Grazers improve health of coral juveniles in ex situ mariculture

Scleractinian coral mariculture plays an increasingly important role in reef rehabilitation and the aquarium trade, but its efficiency can be impeded by fouling macroalgal blooms, thus compromising coral health and increasing maintenance costs. In this study, the sea urchin Salmacis sphaeroides and...

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Bibliographic Details
Published in:Aquaculture 2013-11, Vol.414-415, p.288-293
Main Authors: Toh, Tai Chong, Ng, Chin Soon Lionel, Guest, James, Chou, Loke Ming
Format: Article
Language:English
Subjects:
Algae
Animal and plant ecology
Animal aquaculture
Animal productions
Animal, plant and microbial ecology
Aquaculture
Aquatic ecosystems
Biocontrols
Biological and medical sciences
Biomass
Cnidaria. Ctenaria
Coral reefs
Echinoidea
Ex situ mariculture
Fundamental and applied biological sciences. Psychology
Gastropoda
General aspects
Herbivory
Invertebrates
Juvenile scleractinian corals
Pocillopora damicornis
Salmacis sphaeroides
Scleractinia
Sea water ecosystems
Synecology
Trochus maculatus
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Summary:Scleractinian coral mariculture plays an increasingly important role in reef rehabilitation and the aquarium trade, but its efficiency can be impeded by fouling macroalgal blooms, thus compromising coral health and increasing maintenance costs. In this study, the sea urchin Salmacis sphaeroides and the gastropod Trochus maculatus were introduced into ex situ coral mariculture tanks as biological controls of fouling macroalgae. We examined the effects of both grazers on the overall health of Pocillopora damicornis juveniles by quantifying the changes in growth, colour saturation and extent of tissue lesion of the corals for 24weeks. The juvenile corals exposed to S. sphaeroides and T. maculatus grew seven to eleven times faster than the controls, and attained final ecological volumes of 14104±2955mm3 (25.1±0.9mm diameter), 11913±2644mm3 (24±0.7mm diameter) and 1924±620mm3 (12.2±1mm diameter) respectively. The juvenile corals in the grazer treatments were also significantly darker and showed fewer lesions than that in the control. In the tanks with (S. sphaeroides, T. maculatus) and without (control) grazers, the mean algal cover was 37.5%, 57.4% and 78.8%, respectively, and the final algal biomass was 13.9±3.9mg, 27.3±8.1mg and 71.9±7mg, respectively. Taken together, the results showed that S. sphaeroides and T. maculatus are effective biological controls of fouling macroalgae in ex situ coral culture. •Salmacis sphaeroides and Trochus maculatus were used as biocontrols of macroalgae.•Grazer treatments improved the growth and health of juvenile corals ex situ.•Grazers were effective in controlling macroalgal fouling in mariculture tanks.•Introducing grazers improved cost effectiveness of coral mariculture.
ISSN:0044-8486
1873-5622
DOI:10.1016/j.aquaculture.2013.08.025