20257Month4from the day5The event was held at the Kashiwanoha Conference Center over the weekend.2025At the annual conference of the Society of Ecological Engineering, graduate student Daiyo Yamada of our university won the Outstanding Presentation Award.

【Winner】
Daiyo Yamada (Graduate School of Marine Science and Technology, master's course)1(Major: Marine Life and Resource Sciences)

[Title of award-winning research]
Yellowtail grouperEpinephelus malabaricus For SpirulinaArthrospira platensis Fundamental research on the development of compound feed containing?
(Co-authors: Daisuke Yamada and Kurihara((I.e.)Monko, Masato Endo(Tokyo University of Marine Science and Technology),Ryodo Shimabukuro, Yuji Hiratsuka, Shingo Udagawa, and Akihiro Takemura(University of the Ryukyus))

[Details of award-winning research]
　In marine fish farming, there is a need to reduce substances discharged into the environment and the fish meal contained in the feed. We are therefore conducting research into a material recycling type of aquaculture in which the microalgae Spirulina is cultivated in wastewater from marine fish farming and used as an alternative protein feed ingredient to fish meal.

　In this study, we used the amberjack grouper, a fish species targeted for marine aquaculture.Epinephelus malabaricusFor SpirulinaArthrospira platensis In order to develop a compound feed containing this ingredient, test feed was prepared with different fish meal replacement ratios and feeding tests were conducted.

　As a result, fish meal was replaced with spirulina powder.25%or50The replacement feed showed higher growth rates than fish meal.75In the test area where the percentage was replaced3Of these,1It was also found that poor feeding occurred in two tanks, and that it was necessary to improve the feeding rate by adding a feeding inducer, etc.90% or more. Based on this, it is currently believed that spirulina powder50%It was suggested that it is possible to substitute fish meal up to 100g/kg.

　The results of this research demonstrate the possibility of using microalgae to replace fishmeal in marine fish feed, providing new insight that will contribute to the development of material-circulating aquaculture, and were highly praised by the judges.

Daiyo Yamada(Right photo)