how long do comets live?

Comets can easily live for 20 years if properly taken care of. The average length for a comet is 18 inches. They can get bigger than that though.

Check out these sites: http://news.bbc.co.uk/2/hi/uk_news/england/devon/4...

http://www.ponddoc.com/WhatsUpDoc/Koi/fishfacts.ht...

http://www.vcnet.com/koi_net/hanako.html

Comets, being the next closest thing to what all goldfish are descended from aside from Koi, are very hardy. Generally 12 to 18 inches is their mature size. When I shut down my pond I found homes for 3 that were approximately 14 inches long aS well as larger Koi, all which were 6 years old. A good rule of thumb for these fish is this:

Kept in a bowl - approx. 30 days

In a tank - 3 to 5 years

Pond environment - 18 to 30 years

Of course, all this is related to how well they are kept and the quality of their water/nutrition.

Hope this helps.

The comets will live 10-15 years if well cared for.

Comets have a lifespan of approximately 7 to 14 years and thrive in temperatures close to freezing. They can grow to reach 12 inches in length.

they can live for several years and grow nearly a foot long if well cared for. The koi can live for what seems like forever.