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  2. Aquatic respiration - Wikipedia

    en.wikipedia.org/wiki/Aquatic_respiration

    Others may breathe atmospheric air while remaining submerged, via breathing tubes or trapped air bubbles, though some aquatic insects may remain submerged indefinitely and respire using a plastron. A number of insects have an aquatic juvenile phase and an adult phase on land. In these case adaptions for life in water are lost at the final ecdysis.

  3. Fish gill - Wikipedia

    en.wikipedia.org/wiki/Fish_gill

    The concentration of oxygen in water is lower than air and it diffuses more slowly. In a litre of freshwater the oxygen content is 8 cm 3 per litre compared to 210 in the same volume of air. [7] Water is 777 times more dense than air and is 100 times more viscous. [7] Oxygen has a diffusion rate in air 10,000 times greater than in water. [7 ...

  4. Fish physiology - Wikipedia

    en.wikipedia.org/wiki/Fish_physiology

    Breathing air is primarily of use to fish that inhabit shallow, seasonally variable waters where the water's oxygen concentration may seasonally decline. Fish dependent solely on dissolved oxygen, such as perch and cichlids , quickly suffocate, while air-breathers survive for much longer, in some cases in water that is little more than wet mud.

  5. Gill - Wikipedia

    en.wikipedia.org/wiki/Gill

    A cubic meter of air contains about 275 grams of oxygen at STP. Fresh water hold less than 1/25th the oxygen content of air, the dissolved oxygen content being approximately 8 cm 3 /L compared to that of air which is 210 cm 3 /L. [4] Water is 777 times more dense than air and is 100 times more viscous. [4]

  6. Swim bladder - Wikipedia

    en.wikipedia.org/wiki/Swim_bladder

    The swim bladder, gas bladder, fish maw, or air bladder is an internal gas-filled organ in bony fish (but not cartilaginous fish [1]) that functions to modulate buoyancy, and thus allowing the fish to stay at desired water depth without having to maintain lift via swimming, which expends more energy. [2]

  7. Aquatic animal - Wikipedia

    en.wikipedia.org/wiki/Aquatic_animal

    Some protists accomplish this using contractile vacuoles, while freshwater fish excrete excess water via the kidney. [4] Although most aquatic organisms have a limited ability to regulate their osmotic balance and therefore can only live within a narrow range of salinity, diadromous fish have the ability to migrate between fresh and saline ...

  8. Fish exposed to wastewater absorb many medications ... - AOL

    www.aol.com/news/2017-08-02-fish-exposed-to...

    Water treatment for standard contaminants doesn't get rid of pharmaceuticals very well, Meador says. "They have a pipe that goes into a river, estuary or somewhere else. And it's just this ...

  9. Amphibious fish - Wikipedia

    en.wikipedia.org/wiki/Amphibious_fish

    Swamp eels, which are not true eels, can absorb oxygen through their highly vascularized mouths and pharynges, and in some cases (e.g., Monopterus rongsaw) through their skin. Snakehead fish : This family of fish consists of obligate air breathers, using their suprabranchial organs, which are a primitive labyrinth organ.