Department of Energy Argonne National Laboratory Office of Science NEWTON's Homepage NEWTON's Homepage
NEWTON, Ask A Scientist!
NEWTON Home Page NEWTON Teachers Visit Our Archives Ask A Question How To Ask A Question Question of the Week Our Expert Scientists Volunteer at NEWTON! Frequently Asked Questions Referencing NEWTON About NEWTON About Ask A Scientist Education At Argonne Age of Fish
Name: Phillip E
Status: student
Age: 13
Location: N/A
Country: N/A
Date: 2001

How can you determine the age of a fish? I know that there are many types of fish, so if you need a specific one you can pick from any of the sports fishing fish - trout, bass, northern pike, salmon.

I am not sure about this, but I thought I heard once that fish scales have rings similar to tree rings and you can tell the age of the fish by the number of rings on their scales. I am also not sure if this applies to all fish species.


In most bony fishes, many of the scales and bones show seasonal growth (more obvious in the temperate zones)that can be observed. Since most bony fish never stop growing (some notable exceptions here, scientist have a means to determine age.

Steve Sample

Click here to return to the Zoology Archives

NEWTON is an electronic community for Science, Math, and Computer Science K-12 Educators, sponsored and operated by Argonne National Laboratory's Educational Programs, Andrew Skipor, Ph.D., Head of Educational Programs.

For assistance with NEWTON contact a System Operator (, or at Argonne's Educational Programs

Educational Programs
Building 360
9700 S. Cass Ave.
Argonne, Illinois
60439-4845, USA
Update: June 2012
Weclome To Newton

Argonne National Laboratory