Where to see Giant Australian Cuttlefish Aggregation in 2026
Giant Australian cuttlefish · Sepia apama
Annual breeding aggregation of giant cuttlefish in the shallow waters of upper Spencer Gulf, with elaborate male display and mating behavior.
Best months
Difficulty & experience
Open Water; shore-entry, cold-water, and dry/thick-suit comfort. Many divers do this as snorkel.
Plan a trip
Methodology
How we picked these locations
We use the sighting-occurrence-cluster methodology: encounter regions are ranked from primary to closed based on documented occurrence records, operator continuity, and regulator permit status. We never publish per-trip sighting probabilities — “best” here means the most reliably documented region for this encounter, not a guarantee.
We aggregate confirmed occurrence records from GBIF and OBIS within a fixed radius of each dive site. Occurrence records confirm presence and reveal seasonality clustering, but they DO NOT measure per-dive probability — there is no eligible-effort denominator. We deliberately do not publish a numeric '% chance of sighting' from this data.
Numbers fluctuate; not a precise per-dive probability.