One hundred to three hundred. The stocking density should not be too high, and the stocking amount of loach fish in a square meter in high density depends on how deep the mud in the pond is. Generally, 100 to 300 loaches are suitable for stocking in a square meter, and 600 to 1000 can be produced in 100 kilograms. How to feed them is the key. Therefore, it is said that there are 100 to 300 loach fish in a square meter in a high-density factory.