Lifespan of a Ryukin Goldfish

The ryukin goldfish, commonly referred to as a fantail goldfish, is frequently confused with koi because of its long, elaborate tail and brightly colored body. You can differentiate between ryukin goldfish and koi and other goldfish by the hump on top of the ryukin's body and by the three to four lobes on the caudal fin. Unlike other goldfish species, ryukins can live several years in captivity if they receive proper care.

  1. Egg Phase

    • Like all goldfish, ryukin goldfish begin as eggs. Eggs are a semi-transparent color and fish eyes are often visible through the eggs. They typically hatch in about five days. Adult goldfish frequently eat fish eggs.

    Fish Fry

    • Baby goldfish are referred to as fry. They look distinctly different from adults. The fry resemble tadpoles. They often spend the first few days of their lives attached to plants before they begin to swim on their own. Depending upon aquarium temperature and size, the fry period can last anywhere from a few weeks to a few months.

    Adult Ryukins

    • Ryukin goldfish spend most of their life cycle as adults. They grow rapidly in the first months of life, then their growth slows down. They can grow 5 to 10 inches in length and, with proper care, can live 10 years or more. Adult ryukin require at least a tank of at least 20 gallons of water to remain healthy and need more space when multiple fish are housed together.

    Extending Life Span

    • To ensure a long and healthy life for your goldfish, it's vital to maintain clear, healthy water. The water's pH should be at or near 7, and water temperature should be between 65 and 75 degrees Fahrenheit. Goldfish are prone to swim bladder problems because of their deep bodies; goldfish that appear to be floating or swimming with their heads face down may have swim bladder conditions and risk a significantly shorter life span. Change 10 percent to 15 percent of your goldfish's tank water each week. Use a good filtration system to keep the water clean and an air stone to keep the water aerated.