Penelitian ini bertujuan untuk mengetahui pengaruh pH terhadap pertumbuhan rumput laut Caulerpa sp. Penelitian ini dilaksanakan pada bulan Juni-Juli 2024 di Baluno Desa Binanga, Kecamatan Sendana, Kabupaten Majene, Provinsi Sulawesi Barat. Penelitian ini menggunakan Rancangan Acak Lengkap dengan 4 perlakuan dan 3 ulangan dengan pH 3 pada perlakuan A, pH 6 pada perlakuan B, pH 8 (normal) pada perlakuan C dan pH 9 pada perlakuan D. Adapun parameter uji meliputi pertumbuhan mutlak dan laju pertubuhan spesifik serta analisis data menggunakan One Way-ANOVA untuk mengetahui nilai signifikan dari pengaruh perlakuan yang diberikan. Hasil penelitian yang
diperoleh bahwa pH tidak berpengaruh nyata terhadap pertumbuhan mutlak dan laju pertumbuhan spesifik Caulerpa sp. Berdasarkan hasil penelitian pertumbuhan mutlak tertinggi pada perlakuan D sebesar -174 g, perlakuan C sebesar -194 g, perlakuan A sebesar -196 g dan perlakuan B sebesar -202 g. Sedangkan laju pertumbuhan mutlak tertinggi pada perlakuan D sebesar -5,05 %/hari, perlakuan C sebesar -9,49 %/hari, perlakuan A sebesar 10,46 %/hari, dan perlakuan B sebesar - 11,32%/hari.

This study aims to determine the effect of pH on the growth of seaweed Caulerpa sp.. This study was conducted in June-July 2024 in Baluno, Binanga Village, Sendana District, Majene Regency, West Sulawesi Province. This study used a Completely Randomized Design with 4 treatments and 3 replications with pH 3 in treatment A, pH 6 in treatment B, pH 8 (normal) in treatment C and pH 9 in treatment D. The test parameters include absolute growth and specific growth rate and data analysis using One Way-ANOVA to determine the significant value
of the effect of the treatment given. The results of the study obtained that pH had no significant effect on the absolute growth and specific growth rate of Caulerpa sp.. Based on the results of the study, the highest absolute growth in treatment D was -174 g, treatment C was -194 g, treatment A was -196 g and treatment B was -202 g. While the highest specific growth rate in treatment D was -5.05%/day, treatment C was -9.49%/day, treatment A was 10.46%/day, and treatment B was11.32%/day