I think I might have a couple.  I rescued them from a pet shop about 12 years ago and they were tiny.  They're on the verandah in a 3' tank which is full of green weed and algae and they live in the debris at the bottom of the tank.

They are disgusting and remind me of giant slugs.  These 2 are only about 12" long & maybe it's because their growth is restricted by the size of the tank.

It's probably too late to release them now - although I'd like to get rid of them.

When they're hungry they'll press up against the tank and stare at me.  On a couple of rare occasions I've seen them in tanks - but they always end up dying.  They must thrive in a murky environment.

The dead lungfish you found FD is probably someone's pet they've released into the river.

Sounds like a good idea.  If I could tolerate touching these revolting creatures - I'd let them go in a creek somewhere too.

Whatever you do, don't release them. Bury them in your backyard if you want to get rid of them, but kill them first. Or you could probably sell them to a zoo or something.

I doubt the one I saw was a pet.

Sorry, I meant 'googling' it, in case there was some wierd fish kill that only affected a few lungfish or something like that, and someone wanted to check if it was happening elsewhere.

Yes, it is because they are exotic. They could become a pest species if they were ever released. There would probably be some people interested in taking them off your hands, but you should make sure they are reputable and aren't going to stick them in a farm dam or backyard fish pond. Those fish would be more than capable of escaping.

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I reckon if you don't kill them first, they'd dig themselves out and come knocking on your door in the middle of the night saying "feed me".

I hear they'll eat dead rats and stuff and they'll dig themselves into the mud during the dry season, covering themselves with a mucus membrane until the rains come again. They sound like interesting fish.

Maybe you could sell them as exotic fish and get a good price for them if you don't want them.

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Yeah maybe.
But sometimes it's easier to sell something than give it away.
..Like the guy who put his discard wood pile on the naturestrip with a "free wood" sign. After 3 weeks it was still there so he put a sign up saying $5 per length, and it was gone the next day.

If you put them in a pond they could escape during rain and enter a local waterway to wreak ecological havoc.

When the river used to flood they would congregate below the wier and we could pick them up, briefly.