There's not really an average weight for these guys because there are a lot of different things to consider: hatch weight, how quickly they began feeding, how often they are fed, how large of meals they eat, etc...
The most important thing to consider is their overall body shape - if they look healthy, then don't worry too much about what the gram scale says.
FWIW, I've had yearlings weigh anywhere between 400 grams and 1600 grams.
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