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  2. Recirculating aquaculture system - Wikipedia

    en.wikipedia.org/wiki/Recirculating_aquaculture...

    The first step of nitrification in the biofilter consumes alkalinity and lowers the pH of the system. [11] Keeping the pH in a suitable range (5.0-9.0 for freshwater systems) is crucial to maintain the health of both the fish and biofilter. pH is typically controlled by the addition of alkalinity in the form of lime (CaCO 3) or sodium hydroxide ...

  3. Calcium reactor - Wikipedia

    en.wikipedia.org/wiki/Calcium_reactor

    A pH controller is recommended to control the CO2. It works by connecting to the CO2 regulator on the CO2 tank and measuring the pH of the solution inside the reactor via a pH probe. The controller will turn on and off the flow of CO2 based on the pH inside the reactor. The pH range for the typical calcium reactor is 6.5–6.8.

  4. Raceway (aquaculture) - Wikipedia

    en.wikipedia.org/wiki/Raceway_(aquaculture)

    In a well designed system, the existing water in the raceway is largely replaced by new water when the same volume of new water enters the raceway. Self-cleaning can sometimes be achieved if the fish stocks density is sufficiently high and the water level is sufficiently low. For example, if trout are stocked at 20 kilograms per cubic metre ...

  5. Freshwater aquarium - Wikipedia

    en.wikipedia.org/wiki/Freshwater_aquarium

    A freshwater aquarium is a receptacle that holds one or more freshwater aquatic organisms for decorative, pet-keeping, or research purposes. Modern aquariums are most often made from transparent glass or acrylic glass. Typical inhabitants include fish, plants, amphibians, and invertebrates, such as snails and crustaceans. Tropical freshwater ...

  6. Hypoxia in fish - Wikipedia

    en.wikipedia.org/wiki/Hypoxia_in_fish

    A fish's hypoxia tolerance can be represented in different ways. A commonly used representation is the critical O 2 tension (P crit), which is the lowest water O 2 tension (P O 2) at which a fish can maintain a stable O 2 consumption rate (M O 2). [2]

  7. Community aquarium - Wikipedia

    en.wikipedia.org/wiki/Community_aquarium

    Most freshwater aquarium fish do well in water that is soft to moderately hard, and that has a pH between 6 and 8. Brackish water aquaria are a special case and need dedicated community tanks. While a few freshwater and marine fish can adapt to brackish water, most cannot.

  8. Substrate (aquarium) - Wikipedia

    en.wikipedia.org/wiki/Substrate_(aquarium)

    For freshwater aquaria, gravel is the most common substrate. To prevent damage to fish, gravel should not be sharp. Aquarium gravel can be as coarse as pea-sized or as fine as 1–2 mm. [1] It is available in a number of colors, and may be naturally colored or dyed, and may have a polymer seal to ensure it does not affect water chemistry. [1]

  9. Aquarium - Wikipedia

    en.wikipedia.org/wiki/Aquarium

    The typical hobbyist aquarium includes a filtration system, an artificial lighting system, an air diffuser and pump, and a heater or chiller depending on the aquarium's inhabitants. Many aquaria incorporate a hood, containing the lights, to decrease evaporation and prevent fish from leaving the aquarium (and anything else from entering the ...

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