Crayfish Bay

Crayfish Bay lives up to its name as one of the premier dive sites in the Mercury Islands group off New Zealand's Coromandel Peninsula, reaching 30 meters in waters where the iconic New Zealand crayfish, or rock lobster, thrives in numbers that demonstrate the difference healthy populations make to a marine environment. This intermediate site delivers the crayfish encounters that are among the most coveted experiences in New Zealand diving. The bay provides a naturally sheltered diving environment around Great Mercury Island, where volcanic rock formations create the complex habitat that crayfish require. The rocky walls, boulders, and reef structures are riddled with the crevices, overhangs, and caves that crayfish use as daytime shelter, and the density of suitable habitat at Crayfish Bay supports a population that is remarkable in both numbers and individual size. Divers regularly encounter crayfish whose long, waving antennae signal their presence from sheltered positions within the reef. Beyond the headline crayfish encounters, the bay supports a thriving marine community typical of New Zealand's warm temperate waters. Snapper are present in good numbers and impressive sizes, their golden-pink coloring and confident behavior making them constant companions during dives. Blue maomao and sweep form schools around the rocky formations, while demoiselles dart among the boulders in their territory-defending routines. Moray eels peer from their holes in the characteristic New Zealand species that is distinctly different from tropical morays. The volcanic rock substrate is covered with the diverse encrusting community that makes New Zealand wall diving so visually rewarding. Jewel anemones create patches of intense color, sponges in yellows, oranges, and purples add their own chromatic contributions, and the various colonial organisms create textures that give every meter of wall its own character. Kelp forests in the shallower sections add movement and the distinctive ambiance of temperate underwater forests. The intermediate rating reflects the bay's more sheltered conditions compared to the exposed outer walls of the Mercury Islands, though the 30-meter depth requires competent dive planning and management. The boat journey from the Coromandel coast adds an expedition quality to the diving experience. Crayfish Bay delivers what every New Zealand diver dreams of: face-to-face encounters with healthy populations of the country's most iconic marine crustacean, set against the dramatic volcanic backdrop of one of the Hauraki Gulf's most spectacular island groups.