目前我国养鱼网箱,多数是由粗细不同的聚乙烯网线编织组装而成的。这种材料重量轻,表面光滑,且具有一定的柔挺性,制成网箱后滤水性能好,有利于箱内外水体交换和鱼类生长。但这种材料最大的缺点是耐热性较差。所以,网箱长期设置在水体中,其盖网和箱体上部,在水体透明度所涉及的范围内,由于日光中紫外线的长期照射,网衣强度就明显下降。另 At present, China’s fish cage, most of the different thickness of polyethylene wire braided assembled. This material is light weight, smooth surface, and has a certain degree of flexibility, made of cages after the drainage performance is good, is conducive to the exchange of water inside and outside the box and fish growth. However, the biggest drawback of this material is poor heat resistance. Therefore, the cage set in the water for a long time, the cover network and the upper part of the tank, within the scope of transparency of the water, due to the long-term exposure to ultraviolet light in the sun, the net strength significantly decreased. another