The fish-feeder is tossing grain pellets into one of Chen Haiping's nine fish ponds, each as long as a football field, in the town of Shuixi, in China's Guangdong province.

Salmonfarming relies on the release of fish food and nutrients into the water, which always results inwasted feed and a huge amount of fish droppings in the water.

The results indicated that phosphorus supplemented in the fishmeal-free diet could keep the growth, feed utilization and the contents of nutritional composition of body edible part.