Comet History
The Comet was developed in the United States around 1880 by Hugo Mulertt. It is a single-tail goldfish with elongated fins, faster and more athletic than the Common goldfish. Common color is solid bright orange.
Comets sold as feeder fish in pet stores are often poor quality and stressed. Buy from reputable breeders or pond suppliers for healthy stock.
Why Ponds Beat Tanks for Comets
Comets reach 25–30 cm at maturity. A pond gives them room to grow to full size, plus the natural temperature cycling and biological diversity that tanks cannot replicate.
Outdoor ponds in temperate climates need only 100 gallons minimum for 1–2 Comets, but 500+ gallons is much better. They live 15–25 years in good ponds.
Pond Setup Basics
Depth: at least 60 cm (2 ft) — deeper for cold climates so fish can overwinter below the freeze line. Filtration: pressure filter or bog filter rated for 4x pond volume/hour. UV sterilizer recommended to prevent algae blooms.
Plants: water lilies for shade, hornwort for oxygen, water hyacinth for nutrient uptake. Marginal plants (cattails, iris) for biological filtration.
Winter Care
In areas with frozen winters, ponds must be deep enough that the bottom remains liquid. Keep a hole open in the ice using a pond de-icer or bubbler — gas exchange must continue or fish suffocate.
Stop feeding when water drops below 10°C (50°F). Goldfish enter semi-dormancy and cannot digest food. Resume feeding gradually in spring as temperatures rise.
Pond Predators
Herons, raccoons, mink, and large birds are pond goldfish predators. Use netting, scarecrow sprinklers, or pond covers to deter them. Rocks and overhangs in the pond give fish places to hide.