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A fish (pl.: fish or fishes) is an aquatic, anamniotic, gill-bearing vertebrate animal with swimming fins and a hard skull, but lacking limbs with digits.Fish can be grouped into the more basal jawless fish and the more common jawed fish, the latter including all living cartilaginous and bony fish, as well as the extinct placoderms and acanthodians.
Common names of fish can refer to a single species; to an entire group of species, such as a genus or family; or to multiple unrelated species or groups.Ambiguous common names are accompanied by their possible meanings.
Freshwater fish are fish species that spend some or all of their lives in bodies of fresh water such as rivers, lakes, ponds and inland wetlands, where the salinity is less than 1.05%. These environments differ from marine habitats in many ways, especially the difference in levels of osmolarity .
A general rule is have 1 square foot (0.093 m 2). Active aeration by way of a water pump , filter or fountain effectively increases the surface area agitation. The goldfish is classified as a coldwater fish , and can live in unheated aquaria at a temperature comfortable for humans.
Common bream caught in the Volga River near Kashin, Russia. Bream (/ ˈ b r iː m /, [1] US also / ˈ b r ɪ m / ⓘ [1] [2]) are species of freshwater fish belonging to a variety of genera including Abramis [3] [4] (e.g., A. brama, the common bream), Ballerus, Blicca, Brama, Chilotilapia, Etelis, Lepomis, Gymnocranius, Lethrinus, Nemipterus, Pharyngochromis, Rhabdosargus, Scolopsis, or ...
Cod (pl.: cod) is the common name for the demersal fish genus Gadus, belonging to the family Gadidae. [1] Cod is also used as part of the common name for a number of other fish species, and one species that belongs to genus Gadus is commonly not called cod (Alaska pollock, Gadus chalcogrammus).
In general, sharks show little pattern of attacking humans specifically, part of the reason could be that sharks prefer the blood of fish and other common preys. [107] Research indicates that when humans do become the object of a shark attack, it is possible that the shark has mistaken the human for species that are its normal prey, such as seals.
The above scheme is the one most commonly encountered in non-specialist and general works. Many of the above groups are paraphyletic, in that they have given rise to successive groups: Agnatha are ancestral to Placodermi, who again have given rise to Osteichthyes, as well as to Acanthodii, the ancestors of Chondrichthyes.
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