Rehabilitation of public oyster reefs damaged or destroyed by a natural disaster

Date

1981

Authors

Hofstetter, R.P.

Journal Title

Journal ISSN

Volume Title

Publisher

Texas Parks and Wildlife Department, Coastal Fisheries Branch

Abstract

Flooding on the Trinity River (Texas) during 1979 was severe. Oyster mortality began in late May when salinity dropped below 5 parts per thousand. By mid-July oyster populations on 217 ha in Trinity Bay suffered 100% mortality and an additional 100-120 ha experienced partial damage. Further flooding occurred during late summer. Oyster growth was slowed and spawning inhibited. The overall spat set was very low (averaging 24 spat per sample). A Federal Grant-In-Aid Award was obtained to spread 39,491 m cubed of oyster shell for cultch at a cost of $619,782.96. Shell plantings were begun on 10 June 1980 and completed on 2 July 1980. Oyster shell was sprayed in a thin layer over 313 ha at nine sites in central Galveston Bay. Planting rates ranged from 77 to 142 m cubed/ha and averaged 126 m cubed/ha. During September 1980 spat were found at all sites. Shells with spat averaged 67.8% of the total number recovered. These had received an average set of 4.8 spat/shell. This is equivalent to a set of 3.7 million spat/ha. Success of the plantings from the fisherman's viewpoint can be judged when the 1980 spat reach marketable size (76 mm +) during the 1982-83 harvest season.

Description

9 pgs.

Keywords

oyster reefs, disasters, habitat, floods, reefs, oysters, Crassostrea virginica

Citation