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The artificial spawning material in which Japanese sandfish lays eggs was developed. The 1st purpose is development of the mitigation technology which complements a spawning function until natural seaweed is reproduced. The breakwater to which Japanese sandfish is laying eggs in the present at Tomakomai Higashi port will be moved in the future. The 2nd purpose is the technical development for adding the function of seaweed to a coast structure in the deep place of depth of water where natural seaweed cannot grow.The quality of the material is polypropylene of specific gravity 0.18. Therefore, it stands straight underwater by buoyancy. Although the form referred to the seaweed, the number of branches and the number of roots were made several times more than natural seaweed.Japanese sandfish laid eggs to all of the artificial spawning material installed in 2000.

DEVELOPMENT OF FISH SPAWNING GROUND BY THE ARTIFICIAL SPAWNING MATERIAL