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<p>A marine biomass utilization system is developed in this study to address nutrient imbalances in semi-enclosed coastal seas such as Osaka Bay. Osaka Bay's nutrient imbalances pose significant environmental challenges, with eutrophication occurring in the northeastern part and nutrient deficiencies occurring in the southwestern part. Using biofertilizer derived from nitrified methane fermentation residue, this study examines the potential for enhancing phytoplankton and seaweed growth. The phytoplankton and seaweed culture experiments were conducted at Marine Fisheries Research Center, Research Institute of Environment, Agriculture and Fisheries, Osaka Prefecture. The seaweed photosynthesis experiments were carried out at Nakamozu campus of Osaka Metropolitan University. The biofertilizers used for both experiments were provided by the university’s laboratory as a part of nitrification experiments using methane fermentation residue. The results of the phytoplankton culture experiments showed that the addition of biofertilizer significantly enhances <i>Chaetoceros neogracilis</i> growth rate. The results of the seaweed photosynthesis experiments noticed that the relative growth rates of <i>Ulva</i> sp. with biofertilizer is much higher than that without biofertilizer. The results of seaweed culture experiments suggested that the addition of biofertilizer enhances growth rate and reduces discoloring of <i>Undaria pinnatifida</i>. These results indicate that the addition of nitrified methane fermentation residue effectively promotes growth of phytoplankton and seaweed.</p>

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Study on efficiency of marine biomass utilization system for countermeasures of nutrient imbalance in enclosed seas, part 2: fertilization effects for phytoplankton and seaweed

  • 期刊论文

  • 发表日期：

    2026年6月2日

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  • Shamsun Nahar Ritu,
  • Keiichiro Osaki,
  • Keigo Yamamoto,
  • Tomoyuki Yamanaka,
  • Hirotaka Tsujimura,
  • Koji Otsuka

摘要

A marine biomass utilization system is developed in this study to address nutrient imbalances in semi-enclosed coastal seas such as Osaka Bay. Osaka Bay's nutrient imbalances pose significant environmental challenges, with eutrophication occurring in the northeastern part and nutrient deficiencies occurring in the southwestern part. Using biofertilizer derived from nitrified methane fermentation residue, this study examines the potential for enhancing phytoplankton and seaweed growth. The phytoplankton and seaweed culture experiments were conducted at Marine Fisheries Research Center, Research Institute of Environment, Agriculture and Fisheries, Osaka Prefecture. The seaweed photosynthesis experiments were carried out at Nakamozu campus of Osaka Metropolitan University. The biofertilizers used for both experiments were provided by the university’s laboratory as a part of nitrification experiments using methane fermentation residue. The results of the phytoplankton culture experiments showed that the addition of biofertilizer significantly enhances Chaetoceros neogracilis growth rate. The results of the seaweed photosynthesis experiments noticed that the relative growth rates of Ulva sp. with biofertilizer is much higher than that without biofertilizer. The results of seaweed culture experiments suggested that the addition of biofertilizer enhances growth rate and reduces discoloring of Undaria pinnatifida. These results indicate that the addition of nitrified methane fermentation residue effectively promotes growth of phytoplankton and seaweed.