| 摘要 |
PROBLEM TO BE SOLVED: To provide an overland culture system and apparatus circulating the culture water, capable of shortening the culture period and improving the culture productivity without using chemicals and enabling the reduction of the apparatus size. SOLUTION: The culture apparatus for the overland breeding of fish and shellfish with seawater is composed of a breeding water tank 6 a biological treating apparatus 10, an ozone cleaning apparatus 11 and pipes connecting the above apparatuses to form a closed circuit. The treating apparatus 10 is provided with a packed layer holding a carrier 20 supporting nitrifying bacteria at a high concentration, a filter material to capture suspending substance and a supporting material 21 in three layers and a cleaning nozzle placed in the middle or at the bottom of the packed layer. The cleaning apparatus 11 has an inlet port to introduce a mixed gas 17 of ozone 18 and air 15 at the lower part. The pipe connecting the apparatus 10 and the apparatus 11 is successively connected with a pipe 14 to directly circulate to the breeding water tank 6 and a pipe 5 to introduce clean seawater obtained by the precision filtration of sand-filtered seawater. The ozone cleaning apparatus may be provided with a contact tank 12 to remove the generated oxidant. |
