Swimmers at the pool on Saturday were starting their laps when someone noticed they were sharing the pool with a large number of baby crocodiles.

They weren't threatening to take a bite out of anyone - they were baby freshies and they ranged in size from 20 to 50cm.

The swimmers took the intruders in their stride, remaining calm and exiting the pool as management assessed the situation.

Mount Isa City Council dubbed the crocs as the "six surprise scaly visitors" on its social media post however the pool manager has since confirmed to the North West Star there were in fact eight crocs in total.

All eight were safely captured and released back into Lake Moondarra, 15km away.

However the mystery remains how they got to the pool in the first place, presumably put there sometime overnight on Friday.

Pool manager Shae Donovan said they came into work on Saturday morning and the crocs were there.

"We didn't see them at first, they must have been hiding," Ms Donovan said.

"They were spotted when people started swimming."

There followed a difficult exercise to get the slippery crocs out using buckets and scoops.

"They (the baby crocs) were really scared, unfortunately," Ms Donovan said.

"The partner of one of our clients came down with a net, and we got them out with that in the end."

Whoever put them there was committing several offences.

As well as illegal entry to the pool, taking a freshwater croc from the wild can attract a fine of more than $5000.

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