A mystical underwater phenomenon not observed since 2001 is happening right now in New Zealand. Large numbers of female short-tailed stingrays have stacked in Northern Arch at the Poor Knights Islands.
This shaggy-do purple nudibranch called Jason mirabilis is a real beauty, and remarkably it's only found in New Zealand.
Clown nudibranchs are the most commonly spotted sea slugs in north eastern New Zealand.
Triplefin spawning season
June to August is winter in New Zealand and is the period of peak activity for some spawning triplefins.
It's a mystery how they synchronise... when the phase of moon and tides align New Zealand's jewel anemones explode in a mass spawning event.
Male jewel anemones
In the New Zealand winter jewel anemones swell with eggs and sperm in the lead up to a mass spawning event.
Demoiselle nest site
During the summer spawning season male Demoiselles hug the rock, protecting their nest site and its silvery patch of eggs.
Clown nudibranchs (Ceratosoma amoenum) are one of the most common nudibranchs on the east coast of the far north of New Zealand. Individuals come together to copulate and may even form groups.
Like most sea slugs, Elysia sp. sap-suckers are hermaphrodites. The reproductive genital openings are found on the right side of the body in the neck area. The slugs coil together in a head to tail position to line up their genital papillae for copulation.
Have you seen this undescribed Trinchesia nudibranch?
Taken on a night dive in Blue Maomao Arch at the Poor Knights Islands in New Zealand, these photographs have been reviewed by mollusc expert Dr Willan and this nudibranch is an undescribed species of Trinchesia - a new species to science.
Two individuals were discovered at a depth of about eight metres and appeared to be spawning, laying down a white egg coil. The specimens were approximately 30 millimetres long. Have you seen this nudibranch? Please email Alison@InspiredToDive.com.