What are the natural enemies of crabs?

The natural enemies of crabs are squid, waterfowl, egret and crab-eating fox. They belong to crustaceans. Their bodies are protected by crustaceans and they breathe through their gills. Most crabs live in the sea or offshore areas, and some live in fresh water or land. Most of them grow under the rocks in mountain streams. Common crab species are Portunus, Eriocheir sinensis and so on. The main edible crabs are Portunus trituberculatus, Eriocheir sinensis and Eriocheir sinensis.

Portunus trituberculatus, commonly known as white crab or Portunus trituberculatus, is an important economic crab in fishery and aquaculture in China with rich nutrition and delicious taste. Blue crabs are mainly distributed in Hainan, Guangdong, Guangxi, Zhejiang and other coastal waters, and have a great taste. Eriocheir sinensis, also known as river crab, hairy crab and hairy crab, has the characteristics of green back, golden claws, white belly and yellow hair.