oceany: Diversity of fish

Evidence: 100 • authority: 72

Fish are very diverse animals and can be categorised in many ways. Although most fish species have probably been discovered and described, about 250 new ones are still discovered every year. According to FishBase, about 34,800 species of fish had been described as of February 2022, which is more than the combined total of all other vertebrates: mammals, amphibians, reptiles and birds. Fish species are is divided roughly equally between marine (oceanic) and freshwater ecosystems. Coral reefs in the Indo-Pacific region constitute the center of diversity for marine fishes, whereas continental freshwater fishes are most diverse in large river basins of tropical rainforests, especially the Amazo…

Evidence: — • authority: 72

A shrimp (pl.: shrimp (US) or shrimps (UK)) is a common name typically used for crustaceans with an elongated body and a primarily swimming mode of locomotion. The name usually refers to decapods belonging to the Caridea or Dendrobranchiata, although some crustaceans outside this order are also referred to as "shrimp". More narrow definitions may be restricted to Caridea, to smaller species of either of the aforementioned groups, or only the marine species. Under a broader definition, shrimp may be synonymous with prawn, covering stalk-eyed swimming crustaceans with long, narrow muscular tails (abdomens), long whiskers (antennae), and slender, biramous legs. They swim forward by paddling th…