FIELD EXPERIMENT TO CREATE AN ARTIFICIAL FISH REEF FOR <i>Tridentiger obscurus</i> IN THE AMAGASAKI CANAL

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  • 尼崎運河でのハゼ科チチブの人工魚礁創出実験

Abstract

<p> To improve the environment of the Amagasaki Canal, a method for moving nutrients out of the system using a food web pathway derived from attached algae to fishes was investigated and field experiments were conducted. It was found that Tridentiger obscurus with bottom-dwelling properties gather in structures with some gap spaces installed near the water's surface. During the summer when water quality deteriorated, T. obscurus used the structures as a refuge. Such a structure would also reduce intraspecific competitions and allow for smaller T. obscurus to coinhabit around the shelter with the larger fish occupying the interstices of the structures. The stomach contents of T. obscurus suggested that they were feeding on attached algae and the shrimp in the structures. In addition, the T. obscurus were laying their eggs in the gap space of the structure.</p>

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