polyculture density混养密度
shrimp polyculture对虾综合养殖
Fish polyculture鱼类混养
Closed polyculture封闭式混养
intensive polyculture集约化混养
bacteria polyculture菌种混养
pond polyculture池塘混养
technique of polyculture混养技术
Fish-clam polyculture鱼蚌套养