Many fish can communicate acoustically with each other, such as during courtship displays. The study of fish is known as ichthyology. There are over 33,000 extant species of fish, which is more than all species of amphibians, reptiles, birds, and mammals combined.

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2025年8月9日 · What is a fish? A fish is any of approximately 34,000 species of vertebrate animals found in the world’s fresh and salt waters. The term fish is applied to a variety of vertebrates of several evolutionary lines. It describes a life-form rather than a taxonomic group.

2023年1月3日 · Instead, there are 3 main classes, groups, or types of fish: bony fish (Osteichthyes), jawless fish (Agnatha), and cartilaginous fish (Chondrichthyes). Fish are the most diverse group among vertebrates, with over 33,000 different types of fish species.

Fish are one of the first vertebrates that came to life on this planet. They hold the basic blueprint for all different types of body structures found on the planet and has evolved into all sorts of unusual species.

All fish share two traits: they live in water and they have a backbone—they are vertebrates. Apart from these similarities, however, many of the species in this group differ markedly from one...

2022年7月28日 · The ultimate guide to fishes & fish life, including definition of a fish, fish bodies, types of fish and the life-cycle of a fish. Read on for a complete guide to ichthyology…

2022年12月27日 · The term “ fish ” refers to a diverse group of aquatic creatures known for living in water environments. Fish are characterized by their gills, which they use for breathing underwater, and typically have a body covered with scales.

2024年5月21日 · Fish are aquatic vertebrates that typically have gills, fins, and a streamlined body. They inhabit diverse environments, from freshwater rivers and lakes to salty oceans and …

Explore facts and photos about fish found in and around the United States. Learn about their range, habitat, diet, life history, and more.