The oranda is a metallic or matte scaled goldfish that is similar in appearance to the veiltail. It has a large, long and deep body accompanied by a long quadruple tail. This four-lobed and contracted tail normally spreads out broadly when the oranda stops swimming. The back does not rise up to form a ryukin -like hump. [2][3]

2024年5月20日 · In this article we’ll explore fish neuroanatomy, look at fish species with unusually large brains, discuss what cognitive abilities big brained fish may have, and the evolutionary reasons behind these big brains.

Compared to similarly sized fish, mammals and birds typically have brain sizes fifteen times larger, though some species of fish such as elephantnose fish have very large brain-to-body ratios. However, fish still display intelligence that cannot be explained through Pavlovian and operant conditioning, such as reversal learning, novel obstacle ...

The Mormyridae, sometimes called "elephantfish" (more properly freshwater elephantfish), are a superfamily of weakly electric fish in the order Osteoglossiformes native to Africa. [1] 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.

2013年1月3日 · In a Swedish lab, Alexander Kotrschal has deliberately moulded the intelligence of small fish called guppies. From a starting population, he picked individuals with either unusually large or...

2016年12月21日 · The mormyrids have a reputation as large-brained fish and indeed one species (the fish in the top photo) has a brain that constitutes 3 percent of its body size, comparable to human brains, which range from 2 to 2.5 percent. But it was unclear whether other mormyrids were equally brainy.

Most Flower horn fish looks like as if they have a big brain on their head or some say it looks like a tumor, but that's just one of the Flower Horn fish feature. It is a popular pet...

New work in large-brained fish suggests skimping elsewhere is not enough to meet the energy demands of an extreme brain. As a species we're so brain-proud it doesn't occur to most of us...

2024年8月14日 · This article takes a detailed look a the size of a fish brain, memory and social cooperation of fish. If you have brain or memory related questions then this article has the answers.

The Peters' elephantnose fish, Gnathonemus petersii, has the largest brain-to-body weight ratio of all known vertebrates. Fish in this subfamily have a high brain to body mass ratio due to an expanded cerebellum (called a gigantocerebellum) used in their electroperception.