red spot disease of eel

例句：

1. 1. The eel was found with a red spot on its body.
   这条鳗鱼身上有一块红斑点。
2. 2.The red spot disease is a major threat to the fish industry.
   赤斑病对渔业构成了重大威胁。
3. 3. The eel's red spot disease is caused by a parasite.
   鳗鱼的赤斑病是由寄生虫引起的。