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Fish are variable temperature aquatic vertebrates that breathe through gills, swim by swinging their tails and torso, and feed on their upper and lower jaws in coordination with their fins. They belong to the subphylum of vertebrates in the phylum Chordata, and are generally classified as fish（53%）Birds（18%）Crawlers（12%）Mammals（9%）Amphibians（8%）Five major categories. According to the late Canadian scholar Nielsen1994According to annual statistics, there are a total of fish species currently living worldwide24618Species, accounting for more than half of the named vertebrates, and new species of fish are constantly being discovered, with an average of about per year150Seed counting, it should have increased by more than ten years1500Species, the globally named fish species are approximately32100Seed.
Fish are mainly divided into tropical fish, warm tropical fish, and cold tropical fish.
Water fish are divided into freshwater fish and saltwater fish.
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