In Taiwan it is customary to use powdered feed, but Song Cheng uses floating feed. The advantage is that you can scoop what's left over from the surface, whereas the powdered feed sinks in and pollutes the water quality. Also, it's easier to determine the precise amounts for feeding the next day.
舉例而言，鰻魚吃的飼料，台灣習慣用粉料，松城養殖場則改用浮料，好處是吃剩的殘餌會浮在水面可以撈起，不像粉料沈入水底，會污染水質；此外，還可以依殘餌多寡，決定第二天餵食的份量。