一、对池塘的环境要做认真的调查、分析和比较１．选址选址要求四周无高大的树木、建筑物等，水源充足无污染，水质良好，pH适中，能满足生产用水需要。另外交通便利，使苗种、肥料、饲料及商品鱼的来往运输方便，降低养鱼成本。２．土质土质要求具有良好的保水性，具有一定的 First, the pond environment to do a serious investigation, analysis and comparison 1. Site selection requires four weeks without tall trees, buildings, etc., adequate water pollution, good water quality, moderate pH, to meet the production needs of water. In addition, convenient transportation, so that the seedlings, fertilizers, fodder and commercial fish transport convenience, reduce fish costs. 2. Soil quality requirements have good water retention, with a certain