Because the rays have no bladder, they urinate through the skin, so they are particularly smelly, the meat is not delicious, and there are stingers in their tails, so no one eats rays.

Juvenile rays feed on animals that live on the bottom of the sea, such as crabs and lobsters. When I grow up, I mainly hunt mollusks such as squid. When hunting, rays mainly hunt by smell. Rays try to avoid inhaling sediment by using special closed breathing method when lying on the bottom of the sea. When the rays breathe, the water is inhaled through the pipeline overhead and finally flows out through the cheek crack on the abdomen.

Rays purchase skills:

When buying, you need to pay attention to the shape characteristics of the rays. The rays are round or diamond-shaped, and the pectoral fins are wide, extending from the snout to the slender tail root; Some species have sharp snouts, their bodies are flat and their tails are slender, and some species of rays have one or several stingers with serrated edges on their tails.

And be sure to know that high-quality rays generally have eyes and blowholes on the top of the head, and are formed by coracoid cartilage protruding from the skull. Don't buy those rays with eyes at the bottom of the film, the quality is not good.

Reference to the above content? Baidu encyclopedia-rays