Hi Anisulowo
You know its wrong to feed the public with wrong information especially when it comes to health issues, speculations are not right, I expect to see more facts about the experiments that were performed and survey data, all those were not included, meanwhile apart from the fact that my favorite fish is the cat fish, I checked online for poly unsaturated fat which you expressly said is bad but then American heart association said its good. please read below :

What are polyunsaturated fats?
From a chemical standpoint, polyunsaturated fats are simply fat molecules that have more than one unsaturated carbon bond in the molecule, this is also called a double bond. Oils that contain polyunsaturated fats are typically liquid at room temperature but start to turn solid when chilled. Olive oil is an example of a type of oil that contains polyunsaturated fats.

How do polyunsaturated fats affect my health?
Polyunsaturated fats can help reduce bad cholesterol levels in your blood which can lower your risk of heart disease and stroke. They also provide nutrients to help develop and maintain your body’s cells. Oils rich in polyunsaturated fats also contribute vitamin E to the diet, an antioxidant vitamin most Americans need more of.

Oils rich in polyunsaturated fats also provide essential fats that your body needs but can’t produce itself – such as omega-6 and omega-3 fatty acids. You must get essential fats through food. Omega-6 and omega-3 fatty acids are important for many functions in the body.

Are polyunsaturated fats better for me than saturated fats or trans fats?
Yes. While, all fats provide 9 calories per gram, monounsaturated fats and polyunsaturated fats can have a positive effect on your health, when eaten in moderation. The bad fats – saturated fats and trans fats – can negatively affect your health.

Source : https://www.heart.org/HEARTORG/GettingHealthy/NutritionCenter/HealthyEating/Polyunsaturated-Fats_UCM_301461_Article.jsp#.Vnjcy_mrSUk