クビレズタ養殖の生産性向上のためのCO₂ 利用技術

抄録

Caulerpa lentillifera J. Agardh grows in tropical and subtropical regions and it is an important marine product of Okinawa Prefecture, Japan and is cultured in onshore tanks all year round. However, the production of this species has been unstable, despite the establishment of cultivation methodology. On the other hand, studies examining the absorption and fixation of increasing carbon dioxide (CO_２) to macroalgae continues. This study aims to investigate the growth characteristics of C. lentillifera in CO_２-enriched seawater (CSW) to enhance productivity. When it was cultured in CSW_7.5mg (containing CO_２ of 7.5 mg L^-1), daily growth rates (DGR) were stimulated 1.6 times compared to the control (containing CO_２ of 0.5 mg L^-1). Additionally, under conditions of 24 hours of continuous lighting and continuous inflow of CSW_7.5mg , the effect of CO_２ on growth enhancement was greater than the control. Based on these results, we tested the method at a commercial cultivation farm for C. lentillifera, and determined that CSW stimulated growth by 1.2 times that of the control.