1. Trout is a common name for a group of fishes of Salmonidae, belonging to freshwater fishes, living in waters with a water depth of 0 to 200 meters.

Abalone is neither a freshwater fish nor a marine fish. Abalone is a very precious seafood, a kind of abalone and snail, and one of the precious "sea treasures". Delicious and nutritious, it is known as the "soft gold" of the ocean.

3, marine fish, fish living in the sea, marine fish will die in fresh water. Seawater has high density and high pressure. After entering fresh water, the pressure of fresh water is low, and the blood pressure of marine fish exceeds the water pressure, resulting in blood vessel rupture and death.