Effect of light
sources and intensities on the growth of propagated corals Dipsastraea
pallida (Dana, 1846) and Dipsastraea speciosa (Dana, 1846)
S.M. Lim1,
N.L.W.S. Wong2* and A. Arshad 2,3
1Institute of
Bioscience, Universiti Putra Malaysia, Serdang, 43400, Selangor, Malaysia,
2International
Institute of Aquaculture and Aquatic Science, Universiti Putra Malaysia, Port
Dickson, 71050, Negeri Sembilan, Malaysia
3Department of
Aquaculture, Faculty of Agriculture, Universiti Putra Malaysia, Serdang,
43400, Selangor, Malaysia
*Corresponding Author Email : nurleena@upm.edu.my
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Abstract
Aim:
To determine the effect of different light sources and intensities on the
growth of propagated scleractinian corals Dipsastraea pallida and Dipsastraea
speciosa from Tanjung Tuan, Melaka.
Methodology: A total of 120 replicates from each D. pallida and
D. speciosa were kept under LED and fluorescent lights with three
controlled intensities (Photosynthetic Photon Flux Density, PPFD = 60, 80 and
100 μmol m-2 s-1). Initial weight was recorded
before the experiment and weekly growth in weights was recorded for six
weeks.
Results:
Dipsastraea pallida and D. speciosa achieved 8.26 mg and 8.28
mg under LED light, and 8.16 mg and 8.22 mg growth under fluorescent light in
six weeks 60 μmol m-2 s-1. The highest specific
growth rate for D. pallida and D. speciose was observed at 60
μmol m-2 s-1. Insignificant difference was
observed between LED and fluorescent lights for coral growth with same
intensity exposure. The study indicates that moderate light intensity at 60
μmol m-2 s-1 enhanced better growth rate than
higher intensity for D. pallida and D. speciosa from the turbid
waters of Tanjung Tuan, Melaka.
Interpretation: The experiment showed that corals from
turbid water, D. pallida and D. speciosa grow better under moderate
intensities than high intensities under both LED and fluorescent lights.
However, intensity from fluorescent light was less penetrating in seawater as
the lights have to be closer to water surface than LED lights which leads to
the concern of allowing of excess heat into the culture medium.?
Keywords: Corals, Dipsastraea pallida, Dipsastraea speciosa,
Fluorescent, Light intensity, Scleractinian coral
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