i want to know if puffer fish can eat salt from fish for example fish that come from sea?

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Salt dissolves in water…
If anything, they’d drink it.

And what would be the point? They aren’t built for eating it (unless you’re talking about saltwater pufferfish, but even then their natural diet doesn’t include eating salt anyway). Frankly, most puffers are such picky eaters that you’d be lucky to get them eating frozen food before you even consider feeding them rocks.

Most animals really shouldn’t be given extra salt. Any required salt comes from their normal diet and any excess can be deadly.

You’ve posted similar questions many times with little information to go off of, so it’s hard to help without knowing any of the details. So short answer: no, you should not be giving any of your fish salt to eat.
 
I think the question is...

Can I use salt water fish as feeder fish for my fresh water puffer fish?

To which the answer is yes. But...

If you are catching these feeder fish in the wild and bringing them into your home aquarium, I'd advise against it. It's just generally a bad idea to do that.

I used to keep a small salt water system just for breeding bugs to feed my fresh water fish. I did it for a couple of years and never had any issues doing so. That said, I also didn't do a whole lot of research to verify it was an scientifically safe according to the experts. I may have just gotten lucky. *Note: I have no idea what "bugs" I had. A friend had a very mature sump on a large salt tank and gave me gunk out of his sump that was crawling with "bugs".
 
Depends on the puffer species. The piscivore or partly piscivore species can eat sea fish. But it shouldn't be their only diet and the sea fish should not be too fatty and not contain much Thiaminase.
 
Ok im going to ask the same question again, not sure if its ragebait or not but here we go:

Why are you so obsessed with giving pufferfish extra salt?
 
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