王振华，刘 晃
（农业部渔业装备与工程技术重点实验室，中国水产科学研究院渔业机械仪器研究所，上海 200092）

摘要：为提供实际生产理论依据，改良系统水处理工艺，开展循环水养殖系统中吉富罗非鱼氮收支和对水质情况的初步研究。起始养殖密度8 kg/m3，投饲率2%，系统循环量1 m3/h，总水量0.8 m3。试验期间溶解氧大于6 mg/L，pH7.0~7.2，水温23~25℃。每周监测水质2～3次，监测指标包括氨氮、亚硝酸盐氮、硝酸盐氮，每2周检测1次水中总氮。用凯氏定氮法测定实验前后饲料、试验鱼体、粪便、悬浮颗粒的氮含量。结果显示，摄食氮有50.00±1.50%转化为生长氮，32.61±1.38%转化为排泄氮，17.39±4.0%转化为粪氮；58%的粪氮为悬浮颗粒物，42%为可沉淀颗粒物。
关键词：罗非鱼；氮收支；循环水养殖

Nitrogen budget and water quality of tilapia in recirculating
aquaculture system
WANG Zhen-hua, LIU Huang
（Key Laboratory of Fishery Equipment and Engineering, Ministry of Agriculture,Fishery Machinery and Instrument Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200092, China）

Abstract: A preliminary study was conducted about nitrogen budget of tilapia in a recirculating aquaculture system to provide theoretical date for industrial production and improve the process of water treatment. Initial stocking density was 8 kg/m3, the feeding rate was 2% of fish body weight, the circulation volume was 1m3/h and total water volume was 0.8m3. During the experiment, the dissolved oxygen was above 6 mg/L, the pH was 7.0~7.2, and water temperature was 23~25℃. Ammonia nitrogen, nitrite nitrogen and nitrate nitrogen was measured twice a week and total nitrogen was measured once a week. The nitrogen content of feed, fish, faeces and suspended particles was determined by Kjeldahl analyzer. Results showed that, the diet made 50.00±1.50% growth nitrogen proportion, 32.61±1.38% excretion nitrogen proportion and 17.39±4.0% fecal nitrogen proportion. Additionally, about 58% of the fecal nitrogen was in the form of suspended solids nitrogen eventually.
Key words: tilapia; nitrogen budget; water quality; recirculating aquaculture

基金项目：科研院所技术开发研究专项项目“节能型高密度循环水养殖系统关键技术研究和示范”（2010EG134287）
作者简介：王振华（1986—），女，助理工程师，主要从事水产养殖工程和化学分析工作。E-mail：wangzhenhua@fmiri.ac.cn
通讯作者：刘 晃（1973—），男，副研究员，硕士，主要从事水产养殖工程研究。E-mail：liuhuang@fmiri.ac.cn
 

（《渔业现代化》2011.38（5）：12-16）