| 摘要 |
PURPOSE:To obtain the title apparatus suitable in use on the water of river, lake and swamp by providing a culture bed having water permeating properties on the inside bottom surface of outer edge part having a specific gravity. CONSTITUTION:A frame of outer edge part 1 is formed with a material having <1 specific gravity such as foamed polystyrene moldings, etc., and a non-woven fabric, e.g., made of polyester is stretched on the bottom surface of the interior side to give a culture bed 2. A culture medium, preferably such as rock wool, sponge, etc., is put thereon and the culture bed 2 is kept so as to be under the waterline and upper surface of the culture medium is kept so as to be above the waterline to constitute the aimed apparatus. |
