Dive-site story
Located off Warrnambool within the Merri Marine Sanctuary, Middle Island features shallow calcarenite limestone reefs dissected by swim-throughs, overhangs, and sandy gutters. Heavy kelp canopies dominate the rocky substrate, giving way to protected sandy pockets that shelter large rays and bottom-dwelling sharks. Conditions depend heavily on Southern Ocean swells, which can rapidly alter visibility and generate surge through the rocky channels.
Limestone ledges and swim-throughs covered in sponges and brown algae
Frequent encounters with resting smooth rays and southern fiddler rays along the sandy edges
Macro life including nudibranchs, abalone, and rock lobsters tucked into limestone crevices
Location
Use the map to plan with your operator and confirm the exact entry point on the day.
Seasonality
Summer and early autumn typically bring lighter winds, smaller swells, and warmer water.
Marine life
| Species | Likelihood | J | F | M | A | M | J | J | A | S | O | N | D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Smooth rayBathytoshia brevicaudata | Common | ||||||||||||
| Southern fiddler rayTrygonorrhina dumerilii | Common | ||||||||||||
| Port Jackson sharkHeterodontus portusjacksoni | Seasonal | ||||||||||||
| Weedy seadragonPhyllopteryx taeniolatus | Rare | ||||||||||||
| Southern rock lobsterJasus edwardsii | Common |
Marine forecast
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