When buying fish, there are certain aspects to pay attention to. It is important to examine the gills of the fish.

Fresh fish should smell like the sea and seaweed, and its eyes should be bulging and transparent.

If the fish's eyes are sunken and cloudy, it indicates that the fish is old. When pressing the fish with your finger, it should not leave any indentations. Additionally, when fresh fish is submerged in water, it sinks, while old fish floats to the surface. Fish with an open mouth and a bloated belly are also considered old.

If the flesh of the fish crumbles when removing the scales, it indicates that the fish is old. Even if you encounter such fish during the months that contain the letter "R" in their names, it can still cause food poisoning.