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As fish are a hugely diverse taxon, with over 30,000 described species of fish, the sleep behaviours and characteristics differ between species. For a long time, researchers overlooked sleep behaviour in fish and other ecothermic taxa [ 3 ] , as the definition of sleep included slow-wave cortical activity and rapid eye movement .
Fish vision shows adaptation to their visual environment, for example deep sea fishes have eyes suited to the dark environment. Fish and other aquatic animals live in a different light environment than terrestrial species. Water absorbs light so that with increasing depth the
Sleep can follow a physiological or behavioral definition. In the physiological sense, sleep is a state characterized by reversible unconsciousness, special brainwave patterns, sporadic eye movement, loss of muscle tone (possibly with some exceptions; see below regarding the sleep of birds and of aquatic mammals), and a compensatory increase following deprivation of the state, this last known ...
This means literally 'sleeping outside', from ἔξω, 'outside', and κοῖτος, 'bed', 'resting place', with the verb root κει-, 'to lie down' (not 'untruth'), [7] so named as flying fish were believed to leave the water to sleep ashore, [8] or due to flying fish flying and thus stranding themselves in boats.
The body of a fish is denser than water, so fish must compensate for the difference or they will sink. Many bony fishes have an internal organ called a swim bladder, or gas bladder, that adjusts their buoyancy through manipulation of gases. In this way, fish can stay at the current water depth, or ascend or descend without having to waste ...
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In early development, the four-eyed fish’s frontal bone expands dorsally allowing the eyes to be positioned on top of their head and appear bulging. [5] This allows the fish to simultaneously see above and below the water as it floats at the surface. The eyes are divided into dorsal and ventral halves, separated by a pigmented strip of tissue.
Image credits: TheNutsFlush21 #5. Target we have a “code yellow” for missing kids. Whole team drops what they are doing and we all help. Usually child is found within minutes.