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Fernando,

As several colleagues stated, juvenile is a term used to define a
ontogentic stage, where fish have reached their adult morphology
(although the proportions may still change), e.g. the fish has left the
larval stages.
Immature refers to a fish, which has not yet reached the reprodutive
stage. I don't think it can be applied to fish outside the reprodutive
season, e.g. cyprinids in winter without ripe gonads are not "immature".

best wishes
Irene -------------------------------------------------------
Dr. Irene Zweimüller       phone:  ++43 1 4277 54343
Inst. f. Ecology and       FAX:    ++43 1 4277 9542
Nature Conservation
Dept. Limnology    e-mail: [log in to unmask]
Althanstr. 14
A-1090 Vienna
Austria - Europe
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