Sixty-pound cinder blocks placed in the ocean for a canoe regatta caused a range of damage to approximately 50-60 coral colonies in Kailua Bay.

Two dive teams, from the DLNR Division of Aquatic Resources (DAR), spent Tuesday documenting and photographing damage. The Founders Regatta, put on by the Keauhou Canoe Club, was paused on Saturday when it was discovered that 16 of 28 cinder blocks had been dropped on top of live coral. Racing was allowed to resume after officers from the DLNR Division of Conservation and Resources Enforcement (DOCARE) did initial dives to photograph the blocks and GPS their locations for the DAR assessment.

As of Tuesday, all but three of the blocks had been relocated to sandy areas. Those three blocks are located on mostly dead coral rubble.

In a press release DAR West Hawai‘i Aquatic Biologist Chris Teague, who led the dive teams, said “From what I’ve learned, the canoe races have been using existing block moorings to hold lane flagging for the past 40 to 50 years. The new ones that were placed for this racing season are the ones that are causing damage and are the ones we are concerned about.”

Teague estimates that damage to individual colonies ranges from 5%-100%, where coral fingers were broken off of the colony. Overall, it is certainly less than prior reef damage caused by grounded vessels or boats that have broken loose from their moorings. Hawaiian corals grow extremely slow; therefore, it could take 1-2 years for the corals to re-grow. Fortunately, the colonies are still intact to recover from the damage.

The dive team’s findings will be compiled into a written report that will be reviewed by DAR leadership, which will then decide whether to submit an action to the Board of Land and Natural Resources.

Long-term, DLNR plans to work with canoe racing associations on the possibility of installing permanent mooring pins of some sort in race lanes that do not impact coral reefs.

 

DLNR Photo