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YEAR 2010 - CRP Project #9007 (Gulf of Mexico)

Project #9007
Seagrass Restoration of Propeller Scars

Tampa, Florida

Example of a project location
Example of a project location

Project name:   Restore-A-Scar Seagrass Restoration of Propeller Scars  
Project number:   9007  
Project status:   In Progress  
Grant Administrator:   Gulf of Mexico Foundation (for NOAA)  
Grantee:   The Ocean Foundation  
Project location:   Tampa Bay, Florida  
Grant period:   Jan 1 - Dec 31, 2020  
Grant amount:   $25,000  
Land Ownership:   Public  
Lat/Long:   Multiple Locations  
Types of Habitat:   Seagrass Bed  
Project leader:   Jeremy Linneman, Special Projects Director
The Ocean Foundation
1990 M Street NW, Suite 250
Washington, DC 20036

Species Benefiting From Restoration:
   • Halodule wrightii (Shoal grass)
   • Thalassia testudinum (Turtle grass)
   • Syringodium filiforme (Manatee grass)

Acres of Habitat To be Restored:
7,000 linear feet of scars, spread out over at least 50 acres of seagrass meadow will be restored.

Project Summary:
Seagrass meadows are disappearing, and so too are the services they provide to other animals in the sea. The best estimate is that we have lost over 25 percent of seagrass meadow coverage in the world’s ocean in the last four decades. The losses continue on a daily basis due to the many threats faced by seagrass, such as scars and blowouts created by boat propellers, anchors, and vessel groundings. Propeller scars are areas that have been stripped of aquatic plant life as a result of the propeller of a moving boat inadvertently being allowed to come into contact with the estuary bottom, thereby cutting not only the seagrass blades, but more catastrophically, slashing underground rhizomes and roots as well. A blowout typically results when the hydraulic action of a propeller wash forms a hole in the estuary bottom. Left unchecked, these types of damages leave the seagrass meadow vulnerable to further erosion, and can eventually destroy the whole seagrass bed. For this proposal, all restoration activities will take place in Cockroach Bay Aquatic Preserve in Tampa Bay, Florida.

On-the-Ground Activities:
To restore areas of seagrass that have been damaged by propeller scars and blowouts, the restoration contractor employs its Sediment Tube technology to replace sediment into damaged areas while minimizing the turbidity of the water. The Sediment Tube is made of specialized cotton that biodegrades fully over a period of 3 – 5 months and is filled with native sediment to provide a viable growing medium. After approximately three to five months, seagrass planting units are inserted into the partially degraded Sediment Tubes. Based upon our experience, complete seagrass restoration is achieved 18 to 24 months after the Sediment Tubes are initially placed into the propeller scar or blowout area.

Simple project outline:

  1. Locate and Survey the required square footage of propeller scarring and vessel groundings
  2. Return the injury sites to grade through the installation of Sediment Tubes (FKNMS PEIS 2.2.6)
  3. Collect and Install Planting Units according to the NOAA protocols detailed in the FKNMS PEIS at both the propeller scarring and the vessel grounding sites. (as required)

Community Involvement:
In order to bring more awareness and provide community involvement in this project, instructors from the University of South Florida (St. Petersburg campus) will be engaged to include marine biology students for the restoration activities. These students will receive hands-on experience and training regarding seagrass restoration activities. It is expected that 10 students will be engaged for 3 days each, during the restoration activities of filling and placing sediment tubes. The students will be volunteers for The Ocean Foundation and will receive community service recognition.

Click on photo to enlarge

Proprietary sediment tube technology
Proprietary sediment tube technology

Photos by The Ocean Foundation

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NOAA Restoration Center

Gulf of Mexico Foundation

Seagrass Recovery

Gulf of Mexico Foundation - PMB 51, 5403 Everhart - Corpus Christi, TX 78411
(800) 884-4175 toll free - (361) 882-3939 phone - (361) 882-1262 fax
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