3-10+ years depending on species
1” to 12” + depending on species
Tropical fish – 76-78 degrees F
Goldfish/koi – 65-72 degrees F
With the exception of goldfish and koi, the majority of freshwater aquarium fish come from tropical to sub-tropical regions of the world. Depending on where they come from, freshwater aquarium fish will require different water parameters. Size and temperament can vary considerably between fish as well, even between fish found in the same part of the world. See the listing at the end of this care sheet to guide your choice and combination of fish for your aquarium. Many commonly kept species are now bred in captivity while others are still wild caught. To help reduce the number of fish collected from the wild, try to buy captive bred fish whenever possible.
Freshwater aquarium fish come in a variety of shapes, sizes, and colors. They all share basic physical characteristics such as gills used for breathing, a lateral line organ on their side to sense vibrations (look closely!), and fins for moving around their environment.
NORMAL BEHAVIOR & INTERACTION:
Most fish are diurnal, or most active during