垂下式養殖網籠を利用した二枚貝と海藻の混合養殖の生産ならびに環境効果

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タイトル別名
  • The Productive and Environmental Effects of Mixed Cultivation of Noble Scallop Chlamys nobilis and Macroalga Meristotheca papulosa Using Suspended Aquaculture Net Cages
  • スイカシキ ヨウショクモウカゴ オ リヨウ シタ ニマイガイ ト カイソウ ノ コンゴウ ヨウショク ノ セイサン ナラビニ カンキョウ コウカ

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抄録

The effects of mixed cultivation of noble scallopChlamys nobilisand macroalgaMeyistotheca papulosaon their productivity and its potential in restoring eutrophic coastal ecosystems were examined under field and laboratory conditions. From the field, we compared the productivity among three cultivated systems, mono-culture ofC. nobilis, mono-culture ofM. papulosa, and their mixed culture, in the Uwa Sea. Field results showed the standing crop ofM. papulosawas significantly higher in the mixed cultivation than in the mono-cultivation. This result was supported by our laboratory experiments that indicatedM. papulosaeffectively assimilated ammonia excreted byC. nobilis. Under mixed cultivation in the field, we found no effects of the macroalgal covering on the growth of suspension feedingC. nobilis. Furthermore, the number of barnacles attached toC. nobiliswas fewer in the mixed culture than in the mono-culture. These results suggest that the incorporating mixed cultivation of scallops and macroalgae would be more profitable not only due to its higher algal productivity, but also due to lower labor costs in removing barnacles off the shell to improve market value. We finally discuss environmental effects of the mixed cultivation, focusing on increasing water quality and rehabilitation of macroalgal beds in the eutrophicated coastal ecosystems.

収録刊行物

  • 水産増殖

    水産増殖 55 (4), 547-555, 2007

    日本水産増殖学会

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