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Best places to dive with Giant Australian cuttlefish

Sepia apama

The largest cuttlefish species forms its only known dense breeding aggregation near Whyalla. Numbers vary sharply between years and triggered a temporary 2026 protection closure.

Destinations ranked by how reliably giant australian cuttlefish is seen. The bars show the likelihood by month — never a guarantee. See the full species page for more.

Whyalla & Cuttlefish Coast, Australia

Sighting likelihood by month
Month	Likelihood
January	not seen
February	not seen
March	not seen
April	not seen
May	occasional
June	peak season
July	peak season
August	occasional
September	not seen
October	not seen
November	not seen
December	not seen

Normal aggregation calendar; access is currently prohibited in the core site.

Fleurieu Peninsula, Australia

Sighting likelihood by month
Month	Likelihood
January	occasional
February	occasional
March	occasional
April	occasional
May	occasional
June	occasional
July	occasional
August	occasional
September	occasional
October	occasional
November	occasional
December	occasional

Possible year-round; no unsupported peak is applied.

Sydney, Australia

Sighting likelihood by month
Month	Likelihood
January	occasional
February	occasional
March	occasional
April	occasional
May	occasional
June	occasional
July	occasional
August	occasional
September	occasional
October	occasional
November	occasional
December	occasional

Possible year-round; no unsupported peak is applied.

Tasmania — East & Southeast, Australia

Sighting likelihood by month
Month	Likelihood
January	occasional
February	occasional
March	occasional
April	occasional
May	occasional
June	occasional
July	occasional
August	occasional
September	occasional
October	occasional
November	occasional
December	occasional

Possible year-round; no unsupported peak is applied.