Who does not know seaweed. Given, seaweed in Indonesia is very diverse with various benefits. Green seaweed thrives in nutrient-rich environments, and some have the potential to grow very fast. Ulva is a green seaweed. The genus Ulva has received a lot of attention in the last decade for its nutritional content.
Several studies say that the protein content of Ulva is 10.0–20.4%; fat 0.1–3.6%; ash 12.4–32.9%; crude fiber 5.7–9.2% and BETN (Extract Material Without Nitrogen) 41.5–59.1% (in dry weight) (Rohani-Ghadikolaei et al., 2012; Khalafalla & El-Hais, 2015). Ulva seaweed has the ability to grow quickly, it has even been reported that the occurrence of green tides caused by the uncontrolled growth of Ulva in some tropical areas.
Among the various benefits of Ulva seaweed, there is also potential as a raw material for fish feed. Also considering that feed is an important component in aquaculture because it is needed in all stages, from seeding to harvesting. Feed helps growth, increases immunity, reduces the potential for fish mortality, and increases the quantity and quality of fish produced.
Moreover, high-quality feed that meets the nutritional needs of fish that are needed to support aquaculture activities. In addition to quality, the amount of feed given must also be sufficient. If not, it may slow down fish growth, lead to competition and even cannibalism.
The use of seaweed, such as Ulva as raw material for feed, has the advantage that it does not require land for cultivation. So, in the future, cultivation will not compete with food crops or residential land. In addition, nationally, the area of coastal areas that have the potential to be used for seaweed cultivation is also very wide.