藍光及餵食對萼形柱珊瑚及鹿角珊瑚生理表現之影響

Abstract

以藍光飼養珊瑚能提升珊瑚鈣化率及刺激色素產生，然而卻會抑制共生藻的光合作用；餵食能使珊瑚成長更為快速、更具環境變化抵抗力，本實驗將兩者結合，探討藍光及餵食是否能使珊瑚具高生長率同時改變珊瑚色彩表現。本研究包括兩次實驗，實驗A使用萼形柱珊瑚(Stylophora pistillata, 縮寫成SP和細枝鹿角珊瑚(Pocillopora damicornis, 縮寫成PD)進行實驗，以LED燈提供藍光(強光:420；弱光: 250 μmol quanta m-2 s-1)，並且每周移至餵食缸餵食不同濃度(高餵:10 g；低餵:5 g)經滋養之豐年蝦2次；實驗B 則是用萼形柱珊瑚和銳枝鹿角珊瑚(Pocillopora acuta, 縮寫成PA)，並一樣在不同強度藍光養殖(強光:350；弱光: 80 μmol quanta m-2 s-1)和高低濃度豐年蝦餵食。兩次實驗皆飼養75天，存活率皆100%，且最大光亮子產率(Fv/Fm)都維持在0.6以上，兩次實驗SP的特定生長率都大於PA和PD；SP在實驗A特定生長率最高的組別為高餵高光組，實驗B則為低餵高光組，鹿角珊瑚生長率在實驗A並無顯著差異，而在實驗B則也是低餵高光組最高；兩次實驗色彩分析結果都顯示高光組具有較高的紅綠藍值(Red-Green-Blue value)，且藍光強弱跟餵食濃度都會顯著影響RGB值，尤其是強藍光，這些結果未來可應用在觀賞與復育用珊瑚的養殖與生產。

Culturing corals with blue light can increase the calcification rate of corals and stimulate the production of pigments, but it will inhibit the photosynthesis of symbiotic algae. Feeding can make corals grow faster and be more resistant to environmental changes. This study combines two experiments to explore whether blue light and feeding can increase coral growth rate and change coral color. Experiment A cultured Stylophora pistillata (SP) and Pocillopora damicornis (PD) under blue light (high intensity: 420; low intensity: 250 μmol quanta m-2 s-1) with LED lights, and fed with different concentrations (high: 10 g; low: 5 g) of enriched brine shrimp twice a week in the feeding tank. Experiment B cultured SP and Pocillopora acuta (PA) under different intensities of blue light (high light: 350; low light: 80 μmol quanta m-2 s-1) and different concentrations of brine shrimp. In both experiments, corals were reared for 75 days, the survival rate was 100%, and the maximum photon yield (Fv/Fm) was maintained > 0.6. The specific growth rate of SP in both experiments was greater than that of PA and PD; The highest specific growth rate in SP was high-fed and high-light group, and was low-fed and high-light group in experiment B. There was no significant difference in the growth rate of PD in experiment A, while in experiment B, PA had the highest growth rate in low-fed and high-light group. The color analysis results of both experiments were the same. It shows that the high-light group has a higher red-green-blue value, and the blue light intensity and feeding concentration significantly affected the RGB value, especially the high blue light intensity. These results can be applied to breed and produce corals for the ornamental aquarium and restoration in the future.