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Zangroniz said studies only use a few species of fish and don't represent the more than 30,000 fish species that exist. She added pain is measured in mammals on the grimace scale, often seen in ...
Sharks and other cartilaginous fish (skates and rays) have skeletons made of cartilage and connective tissue. Cartilage is flexible and durable, yet is about half the normal density of bone. This reduces the skeleton's weight, saving energy. [29] Because sharks do not have rib cages, they can easily be crushed under their own weight on land. [30]
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]
Elasmobranchii (/ ɪ ˌ l æ z m ə ˈ b r æ ŋ k i aɪ / [6]) is a subclass of Chondrichthyes or cartilaginous fish, including modern sharks (superorder Selachii), rays, skates, and sawfish (superorder Batoidea).
Some fish, such as catfish and sharks, have organs that detect weak electric potentials on the order of millivolts. [24] Other fish, like the South American electric fishes Gymnotiformes, can produce weak electric currents, which they use in navigation and social communication. In sharks, the ampullae of Lorenzini are electroreceptor organs ...
A second video recorded minutes later shows the sharks eventually gave up, but continued to circle the boat. One clinched its teeth on a rope tied to the boat and held tight — until the rope ...
Shortfin mako sharks over 3 m (9.8 ft) have interior teeth considerably wider and flatter than smaller mako, which enables them to prey effectively upon dolphins, swordfish, and other sharks. [18] An amateur videotape, taken in Pacific waters, shows a moribund pantropical spotted dolphin whose tail was almost completely severed being circled by ...
While more sharks than you’ll notice will be swimming near you during spring break in Myrtle Beach, SC, here’s why you shouldn’t worry too much.