A catty of lobsters is 40-45 cm shrimp, which is a crustacean decapod. Seven pounds of lobster is about 60cm in size, but only Boston lobster and Australian lobster can grow this big.

Shrimp is distributed in China waters, rivers and lakes. Its abdomen flexes and stretches nimbly, and its tail paddles downwards and forwards, and it can jump backwards continuously at a very fast speed.