| 摘要 |
Problems to be solved by the present invention are: (i) to make it possible for bred fishes, such as tuna, to swim fully and safely without danger of collision to the wall; (ii) to make it possible for fry to safely survive without being eaten by young and grown fishes; (iii) to largely reduce energy consumption needed for water purification; and (iv) to largely reduce labor needed for cleaning and regenerating filter means. These problems are solved by the invention of equipment for migratory fish breeding, in which a breeding tank formed in a circle and a purified water tank formed in a shape lacking a part of a circle (an “occulted circle”) are included, both tanks closely set together like a pair of eye-glasses. The breeding tank is provided with water lanes for separating infant (fry), young, and grown fishes from each other, each given a circular water current. In the purified water tank, there is placed water filtering means and purified (filtered) water is stored there. Both tanks are held substantially at the same water level, as the tanks are mutually connected by a water duct to supply raw water to the filtering means from the breeding tank, and water injection means for injecting water into the breeding tank from the purified water tank.
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