Watermelon is an excellent food for summer heat and heat. People often discard watermelon rind after eating red watermelon. In fact, watermelon rind is rich in nutrition. After simple processing, not only for human consumption, but also for fish feed. In the watermelon rind, it contains nutrients such as sugar, crude protein, refined fat, crude cellulose and chlorophyll. Also combined with carotene, thiamine, niacin, ascorbic acid and calcium, phosphorus, iron and other mineral salts. Feeding fish with watermelon rind, good palatability, fish love to eat, easy to digest and absorb, is conducive to the healthy growth of fish, with watermelon rind feeding fish, can be used to feed the fish fresh and grind powder dry feeding two methods. 1. Beat fresh feed: Wash the collected fresh watermelon rind and beat it with a beater. Then, the whole pool in this fish pond should be splashed and used to feed eel, squid, grass carp, squid, etc., and a 1200 to 1500 kg of watermelon rind is sprayed every day on the surface of the fish pond. After these watermelon rinds are poured into the fish pond water, they can be fed directly to the fish and can also be turned into plankton nutrition in the water under the action of bacteria, and promote the proliferation of planktonic anger in the fish ponds, thereby feeding the feed and The dual role of fertilizing water quality. 2, crushed dry feed: Wash the watermelon rind, first planed into thin slices with a planer, and then dried, then crushed into a powder, into the fish pond feeding fish. When fed, combined with other fish feeds, 30-40 kg of watermelon rind powder per hectare of fish ponds can be fed three times per day. Use watermelon rind or watermelon rind to feed fish, both variable waste is treasure. Expanding the source of feed can also reduce production costs and reduce environmental pollution.