Studies on the tank culture of economic seaweed
This study aims to find the optimal operation and management for tank culture Caulerpa microphysa (sea grape) and Ulva lactuca. Several important factors influence the growth and yield of both seaweed are tested. These factors include the tanks shape and size, nutrients quality and quantity, water exchange rate, nature or artificial light, water inlet and outlet, aeration pipes. In addition, the nutrition, storage and utilization of the harvest seaweed are investigated. Caulerpa microphysa cultured in the designed tanks indoor could extend the edible stem to 30 cm length, had an average yield of 7.8 kg/m2/month and ＞90% harvest product in 2 months’ storage. Ulva lactuca cultured in outdoor pond at stock density 1 kg/m2 had SGR of 7-12 ％/day. According the experimental data it is estimated the CO2 fixation rate is 79.2 ton/ha/y and 11.9 ton/ha/y by Ulva and Caulerpa individually