Know the Rules/Fishing Regulations/Marine Managed Areas/Hawai‘i Marine Life Conservation Districts/Waikīkī
Oʻahu - Waikīkī Marine Life Conservation District (MLCD)
The Waikīkī MLCD is located at the Diamond Head end of Waikīkī Beach, one of Hawai‘i’s most visited shorelines. Although the surrounding area is urban and heavily used, the MLCD protects a small but important nearshore marine ecosystem.
MLCD Boundaries
The Waikīkī MLCD extends:
- From the groin at the end of Kapahulu Avenue
- To the ‘ewa (west) wall of the Natatorium
- From the highwater mark seaward 500 yards or to the edge of the fringing reef—whichever extends farther
This nearshore zone protects a shallow reef flat, dredged channel, and the deeper drop-off along the reef’s outer edge.
Marine Environment
Reef Flat & Channel
A broad reef flat extends about 35 yards offshore from the Waikīkī Aquarium seawall to a dredged channel, then continues beyond it. Key features include:
- Shallow depths of less than 3–4 feet above much of the reef flat
- A channel approximately 8 feet deep
- Areas of higher fish abundance along:
- the shoreline side of the channel (with small caves)
- the Natatorium wall
- the exposed reef near the channel’s seaward side
The reef flat is primarily composed of coralline algae, rubble, and patches of live coral, with low bottom relief. Visibility is best when wave action is minimal, as sediment on the bottom easily becomes suspended in the water.
Outer Reef Edge
At the reef’s outer boundary, the seafloor drops sharply to 15–20 feet. Here, visitors find:
- Arches
- Crevices
- A higher concentration of fish
Because of the structure and depth change, this is one of the most ecologically active zones in the MLCD.
Safety Considerations
Summer swells often bring high surf to Waikīkī’s south-facing shoreline. Waves can be particularly hazardous along the outer reef, where shallow sections become exposed. Conditions change quickly and can catch swimmers off guard.
Lifeguards are on duty year-round at the Waikīkī end of the MLCD.
Facilities
- Restrooms
- Showers
- Snack bar
Regulations
Permitted Activities
- Possessing in the water:
- Any knife
- Shark billy
- Bang stick
- Powerhead
- CO₂ injector
- Conducting scientific or propagation activities with a valid permit
Prohibited Activities
- Fishing for, taking, or injuring any marine life, including eggs
- Possessing any gear in the water that could be used to take marine life
- Taking, altering, or possessing sand, coral, or any geological feature, including gear intended for these purposes
Want to learn more?
Explore Hawaiʻi’s Marine Managed Areas by island, including rules, boundaries, and stewardship details.
