Fishing Port Douglas owner Lynton Heffer has been fishing in North Queensland for 22 years and said crocodile behaviour had changed, particularly over the past two years.
"In the past couple of years we've certainly seen them more frequently in the more public areas," he said. "I don't think they're scared of human activity anymore and they're encroaching on areas they haven't been in the past.
"It's not behaviour you'd usually see."
Ian Jenkins, who owns Snakes Downunder Reptile Park and Zoo near Childers, said the crocodile population was spreading out.
"I think the likelihood of crocs moving further south than they traditionally have been is going to keep increasing," he said. "They don't read maps and they can travel considerable distances.
"I think crocs are looking to expand their territory so they are moving further afield and moving into areas they're not traditionally known to be."
Both Mr Jenkins and Mr Heffer were sceptical of calls for a cull saying it would create complacency and would never guarantee complete safety in waterways.
Cairns was the most common area for croc sightings so far this year with 108 reports, followed by the Cassowary Coast 66, Townsville 61 and Douglas 50.
Brenton Gangemi, who runs Snapping Tours on the Johnstone River at Innisfail, said he generally saw four to five crocodiles on each tour.
"I don't necessarily think there's an increase in crocodile numbers but there are certainly more people around to see them," he said. "There are always going to be crocodiles so people just need to be vigilant.
"Even if you cull the crocs, you've still got bull sharks and stingers to contend with."
Mount Isa MP Robbie Katter is leading the push to introduce controlled culls and legalise crocodile egg harvesting.
"It appears the crocs are not only growing in numbers but everyone here would agree they're much bolder and not scared of human presence," he said. "Undeniably there must be greater numbers because there are crocs in the river systems where we swim, pushing up into areas where they've never been in modern memory."
Shadow environment minister Christian Rowan said problem crocodiles would be shot on sight under the LNP's proposed crocodile management policy, with zones drawn up to decide the appropriate action but his government did not support a cull.
"From anecdotal reports there seems to have been a significant increase (in sightings)," he said.
"Absolutely it's a significant issue in the North and it will be a significant election issue."
The State Government is undertaking a $2.7 million, three-year crocodile population survey and monitoring program to track croc numbers.
Environment Minister Steven Miles said targeted crocodile operations had doubled under the Labor Government.
"We have made the wildlife officers, who do a very difficult and sometimes unsafe job, permanent," he said. "They were temporary officers under the (previous government)."
An EHP spokesman stressed increased sightings were not necessarily due to a population increase and could be attributed to multiple sightings of one animal or could be a case of mistaken identity.
