Oct 28, 2014

Settlement, growth and survival of eastern oysters on alternative reef substrates

BioRxiv : the Preprint Server for Biology
Seth J. TheuerkaufRomuald N. Lipcius

Abstract

Restoration of the native eastern oyster ( Crassostrea virginica ) has been severely hindered by the dwindling supply and rising costs of fossil and new oyster shell for use in reef restoration. Consequently, emphasis has shifted to the use of alternative oyster reef materials, which need to be tested for their effectiveness as settlement substrate. Furthermore, low recruitment of wild larvae has also impeded restoration, indicating a need to assess the potential of field setting of cultured larvae. We experimentally examined oyster settlement, growth and survival on unconsolidated oyster shell, oyster shell embedded vertically in concrete, and concrete Oyster Castles® in field and mesocosm experiments. In addition, we examined settlement success of cultured larvae in the mesocosm experiment. In the field experiment, juvenile recruitment was 3x higher on castles and unconsolidated shell than on embedded shell. Castles retained 4x the number of oysters and hosted 5x the biomass than embedded shell, and retained 1.5x the oysters and hosted 3x the biomass than unconsolidated shell. The proportion of live oyster recruits on castles was 1.5x that on both embedded and unconsolidated shell. In the mesocosm experiment (90-d post-larval...Continue Reading

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Mentioned in this Paper

Study
Oyster Shell
Oyster brand of calcium carbonate
Crassostrea virginica
Larva
Leptandra virginica, homeopathic preparation
Carcinoma Showing Thymus-like Element
Oyster allergenic extract
Laboratory Culture
Oysters

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