In 2014 the Research Center for Marine Education of the Ocean Alliance at the University of Tokyo carried out the first nationwide survey of 6th and 9th graders at public schools to assess their "ocean literacy." In this article, I would like to report on the current state of ocean literacy and challenges for improving it in future.

The water quality of the Seto Inland Sea has improved due to a decrease in the inflow load of nitrogen, phosphorus, and other elements. However, at the same time, the oligotrophic conditions are created, and have resulted in a dramatic fall in fish and shellfish production. With the revision of the Law Concerning Special Measures for Conservation of the Environment of the Seto Inland Sea, direction has been provided for a reorientation towards the Seto Inland Sea as a cultivable "garden" or "farm." This article proposes an effective use of oyster shells as a possible tool in successfully achieving both of these.

Many divers visit oceans with coral reefs. Abundant life forms are found there, showing a different visage each time you dive. However, at present, coral reefs are disappearing due to damage done by the feeding habits of the starfish, bleaching caused by rising ocean temperatures, and the increasing scale of human activities, including development. This article suggests what divers should do to leave healthy coral reefs for the future.