In the seaweed cultivation is done dibak concrete or maintenance is covered as spray cultivation techniques that have been developed in Indonesia is relatively easier maintenance as well as planting more controlled area is not too large it easier in everyday care. Care required for maintenance covered inter alia the control channel or water circulation and continuous observation of water quality, especially the content of nutrients such as nitrates and phosphates contained in maintenance media.
This method is more favorable because the water quality control easier, more efficient gas exchange, relatively free of predators, the absorption of nutrients by the thallus can be organized and easily harvested. Maintenance which includes the supervision and maintenance of both cultivation and plant construction should be carried out continuously so that the successful cultivation of the maximum. Construction of cultivation must be maintained from the damage caused by natural or decrease if the durability of materials. Large waves can cause uprooting stakes, anchors and rope breaking ris and the main ris.
Care of the facilities and the seaweed itself periodically carried out by observation. Any damage that occurs due to the influence of wind and waves, like the construction damage or raft position, straps are loose or broken, immediately corrected. Cleaning of waste or various tacks on the raft and the seaweed was also carried out at the same time. If there is a seaweed seedlings attacked by pests or disease symptoms, it should be cut so that the seedlings were damaged not spread to other parts of the thallus.
If necessary seeds are broken or detached from the bond is replaced with a new one. Observation and treatment carried out with a frequency of between 2 × 1 × 2 weeks to 1 week. The reduced durability of materials and knocked stakes, raft or rope break or ris ris main. In order maintenance should be performed daily supervision and repairs done immediately to the damaged parts. Delays in repair may lead to a greater loss due to the increasing number of plants that would be lost.
Management and maintenance of seaweed is one of the critical success factors of seaweed, in addition to factors internal and external factors that have been described previously. Factors that must be considered such as the management of the waters of the substrate and also the spacing of seedlings in a floating raft (Syaputra, 2005). Seaweeds are marine organisms that have specific environmental requirements in order to live and grow well. The more appropriate environmental conditions the waters of the better growth and the results will be even better.
From some research and observation of the rate of growth of seaweed in mind that the tendency of growth of seaweed is not the same age, a large clump of seedlings and according to different seasons. The growth rate is highest in the first weeks pananaman, then speed is reduced and after 2 months the rate of growth slowed. Of the number of seedlings planted and the calculation of growth then we can calculate and make estimates of the results that will be obtained when harvested so as to know the benefits to be derived from the seaweed farming.