Why is there such a strong smell from fish?

Question: Why is there such a strong smell from fish?
- Keywords:
  fish,
  smell
Asked by 595fddk47 to Ciara on 14 Nov 2017.
- Ciara O'Donovan answered on 14 Nov 2017:
  
  This is due to a chemical called triethylamine oxide which when exposed to air breaks down and causes this fishy smell.

Question: Why is there such a strong smell from fish?