The rapid development of coastal cities has brought with it the problem of wastewater discharge. In addition, in the past, not all the feed put in by fish farmers was absorbed by the fish. The remaining feed and fish excrement accumulated in the breeding area, resulting in a vicious cycle, leading to overnutrition and occasional red tides. Once the red tide comes, the lack of oxygen causes the fish to die, and the fish farmers lose all their money. In addition, the severe cold in winter and the wind disasters in summer will also cause losses to fish farmers. Faced with the increasing risks, many fish farmers have to give up fish farming, and their livelihoods are at risk.
However, pearl oysters are more adaptable to the environment than fish. Even if red tides come and fish die of lack of oxygen, pearl oysters will not die with them. When typhoons destroy fish cages and nets, fish get lost or injured, but pearl oysters only suffer minor losses. Severe cold weather can cause fish to stop eating or even freeze to death, but pearl oysters can survive the cold winter under their hibernation mechanism. Therefore, pearl farming can share the risks of aquaculture and become a guarantee for fishermen.
It only needs to remove foreign organisms from the shells regularly, and no feeding is required, so the additional cost is low. Pearl oysters can also filter seawater, prey on plankton in the water, and absorb nutrients from the aquaculture area, thereby reducing the chance of red tides forming, which can improve the livelihoods of fishermen in the long run. 
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