The three types of symbiosis are... Mutualism: A relationship in which both species benefit. Commensalism: A relationship in which one species benefits and the other speci â¦ es is neither helped nor harmed.
Definition of goldfish. : a small usually golden-orange Asian cyprinid fish (Carassius auratus) often kept as an aquarium and pond fish.
People are usually surprised at both the normal life expectancy and size that goldfish reach. Goldfish Size and Life Expectancy. If kept in a suitable environment, single tail goldfish normally grow to 10 inches (25cm) and can sometimes reach 12 inches (30cm). Fancy goldfish normally grow to 8 inches (20cm). The normal life expectancy of a single tail goldfish is about 20 years. Fancy goldfish have a life expectancy of about 12 years.