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Sleep can be defined in birds and mammals by eye closure and typical electrical patterns in the neocortex, but fish lack eyelids and a neocortex.Yet this oscar is behaviorally quiescent at night, lying unresponsive on the bottom with its eyes turned downward, and might be said to sleep.
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 ...
Like other fish, betta fish do "sleep." But fish do not sleep in the same way mammals do. Fish rest by slowing down their activity and metabolism, the National Oceanic and Atmospheric ...
After laying her cluster of eggs, the female cuttlefish secretes ink on them making them look very similar to grapes. The egg case is produced through a complex capsule of the female accessory genital glands and the ink bag. [40] On occasion, a large competitor arrives to threaten the male cuttlefish.
The spawning fish select sandy or pebbly shallows and deposit their eggs primarily between sundown and midnight. Females release eggs in batches of about 30,000 eggs, though very large fish deposit an estimated as many as 156,000 eggs. Total annual egg production is 200,000–600,000 eggs per female, with larger fish producing more.
In practice, fish anatomy and physiology complement each other, the former dealing with the structure of a fish, its organs or component parts and how they are put together, such as might be observed on the dissecting table or under the microscope, and the latter dealing with how those components function together in the living fish.
For example, silver carp can spawn multiple times each reproductive season — and they can lay anywhere from 145,000 to 5,400,000 eggs, according to estimates from the U.S. Fish and Wildlife ...
Flying fish for sale in local fish market of Saint Martin's Island, Bangladesh Barbados is known as "the land of the flying fish", and the fish is one of the national symbols of the country. Once abundant, it migrated between the warm, coral -filled Atlantic Ocean surrounding the island of Barbados and the plankton-rich outflows of the Orinoco ...