Choose fresh fish How is science?

I know some songs about fish-picking experience: "to buy fish, you have to watch it . Is there a science to choose? Is there any harm in eating fish?".

Hello,

Nutritionists recommend that we eat a lot of fish because the fish are easy to digest, a lot of nutrients, especially for children, the elderly, pregnant women, people with cardiovascular disease . But the fish must be fresh, no oh well, oh; because rancid fish are not only nutritious but also include toxic substances such as ptomain (decay toxin), histamine (allergen).

The old man's advice on how to choose fish in the verses you mentioned is very scientific. To choose fresh, delicious fish can be based on:

- Fish eyes: Must be convex and transparent, elastic cornea. Fish eyes, rancid, are concave, cloudy, cornea wrinkled or torn.

- Fish: Must dive deep inside, has a white color; belly fish. If the fish is spoiled, the anus is pink or bruised, sticking out, the abdomen is bulging.

- Wear: Must be red pink, stick with star fruit, no viscosity or odor. Bring fish with gray color, not stick with star fruit, viscous, bad smell.

- Scales: Iridescent, sticking with fish body, no mucus or stench. Eel fish is often fuzzy, not iridescent, easy to peel off from the body, with an unpleasant odor.

- Mouth: Fresh fish mouth is closed, and fish are open.

- Meat: In fresh fish, it is firm, elastic, leaving no trace when you press your finger. On the other hand, fish is the opposite.