The ocean has its own calendar. Whale sharks aggregate near plankton blooms, manta rays visit cleaning stations at predictable times of year, sea turtles nest on specific beaches during defined seasons, and coral mass spawning turns the reef into a blizzard of eggs and sperm. Planning your dives around these events turns a great dive trip into an extraordinary one.
Seasonal Wildlife Calendar
| Species / Event | Peak Season | Best Locations | Responsible Viewing Distance |
|---|---|---|---|
| Whale shark | Mar–May (Indo-Pacific), Jun–Sep (Mesoamerican Reef) | Ningaloo Reef (AU), Isla Holbox (MX), Mafia Island (TZ) | 3 m minimum; no touching |
| Manta ray (reef) | Year-round at cleaning stations; peak varies by region | Komodo (ID), Hanifaru Bay (MV), Isla de la Plata (EC) | 3 m; never position above |
| Hammerhead shark aggregation | Jun–Oct (eastern Pacific) | Cocos Island (CR), Galapagos (EC), Malpelo (CO) | 5 m; no flash photography |
| Sea turtle nesting | May–Oct (varies by species) | Great Barrier Reef (AU), Sipadan (MY), Oman Coast | Do not approach nesting females on beach |
| Coral mass spawning | Oct–Nov (GBR, 3–6 nights after full moon) | Great Barrier Reef (AU), Red Sea, Caribbean | Observe only; no bright lights |
| Sardine Run | May–Jul | Wild Coast, South Africa | Stay with guide; fast-moving predator activity |
Responsible Wildlife Encounter Guidelines
Seasonal aggregations draw large numbers of divers. Follow these principles to ensure the encounter is positive for both you and the wildlife:
- Never chase, intercept, or cut off an animal's path. Let wildlife come to you or pass at their own pace.
- Do not use flash photography for whale sharks, mantas, or at coral spawning events. Use video lights with red filters if filming.
- Limit group sizes. Dive operators at sensitive aggregation sites should cap groups at 4–6 divers maximum.
- Report unusual observations — large aggregations, entanglements, or bleaching events — to the local MPA manager or citizen science programs.