Mix of schooling bony fishes in image but Subject=main presence of larger ones,which are I think S. bassensis,but not certain.More pics to follow.

The colour and long thin tentacles indicate O. kaurna, as did the burying technique when dropped into a pool (image #3)

Adult clingfish on belly of adult Magpie Perch which is posed for cleaning against an old jetty pile.

Juvenile Found under rocks at end of jetty in about 6m

male

Yellowback Threefin(female), Helcogramma deccurens, Edithburgh Jetty, Yorke Peninsula, South Australia.

Bottom centre

Older juvenile,during dive in swim enclosure beside jetty.

Very small juvenile in ~1 m depth,later in afternoon,in sandy detritus-filled hole in a rock channel.Fish's length is ~10-20 mm !

Depth 6 m,old jetty.

The only one I've seen while diving. Under Port Giles jetty on scuba, depth ~ 9m

Female resting on a Eleven Armed Sea Star.
This is a duplicate image, one for the fish, the other for the sea star.

doing his best to hide in the sand before i saw him

Juvenile, 1.5cm at 3m depth.

2cm

Low tide on intertidal rocky reef.

On inter-tidal reef at low tide.

Intertidal reef, Bagwash, Edithburgh, Yorke Peninsula.

Found under a small rock beneath old jetty.

Very young ... tiny.

On low tidal sand/mud.

In a shallow channel, so I got some good photos of the underside as well.

Mix of life under a turned inter-tidal granite rock but SUBJECT species is best seen(in 1st pic) atop the low ~ central black periwinkle(with others on rock surface @ lower L).

Meridiastra occidens. Name not available on iNaturalist.

Om inter-tidal reef at low tide.

SMITH BAY dive, via Emu Bay.

just a baby

A square fish. Under rock on inter-tidal reef at low tide.

I think the dark form of lineolatus and not I. cariosus

Small green/brown chiton

In rock pool at low tide on inter-tidal reef.

Guess on ID.
Found indoors during heat of summer. Released in nearby garden where it was a little more moist and cool.

Spot the difference. The first image is the subject gastropod. The second shows it alongside a didemnid ascidian, its food source.

Adult in ~0.7-1.0 m depth via snorkel early on rising pm tide

Courting pair,wonderful to observe in clear calm water a few metres off beach.

Collected for identification.