The 3.78 metre adult male saltie was pulled from the permanent First Gorge trap in the Katherine River on Friday afternoon, after an even bigger crocodile was found in the gorge last Monday.

The recent rain that inundated the Katherine River, pushing it to a high of almost 16 metres has opened the floodgates for crocodiles following two consecutive poor wet seasons.

Nitmiluk senior wildlife ranger John Burke said the team were "expecting to catch something" but it is very rare to find two saltwater crocodiles in the Katherine River in the same week.

Mr Burke said the crocodile was "quite a healthy animal" and likely came from the Daly River system along with the first saltie found on Monday.

"I think he was just enjoying a personalised tour of the Katherine River."

The two croc discoveries in less than a week reinforces the need to stay "Crocwise", according to Mr Burke.

"Please stay vigilant around isolated bodies of water... and look after your mates," Mr Burke said.

While they were big enough to eat a person, the two crocodiles caught last week pale in comparison to the the 4.4m, 350-kilogram saltwater croc hauled from Flora River Nature Park last year in August.

He said rangers caught 12 crocodiles in the region last year, although up to 23 have been trapped in recent years, and those high numbers could easily be reached in 2021 due to the high river levels.

"We're expecting to find more crocodiles in the Katherine River systems.

"The rise in river heights allow them to move around freely."

Mr Burke said the crocodiles they trap in the Katherine management zone are relocated, with this particular animal being taken to Darwin.

"Nine times out of ten they are removed and taken to a croc park," he said.

"This one actually ended up with a local person and they were going to move it on up north."

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