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.
Report Abuse. 1  The actual life span of goldfish was recorded 45 yrs old if they have been kept in proper conditions such as big fish tanks. Goldfish is reaallly a good choice for pet. 2  Actually, the average lifespan of a goldfish is about 15-20 years. 7 years is under care, but not the greatest. Most dont even make it to a year because people are idiots.