The study aimed to determine the effect of spacing on the growth of sea grapes (Caulerpa racemosa) with the longline method in the village of tanjung bele, moyo sub-district downstream, Sumbawa district. The research was carried out from April to May 2018 in the waters of the village of Tanjung Bele, Moyo sub-district, downstream, Sumbawa district. The method used is the experimental method with Completely Randomized Design (CRD) which consists of three treatment spacing and repeated five times. The treatments are: A (30 cm spacing), B (40 cm spacing), C (50 cm spacing). The data obtained are analyzed using ANOVA. Different spacing treatments provide significantly different growth to absolute growth and specific growth rate Different treatment of spacing gives a significantly different effect so that a further test was carried out with the Tukey HSD. Water quality parameter data were analyzed descriptively. The results showed that the absolute growth of sea wine in treatment A namely 201.87 grams, then treatment B 140.40 grams and treatment C amounted to 130.93 grams, while the specific growth rate of sea wine (Caulerpa racemosa), namely spacing of treatment A has an average value of 5.86%, Treatment B 4.83% and treatment C 4.46%. After further testing of absolute growth and specific growth rate of treatment which had significant differences, namely treatment A with B, A with C, B with C, and C with A. All treatments had significant differences. Water quality measurement results are still in the normal range for the growth of sea grapes.
                        
                        
                        
                        
                            
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