You need to give more details, like tank setup, parameters, how many you are keeping together, food etc. before someone can actually diagnose your problem.
All of the captive marble salamanders I normally see are usually obese so a three week fast is not out of the ordinary. These salamanders have slow metabolisms and are often overfed when kept at cooler temps. I don't have my conversion calculater handy but the ones at work continue to move and feed below 40 F (I just haven't measure how low exactly) When they get that cold sort of feed them when I remember and they still get obese.
Check out the care sheet on marbles caudata care which tells you how many crickets/week a marble salamander needs at different temps.
If you are using an acidic substrate such as sphagnum moss thus can cause a salamander to stop feeding and eventually die so substrate is important.
Just some thoughts
Ed
yes, it always higing in the substrate, and not active, and he is not too skinny. now, i try to leave the crickets for him to hunt by himself, i wish he can eat by this way...... /. .\
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