Analysis of Erli Crab Seedling Breeding Base in Liaoning: 1 1,000 mu Crab Breeding Base requires crab seedling cost 150 yuan/mu, bait 300 yuan/mu, artificial escape prevention equipment, fishing nets, water and electricity, etc. 200 yuan/mu, and the total breeding cost is added with the water contracting fee. Free-range breeding means the cost of crab seedlings plus the cost of artificial water and electricity nets, which is about 200~300 yuan per mu.