Abstract
Coal-flyash concrete and ordinary concrete plates were immersed in the sea near Shin-Nagasaki fishing port, Nagasaki, Japan, for different periods from October, 2004, to January, 2006. The marine sessile organisms that settled on these plates were studied. Throughout the study period, barnacles (Amphibalanus amphitrite, B. trigonus), bryozoans (Bugula neritina), ascidians (Styela plicata), some species of polychaetes, and algae were observed settling on both kinds of plate. Wet weights of organisms on the two types of plate were the same. These results indicate that coal-flyash concrete is suitable for use in constructing artificial fishing reefs, as a substitute for usual concrete.
