抄録
The laboratory and the field experiments was conducted by using of carboxylic acids (malic and citric acids)
for artificial formation of seaweed Sargassum ptens bed. In the laboratory experiment, both malic and citric acids were confirmed to promote the growth of germlings and fronds of S. patens in the culture. In the field experiment, the experimental substratum was prepared using a plastic plate (200×200mm in size, 10mm in thickness) coated the resin containing the respective carboxylic acid. Each of the plates was sowed with about l,000 germlings and soaked in the experimental ground at 2m in depth. S. patens on the malic acid plates highly showed good growth for 8 months and many fronds survived on the plates. Meanwhile the growth of S. patens on the citric acid plates was low and inferior to the effect of the malic acid plates. The fronds of S. patens on the plates non-treated became extinct in 4 months. The field observations showed that malic acid was a nourishing source for the growth of S. patens and also prevented benthic animals from grazing in seaweed bed. A beneficial effect on formation of seaweed bed can be expected by utilization of malic acid.
