Messing around on the net and this is what I read. Does anyone already know this?

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So....I guess the point is whenever you catch a big crappie at 1 & 1/2 lbs or bigger then theyre already getting pretty close to the age of dying?!? So it sounds like instead of releasing all the big mamas to spawn, grow bigger, whatever we should actually keep those to clean and release more of the 10"-12" fish?!? My question is though.....how old is a crappie that makes it to 3 lb status??????