Land farming system

摘要

PROBLEM TO BE SOLVED: To provide a closed-circulation type land culture system retaining a good water quality of sea water for preventing damage of pest, virus, and the like, being economical, and having a high popularization property.SOLUTION: A land culture system 1 comprises, on land: a breeding tank 10 for breeding swimming fishes; a cleaning tank 20 for breeding the annelida and cleaning the seawater from the breeding tank 10; a mineral supply tank 30 for supplying the seawater with mineral; and the like, so as to form a closed circulation system. In the cleaning tank 20, residual feed and excretory substances contained in the seawater are eaten by the annelid, and further decomposed by plankton proliferated with the breeding of the annelid and by proliferated aerobic bacteria, so that the seawater is cleaned. In the mineral supply tank 30, the mineral is dissolved from stored mineral dissolution ores 31 to the sea water.