Where and when to see groupers and giant sea bass

Goliath and Nassau groupers, Great Barrier Reef potato cod and California’s giant sea bass offer different encounters. Choose your target animal first, then use the site recommendations and individual calendars to plan the trip.

This guide documents sightings in 8 Good Dives regions.

Colored-pencil illustration: one Nassau grouper (Epinephelus striatus).

Where to plan your trip

Our picks for a trip focused on groupers and giant sea bass, chosen for the encounters below. Calendar peaks describe timing, not a ranking of destinations.

Potato cod at a named site
Scuba diving
Northern GBR & Coral Sea
Cod Hole on the Ribbon Reefs is a specific target for large potato cod. Plan an itinerary that actually reaches this northern site.
Target: potato cod
Ask about: Cod Hole
Sources
- Cod Hole potato cod (Tourism and Events Queensland)
Goliath grouper on a wreck dive
Scuba diving
Florida Keys
The Adolphus Busch wreck has documented goliath grouper encounters. Ask about recent sightings and choose the dive for your depth experience; the main deck is around 27 m.
Target: goliath grouper
Ask about: Adolphus Busch Sr. wreck
Sources
- Adolphus Busch wreck and goliath grouper (Florida Keys tourism)
California giant sea bass
Scuba diving
Channel Islands (California)
Catalina offers a different target from tropical groupers: giant sea bass. Summer aggregation opportunities are seasonal, so check local sightings before arranging the trip.
Target: giant sea bass
Ask about: Catalina Island reefs
Sources
- Diving with giant black seabass in Southern California (California Diver)
- Giant sea bass (Aquarium of the Pacific)

Groupers and giant sea bass sighting calendar

Calendar months, every year

Regional overview rows show presence. The animal rows below each region show their individual peak months.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Northern GBR & Coral SeaAustralia	●	●	●	●	●	●	●	●	●	●	●	●
Northern GBR & Coral Sea: potato cod	●	●	●	●	●	●	●	●	●	●	●	●
Florida KeysUnited States	●	●	●	●	●	●	●	●	●	●	●	●
Florida Keys: goliath grouper	●	●	●	●	●	●	●	●	●	●	●	●
Channel Islands (California)United States	●	●	●	●	●	●	●	●	●	●	●	●
Channel Islands (California): giant sea bass	●	●	●	●	●	Peak	Peak	Peak	Peak	●	●	●
Cayman IslandsCayman Islands	●	●	●	●	●	●	●	●	●	●	●	●
Cayman Islands: nassau grouper	●	●	●	●	●	●	●	●	●	●	●	●
Jardines de la ReinaCuba	●	●	●	●	●	●	●	●	●	●	●	●
Jardines de la Reina: goliath grouper	●	●	●	●	●	●	●	●	●	●	●	●
Mafia IslandTanzania	●	●	●	●	●	●	●	●	●	●	●	●
Mafia Island: giant groupers	●	●	●	●	●	●	●	●	●	●	●	●
Malta & GozoMalta	●	●	●	●	●	●	●	●	●	●	●	●
Malta & Gozo: groupers	●	●	●	●	●	●	●	●	●	●	●	●
Rowley ShoalsAustralia	●	●	●	●	●	●	●	●	●	●	●	●
Rowley Shoals: potato cod	●	●	●	●	●	●	●	●	●	●	●	●

Peak = best odds · ● = regularly seen · blank = unlikely.

Calendars describe animal presence, not weather or site access; check each region’s dive season. For grouped animals, a marked month may apply to only one member of the group. Sightings vary by site and dive.

Where and when to see groupers and giant sea bass

Where to plan your trip

Groupers and giant sea bass sighting calendar

Explore all 8 documented regions