shark skin disease of porphyra filament

例句：

1. 1.The shark skin disease is a serious concern for marine biologists.
   鲨鱼皮肤疾病是海洋生物学家们严重关注的问题。
2. 2. The researchers found that the porphyra filament was the main cause of the disease.
   研究人员发现，珍珠纤维是这种疾病的主要原因。
3. 3.The shark skin disease has been linked to increased levels of mercury in the environment.
   鲨鱼皮肤疾病与环境中汞含量的增加有关。