Fast growth:
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Fast forward the time on your iPod or iPhone. Switch it back to the
correct time and your fish will be all grown up, depending on how
far ahead in time you went.

Get your fish grown fast:
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First you go to you fish game and make the time normal. . . Then you make
all of your fish pregnant and then feed them cuz they might die of
starvation and then you go and change the time two or three hours ahead
and then your fish will have had babies and grown. But make sure you
feed them cuz they will die. then change your time back when you are done.