An Australian zookeeper urged people to catch and donate deadly funnel-web spiders, to help replenish stocks of antidote running low after a spate of spider bites.

The Australian Reptile Park, the country's sole supplier of funnel-web venom to antidote producers since 1981, relies on the public to hand in spiders that are milked for the venom used to produce an antidote.

The anti-venom program was now at risk after too few spiders were donated last year and a recent heatwave encouraged more spider activity and bites, the park's general manager, Tim Faulkner, said.

"We rely on community support to keep this program alive," Faulkner said. "We have tried to catch enough spiders ourselves and we just can't."

We have tried to catch enough spiders ourselves and we just can't

Funnel-web spiders live throughout southeastern Australia, but the only known killer is the Sydney funnel-web spider, found in the Sydney region and as far north as Newcastle and south to Illawarra, the park says.

"The large fangs and acidic venom make the bite very painful," it said, noting that a major bite can cause death within an hour if left untreated.

Australia has had two funnel-web spider attacks in two weeks, one of them involving a woman bitten by a spider while she was asleep. Despite the terrifying reputation of Australian wildlife, nobody has died from the bite of a funnel-web spider since the anti-venom program began in 1981.

Catching venomous spiders is safe, as long precautions are followed, Faulkner said. "With an appropriate jar and a wooden spoon, you can flick the spider into the jar so easily," he said.

"We've been doing this for 35 years and no one's been hurt."