Fish species
Fish (c. Fish; and one fish) .asamkh is any member of that group of organisms populist similarities, which includes all aquatic animals with gills and cranial lacking to related parties fingers. And it falls under this definition eel fish, eels, fish cartilage and bone present, as well as various extinct related groups of fish. Most fish are external heat objects ("with cold blood"), allowing the heat of their bodies difference with the change of ambient temperatures, despite the fact that some big fish actively swim like white shark and tuna can keep the degree underground temperature higher than the ambient temperature. [1] [2] Most species of fish have bones and some other species, such as sharks have no real bones are even cartilage. Some fish are small length of 1 cm or less, others large and long in length up to 15 meters and weighs 15 tons, as in the shark and the whale.
Fish available in most bodies of water. It can almost be found in all aquatic environments, from high mountain streams (such as char and thickness gobies) to great depths and even Kndeghih of the deepest oceans (for example, Eel ingested fish anglerfish). As that some fish live in fresh water in Lakes, rivers and marshes, others live in salt water in the seas and oceans. There are about 32,000 species of fish, thus the most diverse of any other group of vertebrates. [3]
Fish supplier of important resources for human beings all over the world and more types is a key food for humans. And fish species that are more desirable than others is the carp and cod, herring, sardines and tuna. Professional fishermen and Ulkipavion hunt fish from wild fisheries (see fishing) or Bastzeralla in pools or in cages in the ocean (see aquaculture). And it is also caught by recreational fishing or sports lovers, or to keep them as pets by fish breeding hobby lovers, or to display in public pools. Fish has played an important role in culture through the ages, Vozvt of divinity and in the religious symbols, and as employed in the arts, books and movies.
The word "fish" or "fish" is a term that is defined negatively, and excludes him quartets legs (such as amphibians, reptiles, birds and mammals) which descend from between the folds of the same advances. So it is a quasi-populist term, did not reflect the vital sound rating in the science of the regular neighborhoods. Other traditional terms such as Asamkiat pisces (or ichthyes) are typical Nmtihoo terms, but they are not classified in the science of evolution breeds. Some other species of animals that live in the sea, such as sea stars and jellyfish also called fish but they are not fish. Molluscs also objects with various coincidences such as shellfish, and crustaceans such as shrimp, shrimp and crabs are not fish.
The oldest living organisms that can be classified as one of the fish is limp body chordates that first appeared during the Cambrian period. Although they lacked a true spine, they possessed ropes dorsal allowed them to be more flexible than their counterparts of invertebrates. Fish continued to develop during the initial period, and a variety of broad cruel way. Many of the initial era fish developed external shields to protect them from predators. Unpack her first fish appeared in the Silurian period, after which many of them became (such as sharks) formidable predators freely instead of being just prey for the objects of arthropods Division.
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