1.Any of numerous cartilaginous fishes of the subclass Elasmobranchii that are chiefly carnivorous and marine. Sharks have a streamlined torpedolike body, five to seven gill openings on each side of the head, a large oil-filled liver, and tough skin covered with small toothlike scales. ...
It can find small amounts of matters in water such as blood body liquids and chemicals produced by animals. These powerful senses help sharks find their food. Sharks eat fish other sharks and plants that live in the ocean. Sharks grow slowly. About forty percent of all sharks lay eggs. ...
Attacks on humans occur when sharks are hungry, harassed, or, in some cases, defending territory, though many interactions with humans appear more likely to be due to mistaken identity. Provocation is heightened by the kicking or thrashing vibrations people make in the water (which to sharks res...
In South American freshwater stingrays, Potamotrygon sp., gradually acclimated (≈2 months) to 40% seawater, plasma Na+ and Cl− levels were elevated, but Hct remained unchanged, indicating the ability of these rays to maintain water balance. Furthermore, Potamotrygon Hb is insensitive to Cl...
underwater sounds originate, something humans cannot do. Sharks can also locate prey by detecting the weak electric fields their prey emit. This electro-sensitivity may also allow them to navigate using the earth's geomagnetic fields. Many sharks have relatively largebrains, with brain tobody ...
Mucus layer covering the body, white underbelly, and preference for cool water Large body size and gill slits, ability to open jaw extremely wide, and crescent shaped tail Large body size and gill slits, migratory behavior, and mucus layer covering the body ...
Sharks have multiple rows of sharp teeth and can smell blood within water from up to a mile away.23Unless forced to, sharks don't like eating humanoids and only attack them and small boats if mistaken forsealsor desperate, being the perpetuating sorce of the sharks are maneaters myth23. ...
So, while sharks and dolphins might share the same ocean and have similar body shapes, they’re two completely different creatures. One’s a mammal, the other’s a fish. One breathes air, the other breathes water. One has a single set of teeth, the other has a conveyor belt of chomper...
The water taken in by whale sharks is not filtered through gill rakers, as in basking sharks, but instead through 20 large pad-like structures more similar to those found in rays (Motta et al., 2010). Suction feeding has been suggested as more efficient in extremely dense patches of ...
Particles are retained passively, based upon their ability to pass through the pores in the filter. (B) With cross-flow filtration, fewer particles escape through the pores. Water motion retains even small particles and keeps many of them from contacting, and therefore passing through, the pores...