In addition to squid and octopus, there are Ankang fish, yellow croaker, grouper, flounder, eel cuttlefish, octopus, Longli fish and so on. Common freshwater ornamental fish include rainbow dragonfly, red arowana, neon swallow, Peru, crystal bottle fish, blue zebra fish, Thai betta fish, jade bream, pearl oyster fish, parrot fish, goldfish, traffic light fish, parent fish and peacock fish.

At present, there are about 8,000 species of freshwater fish, among which there are more than 1000 species in China. The so-called freshwater fish refers to fish that live in fresh water with salinity of three thousandths. Freshwater fish generally have special colors and stripes to help hide themselves.

Marine fish refers to fish that live in the ocean. These marine fish will die if they enter fresh water. In contrast, the nutritional value of marine fish is much higher than that of freshwater fish.

Marine fish contains a lot of minerals, vitamins, protein and other nutrients, especially the cod liver oil of marine fish contains highly unsaturated fatty acids, which has a good protective effect on the brain and heart and can improve our memory.