PROBLEM TO BE SOLVED: To provide an aquatic organism breeding system, a method for starting the same, and an aquatic organism breeding unit, in which excrement of aquatic organisms can be converted into harmless materials and circulated, and the need for water exchange processing is eliminated semipermanently or over a long term without separately providing a device for covering a filtering function.SOLUTION: An aquatic organism breeding system 1 is configured to include: an aerobic layer 6 formed below a breeding water holding tank 2 for holding a breeding water 9 containing organisms derived from organic matter, and being an aerobic environment and having aerobic bacteria inhabited therein an anaerobic layer 4 formed below this aerobic layer 6, and being the anaerobic environment and having absolute anaerobic bacteria inhabiting therein, and comprising andosol 40 an anaerobic space 3 being an anaerobic environment, and in which the absolute anaerobic bacteria inhabiting the anaerobic layer 4 and products generated by the absolute anaerobic bacteria are made to flow therein a facultative anaerobic layer 5 formed between the aerobic layer 6 and the anaerobic layer 4, and inhabited by facultative anaerobic bacteria and a pipe 8 for bringing a breeding space 90 into communication with the anaerobic space 3.COPYRIGHT: (C)2015,JPO&INPIT【課題】水棲生物の排泄物等を無害な物質に変換して循環させることができ、濾過機能を補う装置を別途設けることなく半永久的ないし長期間に亘って換水処理を不要とした水棲生物飼育システム、水棲生物飼育システムの立ち上げ方法及び水棲生物飼育ユニットを提供する。【解決手段】水棲生物飼育システム1は生物由来の有機物を含有する飼育水9を保持する飼育水保持槽2の下方に形成され、好気的な環境であり、好気性細菌が生息する好気層6と、この好気層6の下方に形成され、嫌気的な環境であると共に絶対嫌気性細菌が生息し黒ぼく土40により構成される絶対嫌気層4と、嫌気的な環境であり絶対嫌気層4に生息する絶対嫌気性細菌及び絶対嫌気性細菌により生成された生成物が流入する嫌気空間3と、好気層6と絶対嫌気層4との間に形成され通性嫌気性細菌が生息する通性嫌気層5と、飼育空間90と嫌気空間3とを連通するパイプ8とを備えるように構成される。【選択図】図1
