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本试验采取封闭式健康养殖模式，取得了较好的养殖效果和经济效益，现将试验情况总结如下： 一、材料与方法 试验在富阳华丰水产养殖场进行，所用免疫增强剂均为河北大学研制。 1.池塘条件：面积 1亩池塘一只，底质为砂壤质，东西向，长宽比为 3∶ 1，坡比为 1∶ 2
This experiment adopts a closed healthy breeding mode and achieved good breeding effect and economic benefit. The test conditions are summarized as follows: First, the materials and methods were tested in Fuyang Huafeng Aquaculture Farm, and all the immune boosters used were Hebei University Development. 1 pond conditions: an area of 1 mu pond, the sediment sandy loam, east-west, aspect ratio of 3: 1, slope ratio of 1: 2