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The U.S. Open Swimming Championships, or U.S. Open, is a championship meet organized by USA Swimming which is open to international teams/swimmers. It was first held in 1985, and was held annually in December through 2006. [1] Beginning in 2007, the meet's first-weekend-of-December timing was given over to the resurrected USA Short Course ...
The bathypelagic zone or bathyal zone (from Greek βαθύς (bathýs), deep) is the part of the open ocean that extends from a depth of 1,000 to 4,000 m (3,300 to 13,000 ft) below the ocean surface. It lies between the mesopelagic above and the abyssopelagic below. The bathypelagic is also known as the midnight zone because of the lack of ...
A number of species have evolved narrow snouts, as in gar fish and water snakes. [22] Herrings often hunt copepods. If they encounter copepods schooling in high concentrations, the herrings switch to ram feeding. They swim with their mouth wide open and their opercula fully expanded.
The 2020 Toyota U.S. Open Swimming Championships were contested from November 12 to 14, 2020 in a virtual competition format at nine locations in the United States with medalists determined from the merged results across all nine locations. [1][2][3][4] Competition was conducted in long course (50 meter) pools. [1][5]
Aquatic respiration. Sea slugs respire through a gill (or ctenidium) Aquatic respiration is the process whereby an aquatic organism exchanges respiratory gases with water, obtaining oxygen from oxygen dissolved in water and excreting carbon dioxide and some other metabolic waste products into the water.
Fish physiology is the scientific study of how the component parts of fish function together in the living fish. [ 2 ] It can be contrasted with fish anatomy, which is the study of the form or morphology of fishes. In practice, fish anatomy and physiology complement each other, the former dealing with the structure of a fish, its organs or ...
In Late Devonian vertebrate speciation, descendants of pelagic lobe-finned fish such as Eusthenopteron exhibited a sequence of adaptations: Panderichthys, suited to muddy shallows; Tiktaalik with limb-like fins that could take it onto land; early tetrapods in weed-filled swamps, such as Acanthostega, which had feet with eight digits, and Ichthyostega, which had limbs.
Psychrolutidae. The fish family Psychrolutidae (commonly known as blobfishes, [2] south america river teacher, [2] flathead sculpins, [2] or tadpole sculpins[2]) contains over 35 recognized species in 8 genera. [3] This family consists of bottom-dwelling marine sculpins shaped like tadpoles, with large heads and bodies that taper back into ...