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以珠江口牛头岛深湾作为周年逐月监测点，采用点面结合的方法，同时对大亚湾和珠江口几个开发网箱养鱼多年的海湾作季度调查。通过渔场水质、沉积物的环境要素监测，发现海湾网箱渔场使用多年以后由于有机污染严重，沉积硫化物含量比湾外自然沉积高１０多倍，在夏季小潮期，深湾下层水体溶氧量平均值仅为３．５８ｍｇ／Ｌ，最低值为１．３６ｍｇ／Ｌ。认为沉积硫化物高和下层水体溶氧低是渔场老化的特征。
Taking Pearl Bay Estuary Deep Bay as an annual monitoring point, the method of point-surface combination was adopted. Meanwhile, several seashores for fish cage culture in Daya Bay and Pearl River estuary for many years were surveyed quarterly. Through the monitoring of the environmental quality of the fishery water and sediments, it was found that due to serious organic pollution, the sediment sulfide content was more than 10 times higher than the natural sediment outside the bay after many years of use. In the summer tide, the dissolved oxygen content The average value is only 3.58mg / L, the lowest value is 1.36mg / L. It is considered that the high depositional sulfides and the low dissolved oxygen in lower water bodies are the characteristics of fishery aging.