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Fish typically have quite small brains relative to body size compared with other vertebrates, typically one-fifteenth the brain mass of a similarly sized bird or mammal. [10] However, some fish have relatively large brains, most notably mormyrids and sharks, which have brains about as massive relative to body weight as birds and marsupials. [11]
At an aquarium in Coburg, Germany, an octopus named Otto was known to juggle his fellow tank-mates around, as well as throw rocks to smash the aquarium glass. On more than one occasion, Otto even caused short circuits by crawling out of his tank and shooting a jet of water at the overhead lamp.
It is by far the largest family in the order, with around 200 species. Members of the family can be popular, if challenging, aquarium species. These fish have a large brain size and unusually high intelligence.
These delightful little angelfish are highly prized as aquarium fish, with an exorbitant price tag beyond the realms of most aquarists. A single fish has sold for $30,000.
The cleaner wrasse fish appears to recognize its own visage in an underwater mirror. Octopuses seem to react to anesthetic drugs and will avoid settings where they likely experienced past pain.
Neon tetra info. Paracheirodon innesi Class: Actinopterygii Water: Fresh Diet: Omnivore Lifespan: Up to 5 years Neon tetras can live in a freshwater tropical aquarium, and their bright blue and ...
Despite this, increasing evidence indicates that fish possess not just capabilities that cannot be explained through Pavlovian and operant conditioning alone, such as reversal learning, novel obstacle avoidance, and passing simultaneous two-choice tasks, but also even more complex capabilities such as navigational cognitive mapping, [176] [177 ...
Many color and tail pattern varieties exist. They generally need a ratio of 1 male to 2 females or more. All guppies and mollies are hardy fish that tolerate lower oxygen levels and temperatures than most aquarium fish, give birth to live young, and readily breed in home tanks. [58] can live in full sea water [59] 66 °F - 84 °F (19 °C - 29 °C)