About 200 volunteers from across Australia took part in the whale count, which was organised by the Organisation for the Rescue and Research of Cetaceans. The organisation will use the data gathered on Sunday to track migrational whale movements.

Whale watchers were out in force at Cape Solander in Botany Bay National Park on the weekend, taking advantage of the clear skies and little or no wind.

Since the end of May, about 900 whales- mostly humpbacks- have been spotted off the coast of Kurnell, Macquarie University research student, Maryrose Gulesserian said.

Ms Gulesserian is in the third season of a whale study that aims to identify and assess the potential effects commercial and recreational vessels may have on the migratory east Australian population of humpbacks.

She conducts the land-based study from Cape Solander using a theodolite- an instrument that measures horizontal and vertical angles in triangulation networks- and tracking software.

"Recently we've had some beautiful days out here so it's been easy to spot them,'' Ms Gulesserian said.

"Everyday we've seen 30 plus whales, mostly humpbacks, some minkies and seals, dolphins.''

Bangor resident and professional whale watcher, Wayne Reynolds, said 900 whale sightings was "a pretty good figure''.

"We haven't seen those types of numbers since 2006,'' Mr Reynolds said.

"The weather was shocking last year so you just couldn't see them.''

Whales are easiest to spot when skies are clear are there is little or no wind. The whale watching season ends in August.

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