Fish
Fish
Fish (pronunciation: /fɪʃ/) are a group of aquatic animals that first appeared during the Cambrian explosion, around 530 million years ago. The term "fish" is used to describe a diverse range of water-dwelling creatures, including both vertebrates and invertebrates.
Etymology
The word "fish" comes from the Old English fisc, which is related to the Old High German fisc and the Latin piscis. All these words are derived from the Proto-Indo-European root *peisk-, which means "fish".
Types of Fish
Fish can be broadly classified into three main groups: jawless fish, cartilaginous fish, and bony fish.
- Jawless Fish: This group includes species like lampreys and hagfish, which lack jaws and paired fins.
- Cartilaginous Fish: This group includes sharks, rays, and skates, which have skeletons made of cartilage rather than bone.
- Bony Fish: This is the largest group of fish, including species like salmon, tuna, and trout, which have skeletons made of bone.
Related Terms
- Ichthyology: The scientific study of fish.
- Fishery: An area with a large population of valuable fish.
- Aquaculture: The farming of fish, shellfish, and aquatic plants.
- Piscivorous: Animals that eat fish.
- Fish migration: The regular journey of fish from one place to another.
- Fish anatomy: The study of the form or morphology of fishes.
- Fish diseases and parasites: Diseases and parasites that affect fish.
- Fishkeeping: The hobby of keeping fish in aquariums.
External links
- Medical encyclopedia article on Fish
- Wikipedia's article - Fish
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