1. The production of river crabs is low. River crabs are mainly distributed in specific areas of China, their ecological environment and water quality requirements are high, and their reproduction ability is strong, and the supply of sea crabs is limited. The reproduction ability is not strong.

2. River crabs are superior in taste and quality. The meat of river crabs is delicious, delicate and elastic, and their crab yolks are more plump and delicious. The quality and taste of river crabs are often considered superior to sea crabs, so river crabs are expensive.