Fish Feed Used In Aquaculture

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GROWTH PERFORMANCE, FEED UTILIZATION, BODY AND FATTY ACID COMPOSITION OF NILE TILAPIA (OREOCHROMIS NILOTICUS) FED ELEVATED LEVELS OF COCONUT OIL 2.1 INTRODUCTION Aquaculture has been deemed one of the prominent and fastest growing sectors in the food industry globally. The increase in demand by consumers for aquatic products solely does not depend on satisfying their hunger but with varying reasons such as balanced diet and health reasons (FAO, 2012). This has resulted in higher demand for improved forms of fishmeal and oil; the major components of fish feed used in aquaculture (Dernekbaşi & Karayücel, 2010). Although there are various sources of oils, marine fish oil has been the most commonly used dietary lipid in fish diet which has now…show more content…
It has the ability to withstand environmental stress, reproduce easily and grow at a faster rate with high market value as well (El-Sayeed, 2006). Their ability to feed on varieties of food ranging from zooplankton to fish food (Olaosebikan & Raji, 1998), lead to efficient utilization of vegetable oil (Sala & Balesteros, 1997). O. niloticus has been cultured successfully on series of alternative lipids and blends with FO at various levels, including soybean oil, crude palm oil, crude palm kernel, sunflower oil, palm fatty acid distillates, linseed and many others (Gabber, 1996; Ng et al., 2001; Kaushik, 2004; Ng, 2004; Ng et al., 2004). The choice of lipid for feed formulation have also been influenced by other factors such as diseases and resistance (health) of the fish and for consumer health (Ballestrazzi et al., 2006; Ng et al., 2009). However, numerous novels on lipid have become widely available both in mammals and some fish species on disease and resistance (Azad et al., 2001; Al-harbi & Uddin, 2004; Cai et al., 2004) on effects of vegetable oils on plasma metabolites and hematocrits; few have been evaluated in the context of coconut oil replacement of FO in O. niloticus diet (Nordrum et al., 2003; Mohamed et al., 2002; Nagao & Yanagita, 2010; Williams et al., 2006; Allan et al., 2001) and has shown the association between growth performance, body composition…show more content…
Extruded pellets were obtained through an extrusion mill (SLP-45, Chinese Fishery Machinery and Instrument Research Institute of the Chinese Academy of Fishery Sciences, Shanghai, China) and air-dried at room temperature to moisture content 13%. Pellets were then sieved to obtain appropriate sizes and stored frozen in air-tight plastic bags at -20°C for subsequent use. Triplicates diet samples were analyzed to confirm the proximate composition according to standard methods of determination of dry matter, protein and ash content of animal feeds (AOAC, 2003). Lipid content was determined following the method of Folch et al., (1957) and were analyzed for fatty acid

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