The present invention relates to a culturing liquid composition for promoting growth of marine algae such as Eucheuma cottoni, spinosum, or gracilaria, and a method for culturing Eucheuma cottoni, spinosum, or gracilaria. By using the culturing liquid for Eucheuma cottoni, spinosum, or gracilaria according to the present invention, Eucheuma cottoni, spinosum, or gracilaria can be cultured for 5 to 8 times a year. The culturing liquid comprises 0.8-1.2 mL of a micronutrient solution.
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