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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 ...
Another factor that threatens the native axolotl population is the introduction of invasive species such as the Nile tilapia and common carp. These invasive fish species threaten axolotl populations by eating their eggs or young and by out-competing them for natural resources.
The Aztec chub or Aztec shiner, [1] (Aztecula sallaei) is a species of freshwater ray-finned fish in the family Leuciscidae, the shiners, daces and minnows. [2] This species is endemic to Mexico . [ 3 ]
Cavefish or cave fish is a generic term for fresh and brackish water fish adapted to life in caves and other underground habitats. Related terms are subterranean fish, troglomorphic fish, troglobitic fish, stygobitic fish, phreatic fish, and hypogean fish.
A fish with limb-like fins that could take it onto land. [75] It is an example from several lines of ancient sarcopterygian fish developing adaptations to the oxygen-poor shallow-water habitats of its time, which led to the evolution of tetrapods. [61]
In Late Devonian vertebrate speciation, descendants of pelagic lobe-finned fish such as Eusthenopteron exhibited a sequence of adaptations: Panderichthys, suited to muddy shallows; Tiktaalik with limb-like fins that could take it onto land; early tetrapods in weed-filled swamps, such as Acanthostega, which had feet with eight digits, and Ichthyostega, which had limbs.
Gillnets are designed to catch fish of a certain size when the fish’s head passes through the net, but the body gets stuck. Theoretically, larger- and smaller-sized fish would either pass ...
The ahuizotl (from the Classical Nahuatl: āhuitzotl for "spiny aquatic thing", a.k.a. "water dog") is a legendary creature in Aztec mythology. [2] It is said to lure people to their deaths. [3] The creature was taken as an emblem by the ruler of the same name, and was said to be a "friend of the rain gods". [4]