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2. Freshwater aquarium - Wikipedia

   en.wikipedia.org/wiki/Freshwater_aquarium

   For a tropical fish tank, maintaining a warm environmental temperature ranging between 75 and 86 °F (24 to 30 °C) enables different tropical fish to thrive at different temperatures. [2] Aquarium substrate usually consists of sand or gravel. Aquarium substrate is important for the fishes health, and replicating their natural environment.

3. Goldfish - Wikipedia

   en.wikipedia.org/wiki/Goldfish

   The optimum temperature for goldfish is between 20 and 22 °C (68 and 72 °F). [46] Like all fish, goldfish do not like to be petted. In fact, touching a goldfish can endanger its health, because it can cause the protective slime coat to be damaged or removed, exposing the fish's skin to infection from bacteria or water-borne parasites.

4. Fishkeeping - Wikipedia

   en.wikipedia.org/wiki/Fishkeeping

   Most fish and plant species tolerate only a limited range of water temperatures: Tropical or warm water aquaria maintain an average temperature of about 25 °C (77 °F) are much more common, and tropical fish are among the most popular aquarium denizens. Cold water aquaria maintain temperatures below the room temperature.

5. Common goldfish - Wikipedia

   en.wikipedia.org/wiki/Common_goldfish

   The common goldfish is a breed of goldfish and a family of Cyprinidae in the order cypriniformes. Goldfish are descendants of wild carp from East Asia. [ 1] Most varieties of fancy goldfish were derived from this simple breed. [ 2] [better source needed] Common goldfish come in a variety of colors including red, orange, red/white, white/black ...

6. Vision in fish - Wikipedia

   en.wikipedia.org/wiki/Vision_in_fish

   Fish are normally cold-blooded, with body temperatures the same as the surrounding water. However, some oceanic predatory fish, such as swordfish and some shark and tuna species, can warm parts of their body when they hunt for prey in deep and cold water. The highly visual swordfish uses a heating system involving its muscles which raises the ...

7. Tropical fish - Wikipedia

   en.wikipedia.org/wiki/Tropical_fish

   Aquarium fish. Tropical fish is a term commonly used to refer to fish that are kept in heated aquariums. Freshwater tropical fish are more commonly kept than saltwater tropical fish due to the common availability of fresh water sources, such as tap water, whereas salt water is not commonly available and has to be recreated by using fresh water ...