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2. Water quality - Wikipedia

   en.wikipedia.org/wiki/Water_quality

   Water quality refers to the chemical, physical, and biological characteristics of water based on the standards of its usage. [1][2] It is most frequently used by reference to a set of standards against which compliance, generally achieved through treatment of the water, can be assessed.

3. Freshwater fish - Wikipedia

   en.wikipedia.org/wiki/Freshwater_fish

   Freshwater fish. Tench are common freshwater fish throughout temperate Eurasia. Freshwater fish are fish species that spend some or all of their lives in bodies of fresh water such as rivers, lakes and inland wetlands, where the salinity is less than 1.05%. These environments differ from marine habitats in many ways, especially the difference ...

4. Fishless cycling - Wikipedia

   en.wikipedia.org/wiki/Fishless_cycling

   The most significant advantage of fishless cycling is that it can reduce fish loss due to ammonia and nitrite spikes. Fish loss can be very discouraging for beginners of fish keeping, so indirectly, fishless cycling can also help beginners get a good start. Cycling aquariums using feeder fish is risky, because it infects the aquarium with any ...

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. Refugium (fishkeeping) - Wikipedia

   en.wikipedia.org/wiki/Refugium_(fishkeeping)

   Refugium (fishkeeping) A refugium in an all-in-one aquarium. In fishkeeping, a refugium is an appendage to a marine, brackish, or freshwater fish tank that shares the same water supply. It is a separate sump, connected to the main show tank. [1] It is a "refugium" in the sense that it permits organisms to be maintained that would not survive in ...

7. Fishkeeping - Wikipedia

   en.wikipedia.org/wiki/Fishkeeping

   United Nations studies show that more than 90% of freshwater aquarium fish are captive–bred, while virtually all marine fish and invertebrates are wild-caught. Freshwater fish habitats are threatened by habitat erosion from pollution, dams and hydropower, commercial fishing, climate change, the introduction of invasive species and disease. [32]