Marine Wildlife in Port Phillip Bay
The waters around the Mornington Peninsula are home to resident populations of bottlenose dolphins and Australian fur seals — the dolphins in Port Phillip Bay (one of the largest resident dolphin populations in a bay environment in the world, with an estimated 100–150 individuals), and the seals on the rocky platforms and haul-outs along the peninsula’s southern coast and around the offshore islands. A dolphin and seal tour takes visitors into the bay or along the coast by boat to observe these populations in their natural habitat.
Dolphin encounters — Port Phillip Bay’s bottlenose dolphins are reliably sighted year-round (the bay’s sheltered, food-rich waters support a resident population rather than a seasonal migration). Tours operate from Sorrento and Queenscliff, and some operators offer swim-with-dolphin experiences (snorkelling alongside wild dolphins in the bay — the dolphins approach voluntarily, and interaction depends on their behaviour on the day).
Seal encounters — the Australian fur seals haul out on rocky platforms along the peninsula’s ocean side and around the Heads (the entrance to Port Phillip Bay). Seal-watching tours approach these haul-outs by boat, and some operators offer snorkelling with the seals — the young seals are famously curious and playful in the water.
Frequently Asked Questions
What is the best time to see dolphins?
Year-round — the dolphins are a resident population. Calmer conditions (typically morning, and more common in the warmer months) improve sighting rates and comfort on the boat.
Can I swim with the dolphins?
Some operators offer swim-with-dolphin experiences (snorkelling alongside wild dolphins in Port Phillip Bay). The dolphins are wild and approach voluntarily — interaction is not guaranteed but sighting rates on these tours are high.
How long is a dolphin and seal tour?
Typically 2–4 hours, depending on the operator and the itinerary (dolphin-only, seal-only, or combined).