Orange County - San Mateo Point

Restoration Project

Orange County - San Mateo Point

Restoration Objective:

Researchers developed a number of aquacultural techniques for Macrocystis cultivation in order to reverse trends of deterioration

Site Selection Criteria:

A site was selected with historical kelp beds that have declined.

Key Reasons For Decline:


Scientific Paper

Aquacultural Techniques for Creating and Restoring Beds of Giant Kelp, Macrocystis spp

W.J. North
Journal of the Fisheries Board of Canada, Vol. 33.


Site Observations:

Observation Date

1st Apr 1973 – 27th Apr 1974

Action Summary:

Four techniques were employed to rehabilitate Macrocystis beds: 1) removing grazing invertebrates and fishes. 2) transplanting adult Macrocystis plants by threading lines through the holdfast, prying plants loose, avoiding desiccation during transport and restoring the anchorage at the new location. A small buoy is usually placed directly beneath the holdfast to prevent abrasion against the bottom. 3) Juvenile Macrocystis plants can be gathered in the field or cultured in the laboratory on plastic rings and moved to desirable sites in the ocean. The juveniles can be attached by fastening them with rubber bands to projections on the bottom. 4) Mass cultures can be initiated from Macrocystis spores on strips of polyethylene film.

Project Outcomes:

Slight expansion of the San Mateo bed occurred during 1973-1974.

Key Reasons For Decline:


Area of Restoration (Ha)


Indicator Data:


Ending Value:

Starting Value:


Transplant Info: