NSW wildlife officers have suspended until morning a bid to disentangle a whale calf seen dragging ropes and buoys as it swam with its mother off Sydney.
The pair were spotted in Sydney Harbour on Thursday afternoon, prompting a National Parks and Wildlife Service (NPWS) operation to free the calf.
A crew assessed the calf off Long Reef, on the city's northern beaches, but the presence of the protective mother and a third whale, along with fading light and approaching stormy weather, forced them to call a halt to the operation.
The whales are expected to head south along the coast on the annual humpback migration.
NPWS marine fauna program co-ordinator Geoff Ross told AAP the ropes tangled around the whale's flukes were not life threatening at this stage.
Disentanglement crews along the coast have been alerted to be ready for an intercept on Friday.
Mr Ross said the NPWS would be helped by the police air wing, other aircraft and whale spotters on the shore.
"We would hope to be able to mount a disentanglement operation as soon as we find out the location in the morning."
Mr Ross said disentanglement crews would likely use a technique employed by whalers in the past.
"That is to attach a length of 100-metre line on the existing entanglement and to that attach inflatable buoys.
"That slows the animal down and tires it out and allows our boat crews to approach, put cameras under the water and have a look at the entanglement."
Mr Ross said the crews could then pick which ropes needed to be cut off first to ensure they fell away safely from the animal.
Shona Lorigan from the Organisation for the Rescue and Research of Cetaceans of Australia (ORRCA) said the group's volunteers would be "on the headlands" along the coast early on Friday to spot the whales.
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