Indeed. Also, tossing it in a bag of holding might be a little tricky, because you're not getting that thing back out of there...
That's literally what I was about to say. Brilliant move.
Spoke to someone who knows the lore a bit better than myself, and bags of holding can be left easily by any sentient thing inside. However, teleporting or tossing the fish into lava... pretty much an instant kill.
Living things can't survive in there though. A dragon is considered living.
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