At what age are vertebrae and rib numbers decided?

Andrew Leslie Saul s883730 at
Tue Jun 13 02:32:48 EST 1995

Can someone provide a reference as to the age of a fish when rib numbers 
and vertebral numbers are determined?  ie. when environmental 
factors such as temperature cannot increase or decrease the number of these two 

Andrew Saul
s883730 at

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