As shown in the picture, fish from the stingray (hóng) family? Scientific name
Wandering family Dasyatidae, genus of stingrays DasyatisCartilaginous fishes(I don't know which one in particular)
The image below shows the short-tailed skate Dasyatis brevicaudata
It inhabits sandy ocean floors, seagrass beds, lagoons and reefs, and is common in bays and estuaries . They usually live alone, but form groups when mating, resting, and hiding from predators. They are benthic creatures, hiding in the sand during the day and foraging for food at night, usually in seagrass beds. They use vents at the top to clear the sand layer and dig into the sand to search for invertebrates and small fish. It feeds mainly on bivalves and worms, but also on crevettes, crabs and small fish. It moves in the water by flapping its pectoral fins. This method of movement is very maneuverable and helps it find food and escape its natural enemies.