| 摘要 |
<p>A fish cage which may be submerged and later elevated, may be provided with one or more buoyancy rings which are entirely or partially hollow, and having valves for intake or outlet of water, and injection and outlet of air, and having set in tight partition walls or perforated baffle plates inside the buoyancy rings. The new trait of the fish cage is that two main partition walls divide at least one of the buoyancy rings in a way so that the buoyancy ring consists of a larger horizontal sector (A) and a smaller horizontal sector (B). Thereby the larger sector of the fish cage's buoyancy ring may be opened to let water flow freely into the buoyancy ring simultaneously with the air being pressed out through the valves arranged close to sector (B) and being held highest near the water line by sector (B). The fish cage may thus hang on sector (B) separately. When part (A) has been submerged, one may perform a balanced, controlled submersion by opening the valves of sector (B). On elevating, section (B) is blown first and comes to the surface. Thereafter the larger sector A may be blown and evacuated of water, and the cage again floats.</p> |
