The Nanajugo-za-no-shinji as Shinto Ritual, offering hijiki Sargassum fusiforme as ambrosia, has being handed down since the end of the 13th century at Iwafune district of Kazusa-no-kuni in Boso Peninsula. At present, this district is part of the Isumi City, Chiba Prefecture, Japan. It has been performed by the tradition that local people at Iwafune district rescued noble Fujiwara Kanesada and his group who were wrecked and dropped off to Iwafune in 1275. The Nanajugo-za-no-shinji as Shinto Ritual offers 75 tables that put raw hijiki, dried bonito shavings, rice cake, boiled rice and sliced raw eggplant with half-split chopsticks in menu as ambrosia, for the 75 Gods. 　In the 8th to 12th centuries, Hijiki-Wake clan performed the noble person's funeral, especially for the Imperial clan. They offered Hijiki-Obono at the funeral, that was the boiled rice with a seaweed. The term“hijiki”, which is used today as a seaweed name, may be derived from Hijiki-Wake clan or Hijiki-Obono as one of the symbols of funeral. The Nanajugo-za-no-shinji as Shinto Ritual, as autumn festival at present, may originate in memorial funeral ceremony with hijiki for the Kanesada group.

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Caulerpa lentillifera J. Agardh grows in tropical and subtropical regions and it is an important marine product of Okinawa Prefecture, Japan and is cultured in onshore tanks all year round. However, the production of this species has been unstable, despite the establishment of cultivation methodology. On the other hand, studies examining the absorption and fixation of increasing carbon dioxide (CO_２) to macroalgae continues. This study aims to investigate the growth characteristics of C. lentillifera in CO_２-enriched seawater (CSW) to enhance productivity. When it was cultured in CSW_7.5mg (containing CO_２ of 7.5 mg L^-1), daily growth rates (DGR) were stimulated 1.6 times compared to the control (containing CO_２ of 0.5 mg L^-1). Additionally, under conditions of 24 hours of continuous lighting and continuous inflow of CSW_7.5mg , the effect of CO_２ on growth enhancement was greater than the control. Based on these results, we tested the method at a commercial cultivation farm for C. lentillifera, and determined that CSW stimulated growth by 1.2 times that of the control.

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This is errata to “Estimation of daily compensation point of young Ecklonia kurome in the western Seto Inland Sea”by K Sakiyama, N Murase, M Abe and M Noda in Algal Resources 2013 ; 6 : 59-65, where the equations for the daily light compensation point were wrong. The errata was summarized in the list. The daily light compensation point of young E. kurome that we calculated by the corrected equations was 0.73 % of the irradiance on the sea sureface. This value accorded with the value of the original article.

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