Queensland's dry, hot weather is doing nothing, absolutely nothing for the love lives of the state's crocodiles.

Crocodile farmer John Lever says the crocs mate once a year and depend on monsoon rains - due around now."But with the dry, dry weather we've been having, there's no stimulus at all ... The crocs are all sort of lying about in anticipatory glory, they've gone off their food and they're listless, some of the males are a bit tetchy and we're all getting a bit anxious," he said.

He said the farm's "passion" indicator, a frolicksome female nicknamed "the old tart," was stirred only faintly by a recent thunderstorm.

"She's always the first one to be switched on ... but even she has hardly batted an eyelid," Lever said.

He said the croc exhibited some signs of arousal after the thunder and lightning, stretching her neck and blowing bubbles in the water, but she failed to draw any sign of interest from the males.

A heavy rain was needed, he said.

Otherwise, males could miss out on the female's peak once-a-year fertility period and the eggs would be sterile.

Like all farmers, he said, "we're really dependent on the weather."