO) could totally replace fish oil and produce the best growth response in Oreochromis niloticus.
Highlights
Fishmeal and oils derived from wild harvested whole fish currently constitute the major aquatic2013, Vol 4, No 2 protein and lipid sources available within the animal feed marketplace
Data related to the growth performance of Orechromis niloticus fed on different types of dietary lipids are presented in the Table 3
The highest growth performance (P
Summary
Fishmeal and oils derived from wild harvested whole fish currently constitute the major aquatic2013, Vol 4, No 2 protein and lipid sources available within the animal feed marketplace. Due to the expansion of aquaculture, it is expected that the total use of fishmeal and oils by the aquaculture sector will decrease in the long term. Alternatives to the use of marine materials in fish feeds must be found. Changes in aqua-feed have been characterized by an increase in dietary lipid levels to reduce nitrogen wastes and improve growth performance. This evolution combined with the strong increase in aquaculture production has led to a rise in demand for fish oils, while their availability remains limited. Alternative lipid sources to fish oil are used in greater amounts. Key alternatives include vegetable oils reducing the part of marine resources in aqua-feed
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call