八代海の浅海養魚場における栽培マコンブLaminaria japonicaの生産量とN、P吸収量

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  • ヤツシロカイ ノ センカイ ヨウギョジョウ ニ オケル サイバイ マコンブ Laminaria japonica ノ セイサンリョウ ト N P キュウシュウリョウ

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In an attempt to quantify the water purification capacity of cultured brown alga Laminaria japonica, we examined its production and uptake of nitrogen and phosphate in a coastal fish farm in Yatsushiro Sea, southern Japan. Seedlings of L. japonica were cultured in a coastal fish farm from December, 2002 to June, 2003 using different lengths of yarn, spacings of seedling insertion, and hanging depths. The maximum blade length (229cm), blade width (17.2cm), blade thickness (1.98mm), daily growth rate of blade length (3.53cm/day), and dry weight (13.6g dry/individual) were obtained with 5cm seedling yarn, inserted at 100cm spacing, and hanged at 2-3m deep. On the other hand, the greatest number of fronds per one meter of culture rope (443 individuals/m) was obtained with 20cm seedling yarn at 10cm spacing and 2m deep. The highest production of L. japonica (2.64kg dry/m) occurred in April and greatest nitrogen (6.95g N/m) and phosphate (1.11g P/m) uptakes in May with 20cm seedling yarn at 10cm spacing and 1-4m deep. The enlargement phase of this brown alga occurred in April while the substantialization phase in May. The correlation of blade length (BL, cm) and blade weight (W, g dry) of L. japonica has the following equation: W=5.28・10^<-4>・BL^<1.85>.

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