Possibly over 25 years, it all really just depends on how well you take care of it and its own genetics.
Depends on what type of fish it is. Some fish can live up to 20 years!!!!
None. All fish need proper filtration and roomOnly some need large tanks and filters, The betta can live in a classic bowl. In a place where this is moderate light and they dont keed filters but...
5-7 years.
A healthy rainbow fish can live from about six to nine years. Though if it has some sort of a disease, it will have a shorter life.
The life span is 2 to 5 years