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Cultivation of red seaweed Kappaphycus alvarezii (Doty) at different depths in South Sulawesi, Indonesia

The culture of red seaweed Kappaphycus alvarezii in shallow water is at present increased in accordance with the necessity to multiply biomass. This economic commodity is highly demand for its polysaccharide. However, an effort to expand the cultivation area is difficult to several places. This problem may be overcome by employing some hanging rafts at different depths. This research was carried out for 49 days under three different treatments, i.e. two morphological types (green and brown), three initial seedlings (50, 100 and 150 g) and five different water depths (1, 2.5, 4, 5.5 and 7 m). The result showed significant differences in growth and biomass among the three treatments (P<0.01). The green strain was influenced by the prolonged period of heavy rain, while the brown one by rainy and hot weather suggesting that this plant may exist along the year. The maximum daily growth rate and biomass was monitored at 100 g initial seed as 5.03% and 10,219 g m for green strain and 5.78% and 11,450 g m at 150 g initial seed for brown strain. Meanwhile the maximum carrageenan content was observed at higher depth for both green and brown strains.