What is a fatty fish?
A fatty fish is a type of fish that has a high fat content, typically more than 5% fat. source

What are types of fatty fish? 
mackerel (1)
salmon (1)
tuna (2)
sardines (2)

What does fatty fish contain? 
omega-3 fatty acids 
vitamin D

Resources
1. https://www.healthline.com/nutrition/12-omega-3-rich-foods
2. https://www.healthline.com/health/skin/uva-vs-uvb#vitamin-d

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