On Fouling Organisms in the Oyster Farm

摘要: In recent years a method of oyster culture, i. e., the so-called raft- or hanging-method has become popular all over coast Japan. said method, as name signifies, clusters oysters to be cultured are hung and suspended in sea by steel wire from raft which is kept buoyant some floats. While thus relaid sea, many kinds sessile organisms settle grow on living shell often densely they almost cover up whole surface shell-flish. The condition that continuously immersed water, not being given chance exposure air even receding tide chief cause fouling. fouling stand undoubtedly food rivals oyster, because them plankton feeders, so it quite certain brings about retardation growth extent. Not only that, organisms, such compound ascidians others encrust choke oyster. comes under deleterious effect ways And moreover, great nuisance farm. When season collected for marketing, most tedious work clean off oysters. cases when organism very heavy, mass s consists greater part themselves. Such rare. Nevertheless, virtue rich culture farm raft-method makes good fishing place edible fishes, gather around where sea. overgrown give fish its gool sheltering one hand plenty supply other.