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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]
They have one of the highest brain-to-body mass ratios [27] and the largest brain size of all fish. [28] Their brains have retia mirabilia which may serve to keep them warm. [ 29 ] M. alfredi has been shown to dive to depths over 400 metres (1,300 ft), [ 30 ] while the Chilean devil ray, which has a similar structure, dives to nearly 2,000 ...
The giant oceanic manta ray can grow up to a maximum of 9 m (30 ft) in length [6] and to a disc size of 7 m (23 ft) across with a weight of about 3,000 kg (6,600 lb), [7] [8] but the average size commonly observed is 4.5 m (15 ft). [9] It is dorsoventrally flattened and has large, triangular pectoral fins on either side of the disc. At the ...
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 ...
A fisherman in northern Cambodia hooked what researchers say is the world’s largest freshwater fish — a giant stingray that scientists know relatively little
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 mysterious shark that may count as the world’s largest predatory fish appears to be in decline off the U.S., prompting a rush to gather as much information as possible about the secretive ...