“…The quantitative requirement of choline has been studied in many fish species. The dietary requirement has been reported to be 1000, 1500, 1700-3200, 598-634, 1000, 714-813 and 696-950 mg kg À1 for hybrid tilapia, Oreochromis niloticus 9 O. aureus (Shiau & Lo 2000), common carp, Cyprinus carpio L. (Ogino et al 1970), white sturgeon, Acipenser transmontanus (Hung 1989), yellow perch, Perca flavescens (Twibell & Brown 2000), lake trout, Salvelinus namaycush (Ketola 1976), rainbow trout, Oncorhynchus mykiss (Rumsey 1991) and cobia, Rachycentron canadum (Mai et al 2009), respectively. In the study of juvenile hybrid tilapia, choline deficiency has been showed to decrease fish blood triglyceride, cholesterol, phospholipids and fat concentration in liver (Shiau & Lo 2000).…”