Meet the site
Catch Bag Reef takes its name from a lost bag. According to the Scuba Doctor listing a well-known cray diver, transferring gear to the boat, dropped his catch bag – containing an exceptionally large crayfish – over the side on this reef, and the name stuck. The site is a flood-tide drift over kelp forest in the Lonsdale Bight between Point Lonsdale and Queenscliff, at 12–24 m, and it also works as a slack-water reef dive.
The bottom is 'large kelp fronds with broken sandstone reef' – ridges and slabs of limestone with Ecklonia and other kelps on top and ledges beneath, running east from the shallow end of Lonsdale Wall, which is only 200 m away. The drift covers a lot of it: at a knot of flood a group passes over several hundred metres of reef in a 40-minute dive, and the kelp opens and closes to show southern rock lobster and abalone in the ledges, leatherjackets and wrasse in the fronds, and, in summer, 'large schools of yellowtail kingfish', which the listing singles out and which follow the flood in through the Heads. Where the kelp thins the sponge gardens of the bight take over.
It is a less-known drift than Boarfish Reef Drift and is used by clubs and by charters looking for a change of ground, or as a second dive after the wall on the same slack-into-flood sequence: dive the wall on the flood slack, surface, and drift Catch Bag on the young flood. The kelp makes the safety stop interesting – it is possible to hang in the canopy at 5 m – but it also means keeping the float line clear of the fronds. Within the marine national park, the crayfish and abalone are now protected.
Research this site before booking Stored site notes may be historical. These questions highlight gaps without turning old instructions into a current dive plan.
Catch Bag Reef Drift is recorded as Drift in Port Phillip Heads. 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.
- Current and timing
- Ask how the operator assesses the current window for the actual route. Historical tide notes are not a departure instruction.
- Other water users
- Ask about vessel activity, exclusion areas and the agreed surface arrangements.
- Lines and obstructions
- Discuss any known entanglement concerns and the suitability of the planned area.
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 Catch Bag Reef Drift suitable for my certification?
The record lists Advanced 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 Catch Bag Reef Drift 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
Southern rock lobster, abalone, yellowtail kingfish (summer schools), leatherjackets, bluethroat wrasse, magpie perch, kelp (Ecklonia), sponge gardens
Location
Kelp-covered reef in Lonsdale Bight between Point Lonsdale and Queenscliff, 207 m east of Lonsdale Wall Shallow.
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
scubadoctor.com.auscubadoctor.com.auRecord updated 26 Sept 2026. Source claims are being reviewed.
