Crab shell can be used to extract chitin, an industrial raw material, and also can be used to extract glucose. Some crabs can be used as Chinese medicine. Crab larvae or adults can be used as bait and feed. In addition, some crabs will destroy farmland water conservancy or serve as intermediate hosts of human parasites.

People throw crabs, conchs and other seafood into the garbage after eating them. However, Yan Zhongchang, a 67-year-old citizen of Huludao, has become a treasure. Through his skillful hands, it has become an exquisite handicraft for waste utilization, and his "shell painting" has also become a must.

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Crab culture management, river crabs like to eat fresh ingredients. Therefore, the daily feeding management department should prohibit the long-term storage and deterioration of feed. At present, it is still necessary to give priority to meat, use some nutritious vegetarian food, especially eat more plant feed to ensure good water quality in the pond. The number of times the material is used should depend on the change of climate and temperature.

In hot summer, feed 1-2 times. The exact number depends on the weight of crabs. If there is any untreated residue, it should be rescued immediately to avoid deterioration and affect the water quality.

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Bohai Morning Post-Finished crabs and conchs turn into exquisite handicrafts