水産系副産物(貝殻)の漁場造成事業への活用

抄録

When oyster shells generated through oyster culture are placed on the ocean floor, it is understood that the shells have a positive effect on the improvement of bottom quality as well as a stabilizing effect on the growth of eelgrass. In Okayama Prefecture, the focus is being put on the effectiveness of oyster shells. Various examinations designed to quantify the effects of placing oyster shells on the ocean fioor are being carried out so that oyster shells can be put to practical use as a material for improvement of bottom quality in ooze see areas and to aid in the creation of tidelands and seaweed beds. Through these tests, it was demonstrated that the quality of the bottom was improving and that, along with the diversification of benthos, the survival rate of eelgrass was rising. "Guidelines for the Effective Use of Oyster Shells" were formulated in order to address concerns surrounding the use of oyster shells. Some such concerns included the necessity to clearly draw the line regarding rules on waste disposal in the ocean, intended uses and procedures for laying down shells based on the results up to this point. This report will discuss the progressions and results achieved thus far of verification tests conducted up until this point. Together with this, this report will discuss more about the contents of the guidelines and the future development of these findings.