Depends on what type of fish it is. Some fish can live up to 20 years!!!!
it differs when it comes to the species of fish.......obviously
4 years percicle it depeneds on the perpendicular angle of there spinal cord runing to there vertibrate.
3 years old(according to laoise)
where do jawless fish live and how long do they grow try to find the answer please because it is for a project that i am doing thanks Michaela:)