Journal of Tropical Oceanography >
Degradation effects of Bacillus licheniformis strain De on shrimp (Litopenaeus vannamei) dejecta
Received date: 2008-05-30
Revised date: 2008-11-12
Online published: 2010-07-29
Supported by
国家“十一五”支撑项目(2006BAD03B0106, 2006BAD09A07); 中央级科研院所基本科研专项(2007ZD01); 广东省科技计划
(2007A020400001); 广东省重大科技兴渔项目(A200899A06); 公益性农业行业专项(nyhyzx07-042\200803012); 现代农业(虾)
产业技术体系建设专项 (nycytx46); 广东省鱼病防治专项(2130108)
The degradation activity of Bacillus licheniformis De strain on shrimp dejecta was analyzed by an independent analytical method. The interference effects are avoidance, including biologic or environmental factors in ecosystem of aquaculture ponds. Dejecta of Litopenaeus vannamei was collected, dehydrofreezed, and dissolved in disinfected sea water after comminuted as powder. The degradation effects of NH3—N, NO2-—N, NO3-—N, PO4-—P and COD in the dejecta solution were studied at different temperature (16, 21, 26 and 31℃), dejecta (5, 10 and 20mg·L-1) and Bacillus concentration (1, 2.5, 5 and 10mg·L-1). The results show that concentrations of both COD and NO3-—N decreased; their average degradation rates respectively exceeded 60% and 50%, but the concentrations of NH3—N、NO2-—N and PO4-—P all continually increased. There were significant effects (p<0.05) of temperature and of all parameters, with optimum conditions respectively at 26—31ºC and Bacillus concentration of 5mg·L-1. The differences of each two groups were insignificant (p>0.05) as the dejecta concentration exceeded 10mg·L-1.
Key words： Bacillus licheniformis; Litopenaeus vannamei; dejecta; degradation effects
CAO Yu-cheng,LI Zhuo-jia,LIN Xiao-tao,YANG Ying-ying . Degradation effects of Bacillus licheniformis strain De on shrimp (Litopenaeus vannamei) dejecta[J]. Journal of Tropical Oceanography, 2010 , 29(4) : 125 -131 . DOI: 10.11978/j.issn.1009-5470.2010.04.125
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