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Koi live an average of 50 to 70 years, but can live over 200 years. The oldest koi on record is Hanako, a scarlet koi that died in 1977 at the age of 226.


Koi eggs hatch about three days after females lay them; in colder temperatures, the time can be as long as four days. They are laid in clutches that average 30,000 eggs, after which they are fertilized externally by the males.


Koi can be kept in aquariums, but this isn't healthy for the fish if the aquarium isn't proportionate to their body size. Most adult koi live in outdoor ponds to accommodate their large size.


How long a fish can live out of water depends on the species of fish, as some fish can survive for up to a few days while others can only survive for minutes. The fish that can survive for a few days without water do so by breathing the air or by absorbing it through sk...


The average life expectancy of a domestic, indoor cat is 15 years, though cats commonly reach 18 to 20 years old. Feral, outdoor cats have an average life expectancy of approximately six years.


Dogs can become dehydrated within a few hours in hot summer weather, says veterinarian Cynthia Otto, DVM, PhD. In the case of extremely hot weather, older dogs, those with heavy coats and those suffering severe dehydration can die in less than a day.


When kept in captivity, goldfish live anywhere from a few months to 45 years depending on the size of their habitat and how well they are cared for. Goldfish kept in bowls have the shortest lifespan; with proper cleaning and feeding, they can survive for about five year...