| 摘要 |
PCT No. PCT/NO96/00027 Sec. 371 Date Oct. 14, 1997 Sec. 102(e) Date Oct. 14, 1997 PCT Filed Feb. 5, 1996 PCT Pub. No. WO96/24245 PCT Pub. Date Aug. 15, 1996A float collar, comprising inner and outer float rings mounts the fish rearing unit for selective raising and lowering utilizing valve controlled air and water inlets and outlets leading to internal chambers within the float rings arranged symmetrically relative to a diametric axis of the float collar. |
