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Freshwater fish of Mexico — species native to rivers, lakes, streams, and ephemeral waters within Mexican North America; Pages in category "Freshwater fish of ...
The tambaqui is the heaviest characin in the Americas (the lighter Salminus can grow longer) and the second heaviest scaled freshwater fish in South America (after the arapaima). [6] It can reach up to 1.1 m (3.6 ft) in total length and 44 kg (97 lb) in weight, [ 5 ] but a more typical size is 0.7 m (2.3 ft). [ 2 ]
Endemic fish of Mexico (2 C, 142 P) ˜ Freshwater fish of Mexico (228 P) ...
The surface and cave forms of the Mexican tetra have proven powerful subjects for scientists studying evolution. [28] When the surface-dwelling ancestors of current cave populations entered the subterranean environment, the change in ecological conditions rendered their phenotype—which included many biological functions dependent on the presence of light—subject to natural selection and ...
The urinary bladder of teleosts is permeable to water, though this is less true for freshwater dwelling species than saltwater species. [37]: p. 219 In freshwater fish the bladder is a key site of absorption for many major ions [38] in marine fish urine is held in the bladder for extended periods to maximise water absorption. [38]
The bowfin (Amia calva) is a ray-finned fish native to North America. Common names include mudfish, mud pike, dogfish, grindle, grinnel, swamp trout, and choupique.It is regarded as a relict, being one of only two surviving species of the Halecomorphi, a group of fish that first appeared during the Early Triassic, around 250 million years ago.
This fish is one of the larger cichlids. The body is oval and flattened on the sides and the head is tapering towards the mouth. Fins are spiny. It has a base color of yellow-brown to gray-brown in most cases, that becomes intense red during breeding. The head and throat are reddish, especially in younger fish.
The diet of the arapaima consists of fish, crustaceans, fruits, seeds, insects, and small land animals that walk near the shore. [18] The fish is an air breather , using its labyrinth organ , which is rich in blood vessels and opens into the fish's mouth, [ 19 ] an advantage in oxygen-deprived water that is often found in the Amazon River .