Meet the site
Stragglers Rocks are the closest offshore reef to Fremantle: a group of visible rocks with limestone reef around them, about 4 nautical miles west of the harbour entrance. They mark the edge of the Five Fathom Bank between Fremantle and Rottnest and are surrounded by wrecks, including the Ulidia inside the reef, two scuttled dredges to the west and the Zedora on the Mewstones to the south.
The Marine Life Network describes depths from the shallows to 12 m, with the best diving on the exposed seaward side, and notes that the reef is often used as a second dive. The limestone is covered in kelp and red algae, with ledges, gutters and overhangs. Buffalo bream, sweep, wrasse, herring cale, leatherjackets and bullseyes are common, western rock lobster live in the crevices, and wobbegongs rest under ledges. Visibility is usually better than inshore sites.
The reef needs calm weather, but its short distance from the ramps makes it useful when Rottnest is too rough or time is short. It suits Open Water divers from boats and can be combined with any of the nearby wrecks for a two-dive morning.
Detailed site information is limited, so this is a general record for the reef. Check the chart for the rocks and breaking water, and anchor well clear.
Because the reef is close to the busy route between Fremantle and Rottnest, fly the dive flag, keep a lookout on the boat and use a surface marker buoy when ascending away from the anchor. The reef is at its best after several days of easterly weather, when visibility can exceed 10 m.
Research this site before booking Stored site notes may be historical. These questions highlight gaps without turning old instructions into a current dive plan.
Straggler Rocks Reef is recorded as Reef in Perth. The listed access is boat. Confirm the actual meeting point, route and permission to visit; a map pin does not establish any of these.
Topics flagged by the stored research
These are questions prompted by the existing notes, not a verified or complete hazard assessment.
- Other water users
- Ask about vessel activity, exclusion areas and the agreed surface arrangements.
- Water movement
- Ask how swell and local exposure affect the proposed entry, exit and route.
Historical access notes exist for this record, but have not been independently verified for current use. Request current directions from the operator or site manager rather than following an old entry description.
Questions, answered
Is Straggler Rocks Reef suitable for my certification?
The record lists Open Water. That does not establish suitability for every route or day. Share your training, recent experience and equipment needs with the operator and ask about the specific proposed dive.
Can I book Straggler Rocks Reef through YouDive?
YouDive is an independent research directory. Contact an operator directly to confirm whether it currently runs the trip, the inclusions and the booking terms.
What you might see
Buffalo bream, sweep, wrasse, herring cale, leatherjackets, bullseyes, western rock lobster, wobbegongs, kelp
Location
Visible rocks and surrounding limestone reef about 4 nautical miles west of Fremantle, the closest offshore reef to the Fremantle ramps.
Facilities nearby
Woodman Point, Leeuwin and Fremantle boat ramps.
Before you make plans
Conditions, access and operator schedules can change. This is a location guide, not a dive plan. Ask a local operator about current conditions and suitability for your training and experience.
Sources & further reading
marinelife.org.audivingwawrecks.comRecord updated 26 Sept 2026. Source claims are being reviewed.
