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Sleep in fish. 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. [1]
The Feast of the Seven Fishes (Italian: Festa dei Sette Pesci) is an Italian American celebration of Christmas Eve with dishes of fish and other seafood. [1][2] It is not a "feast" in the sense of "holiday", but rather a grand meal. Christmas Eve is a vigil or fasting day, and the abundance of seafood reflects the observance of abstinence from ...
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 ...
The clown featherback (Chitala ornata), also known as the clown knifefish and spotted knifefish, is a nocturnal species of tropical fish with a long, knife-like body. This knifefish is native to freshwater habitats in Cambodia, China, Hong Kong, Laos, Macau, Thailand, and Vietnam, [2] but it has also been introduced to regions outside its native range. [1]
Especially active at night, these midnight foragers will live in harmony with common Goldfish, Neon Tetras, Swordtails, and Mollies. Food-wise, they’ll eat water weeds, roots, and leaves and ...
The walleye (Sander vitreus, synonym Stizostedion vitreum), also called the walleyed pike, [3] yellow pike, yellow pikeperch or yellow pickerel, [4] is a freshwater perciform fish native to most of Canada and to the Northern United States. It is a North American close relative of the European zander, also known as the pikeperch.
American eel. The American eel (Anguilla rostrata) is a facultative catadromous fish found on the eastern coast of North America. Freshwater eels are fish belonging to the elopomorph superorder, a group of phylogenetically ancient teleosts. [2] The American eel has a slender, supple, snake-like body that is covered with a mucus layer, which ...
The nightfish has an oblong and compressed body with a large, oblique mouth which has a slightly protruding lower jaw and which reached beyond the rear edge of the pupil. Both jaws and the roof of the mouth have bands of villiform teeth. It has an incomplete lateral line which has 43-47 tubed scales. There are large obvious open pores around ...