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Fish are the gill-bearing aquatic craniate animals that lack limbs with digits. They form a sister group to the tunicates, together forming the olfactores. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Tetrapods emerged within lobe-finned fishes, so cladistically they are fish as well. However, traditionally fish are rendered paraphyletic by excluding the tetrapods (i.e., the amphibians, reptiles, birds and mammals which all descended from within the same ancestry). Because in this manner the term "fish" is defined negatively as a paraphyletic group, it is not considered a formal taxonomic grouping in systematic biology. The traditional term pisces (also ichthyes) is considered a typological, but not a phylogenetic classification. The earliest organisms that can be classified as fish were soft-bodied chordates that first appeared during the Cambrian period. Although they lacked a true spine, they possessed notochords which allowed them to be more agile than their invertebrate counterparts. Fish would continue to evolve through the Paleozoic era, diversifying into a wide variety of forms. Many fish of the Paleozoic developed external armor that protected them from predators. The first fish with jaws appeared in the Silurian period, after which many (such as sharks) became formidable marine predators rather than just the prey of arthropods. Most fish are ectothermic ("cold-blooded"), allowing their body temperatures to vary as ambient temperatures change, though some of the large active swimmers like white shark and tuna can hold a higher core temperature.[1][2] Fish are abundant in most bodies of water. They can be found in nearly all aquatic environments, from high mountain streams (e.g., char and gudgeon) to the abyssal and even hadal depths of the deepest oceans (e.g., gulpers and anglerfish). With 33,600 described species, fish exhibit greater species diversity than any other group of vertebrates.[3] Fish are an important resource for humans worldwide, especially as food. Commercial and subsistence fishers hunt fish in wild fisheries (see fishing) or farm them in ponds or in cages in the ocean (see aquaculture). They are also caught by recreational fishers, kept as pets, raised by fishkeepers, and exhibited in public aquaria. Fish have had a role in culture through the ages, serving as deities, religious symbols, and as the subjects of art, books and movies.

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魚は、数字で手足がないギル軸受水生 craniate 動物です。彼らは姉妹を形成 tunicates、一緒に、olfactores を形成するグループ。この定義に含まれている生きているヌタウナギ、ヤツメウナギ、軟骨性と骨質の魚と様々 な絶滅した関連グループ。テトラポッドと経たず、だから cladistic 葉フィン魚

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Fish is Gill-bearing aquatic craniate animal figures missing limbs. They are the sister formation tunicates, together, to form the olfyctore group. Hagfish are living are included in this definition, Lampreys, cartilaginous and bony fish and various extinct related groups. Time-tested and tetrapods

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魚は鰓軸受水生 craniate 動物フィギュアの四肢欠損です。彼らが姉妹形成 tunicates、一緒に、olfyctore グループを形成します。メクラウナギが住んでいるこの定義、ヤツメウナギ、軟骨および骨の多い魚と様々 な絶滅した関連グループに含まれています。長年、テトラポッド

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Fish are animals of aquatic craniate, Gill bearing limb loss. They formed olfyctore group together, the sisters formed tunicates,. This definition where the Hagfish, Lampreys, cartilage and bones of fish and various extinct related groups are included. Over the years, Te.

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魚、水生 craniate、軸受手足損失ギルの動物です。彼らは一緒に olfyctore グループを形成、姉妹結成、アステラス製薬。この定義は、ヌタウナギ、ヤツメウナギ、軟骨、魚と関連する様々 な絶滅したグループの骨が含まれています。長年、テ。

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Is an animal for fish and aquatic craniate, bearing limb loss Gil. They together form the olfyctore group, sisters formed the tunicates. This definition include many extinct groups and Hagfish, Lampreys, cartilaginous fishes related to bone. Over the years, te's.

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魚や水生 craniate、ベアリング手足損失ギルの動物です。彼らは一緒に olfyctore グループを形成、姉妹は、アステラス製薬を設立しました。この定義は、多くの絶滅したグループとヌタウナギ、ヤツメウナギ、骨に関連した軟骨魚類。長年、te の。

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Is an animal for fish and aquatic craniate, bearing limb loss Gil. They formed the olfyctore group together, the sisters founded the tunicates. This definition is a cartilaginous fish related to many extinct groups, Hagfish and Lampreys, and bone. Over the years, Te.

INTO JAPANESE

魚や水生 craniate、ベアリング手足損失ギルの動物です。彼らは一緒に olfyctore グループを形成し、姉妹が、アステラス製薬を設立しました。この定義は、多くの絶滅したグループ、ヌタウナギとヤツメウナギ、および骨に関連する軟骨魚です。長年、テ。

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Is an animal for fish and aquatic craniate, bearing limb loss Gil. They formed the olfyctore group together, the sisters founded the Astellas Pharma. This definition is a cartilaginous fish related to many extinct groups, Hagfish and Lampreys, and bone. Over the years, te's.

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魚や水生 craniate、ベアリング手足損失ギルの動物です。彼らは一緒に olfyctore グループを形成、姉妹は、アステラス製薬を設立しました。この定義は、多くの絶滅したグループ、ヌタウナギとヤツメウナギ、および骨に関連する軟骨魚です。長年、te の。

BACK INTO ENGLISH

Is an animal for fish and aquatic craniate, bearing limb loss Gil. They formed the olfyctore group together, the sisters founded the tunicates. This definition is a cartilaginous fish related to many extinct groups, Hagfish and Lampreys, and bone. Over the years, Te.

INTO JAPANESE

魚や水生 craniate、ベアリング手足損失ギルの動物です。彼らは一緒に olfyctore グループを形成し、姉妹が、アステラス製薬を設立しました。この定義は、多くの絶滅したグループ、ヌタウナギとヤツメウナギ、および骨に関連する軟骨魚です。長年、テ。

BACK INTO ENGLISH

Is an animal for fish and aquatic craniate, bearing limb loss Gil. They formed the olfyctore group together, the sisters founded the Astellas Pharma. This definition is a cartilaginous fish related to many extinct groups, Hagfish and Lampreys, and bone. Over the years, te's.

INTO JAPANESE

魚や水生 craniate、ベアリング手足損失ギルの動物です。彼らは一緒に olfyctore グループを形成、姉妹は、アステラス製薬を設立しました。この定義は、多くの絶滅したグループ、ヌタウナギとヤツメウナギ、および骨に関連する軟骨魚です。長年、te の。