Which is not a fish, goldfish, grass carp or dollfish?

The dollfish is not.

The dollfish, also known as the giant salamander, breathes with gills in its hatchlings and lungs in its adults.The dollfish inhabits streams in mountainous areas and is an amphibian.

Fish are characterized by living in the water, most of the fish's body surface is covered with scales to reduce water resistance, breathing with gills, swimming with fins, and constantly swimming forward by the side-to-side swing of the tail and trunk and the coordinated action of the fins.

Fish live in the water, breathe with gills and swim with fins. Goldfish and grass carp have the characteristics of fish and belong to the category of fish.

Food

Giant salamanders do not have good eyesight and perceive external information mainly through smell and touch. They can also sense vibrations in the water through the warts on their skin, which in turn catch fish and shrimp as well as insects in the water.

The Chinese giant salamander occupies a position at the top of the food chain in the ecosystem in which it lives, and is an important link in the biological chain. Chinese giant salamanders have slightly different food sources in different waters. They are large eaters, mainly preying on fish, crustaceans, amphibians, and small arthropods in the water, and a small amount of plant matter is also found in their stomachs.

Living in the Yangtze River Basin, the giant salamander's habitat is home to fish such as white snappers, wide-mouthed light-lipped fish, and horse mouthed fish, which provide a wide range of prey for the salamander.