Cholesterol is a waxy, fat-like substance found in the human body's cells. It is used to process vitamin D, break down the food and produce hormones. There is LDL cholesterol, often called bad cholesterol, and HDL or good cholesterol. Unhealthy eating habits and lifestyle are often cited as the two main reasons for high cholesterol levels.
High cholesterol could lead to high blood pressure and increase the risk of heart attack and stroke. Regular workouts and a balanced diet could help you reduce cholesterol healthily and naturally. Including these fish regularly in the diet can effectively reduce cholesterol levels.

Tuna
Tuna is a storehouse of omega-3 fatty acids that can reduce the LDL level.
River fish
River or freshwater fish, too, is a great source of omega-3 fatty acids that maintain HDL or good cholesterol.
Mackerel
The omega-3 fatty acids in mackerel can control cholesterol levels.

Herring
Herring is a forage fish that looks like a sardine. It contains EPA and DHA, two fatty acids that can reduce inflammation and improve heart health. Besides, herrings are rich in vitamin D.
Sardine
Sardines contain omega-3 fatty acids that reduce cholesterol. Besides, it also contains minerals like phosphorous, calcium and potassium. Moreover, sardines can also minutely lower the blood sugar level.
Walleye
Walleye or wallfish contains omega-3 fatty acids that regulate cholesterol and blood pressure.

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