| 摘要 |
PCT No. PCT/NO90/00189 Sec. 371 Date Aug. 13, 1992 Sec. 102(e) Date Aug. 13, 1992 PCT Filed Dec. 17, 1990 PCT Pub. No. WO91/09517 PCT Pub. Date Jul. 11, 1991.A fish cultivation tank including a suction unit rotatable about the bottom of the tank in response to a falling of the water level within the tank. A combined weight and float assembly moves in response to movement of the water level and is operationally joined to the suction unit to rotatably drive the suction unit in response to a lowering of the water level. The lowering of the water level is effected by a siphoning of water and debris from the tank whereby the siphoning of the debris occurs simultaneously with rotation of the suction unit.
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