The Devonian Period
At the age of nine months
depends on what fish you have.
You Can Fish At Any Age
Umpa lupa fish
the same way they fish now!
their teeth
500
they mate at the age of nine months
It helps fish age faster than others.
When you hold the fish it will say what kind its status(which will say pregnant) and age
Not only can they behave differently, they can look different too. Some fish will move more slowly, some fish may appear to be "resting" more often. Some fish colors become more vivid with age, some fade with age. Some loose their markings with age, and others develop other markings as they age. So it's not really easy to answer that question when talking about all fish. When talking about a specific fish it's easier to answer.
Depends on their age