For a number of reasons. Usually, fright. Every Arowana has an individual personality, IMO. I keep community tanks, and I see the different personalities at work.....
If your aro keeps jumping, you might want to observe the times he jumps and the incident leading to the jump. I don't think anyone can give an accurate answer to your question, because it's an individual thing. Just observe and find the real reason for your aro to jump.
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