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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]
However, research published in 1996 in The Journal of Experimental Biology by Göran Nilsson at Uppsala University found that mormyrinae brains utilize roughly 60% of their body O 2 consumption. [1] This is due to the combination of large brain size (3.1% of body mass compared to 2% in humans) and them being ectothermic. [1]
The human brain contains 86 billion neurons, with 16 billion neurons in the cerebral cortex. [ 2 ] [ 1 ] Neuron counts constitute an important source of insight on the topic of neuroscience and intelligence : the question of how the evolution of a set of components and parameters (~10 11 neurons, ~10 14 synapses) of a complex system leads to ...
The brain is the size of an egg,” said Francesca Pancaldi, first author of the study and a researcher at Centro Interdisciplinario de Ciencias Marinas in Mexico. “It’s a big, big fish that ...
Recent research indicates that, in non-human primates, whole brain size is a better measure of cognitive abilities than brain-to-body mass ratio. The total weight of the species is greater than the predicted sample only if the frontal lobe is adjusted for spatial relation. [ 19 ]
A size comparison of a whale shark and a human. The cartilaginous fish are not directly related to the "bony fish," but are sometimes lumped together for simplicity in description. The largest living cartilaginous fish, of the order Orectolobiformes, is the whale shark (Rhincodon typus), of the world's tropical oceans.
A fisherman in northern Cambodia hooked what researchers say is the world’s largest freshwater fish — a giant stingray that scientists know relatively little
Italian fisherman Dino Ferrari caught a 280-lb. Wels Catfish Thursday in Italy's Po Delta river, setting a new record. The U.K. Mirror reported that the catch is the world's largest wels catfish ...