Abstract: Seaweed as one of the export commodities and potential to be developed is C.fragile because it has a fairly high nutritional content as a source of vegetable protein, minerals, and vitamins, and has a high Fe content. A very important factor in supporting the success of seaweed cultivation is the depth of planting and the proper maintenance container when the seaweed is cultivated. This study aimed to analyze the effect of different cultivation depths on the growth of C. fragile. This research used a container in the form of a bag made of bamboo and nets. Then analyzed the growth and content of carotenoids. This study was designed using a Randomized Block Design (RAK) which consisted of 3 treatments with 3 replications each. As treatment is the use of depths of 40 cm, 80 cm, and 120 cm. The results showed that different depths had a significant effect (P<0.05) on the growth of C. fragile seaweed. The best cultivation depth for the growth of C. fragile seaweed is 40 cm.