The Effects of Shrimp Gut Probiotic Bacteria on the Shrimp Larvae (Penaeus Chinensis)

The survival rates of shrimp larvae in different stage are higher than those of control groups when probiotic bacteria strains X4B-1 and X1B-1 which are isolated from gut of adult shrimp are added into the little volume rearing sea water of shrimp larvae. The effects of probiotic bacteria are evaluated by challenge test (pathogenic bacteria Z3G2 isolated from disease shrimp larvae in the hatchery of Jimo town) and low salinity stress resistance tests on shrimp larvae, the survival rate and lengths of the shrimp larvae in the experiment are determined. Results indicate that 1. The survival rate, ability of resistant to low salinity, lengths of the delivered shrimp larvae are improved after the strains of probiotic bacteria, X4B-1 or X1B-1, are added into the rearing sea water of hatchery. 2. The addition of the probiotic bacteria could not influence the change of the bacteria number, NH3-N and COD value in the rearing sea water. 3. The probiotic bacteria used in the experiment have many enzymes such as Lipase, Amylase, Gelatinase and Lecithinase. These enzymes may help the probiotic bacteria to digest the food components fed to shrimp larvae and increase the digestive efficiency of post larvae. This may be one of the reasons why these probiotic bacteria are beneficial to the shrimp larvae.     

Use of Probiotics in Aquaculture

Diseases of cultured animal and environmental pollution are very important problems in aquaculture.The use of probiotics in aquaculture has more advantages than the use of antibiotics and chemicals in aquaculture.This review introduces the use and mechaninsms of the probiotics in aquaculture.     

遗传学实验课程成绩评价体系的建立及分析

介绍了中国海洋大学通过多年遗传学实验教学实践,建立了一种科学、准确、客观、实时、公正的学生实验成绩评定体系;剖析了该方法对教学实践过程的导向作用;讨论了该评价体系在教学实践中的具体实施方法、技巧及思想。     

中国对虾成虾肠道微生物区系

对野生健康中国对虾成虾肠道生生物区系进行了研究。从其肠道中分离出４７株菌,它们分别属于弧菌属、发光杆菌属、不动杆菌属、似单胞菌属、黄杆菌属、气单胞菌属、屈挠杆菌属和色杆菌属８个属。其中胞菌属、屈挠杆菌属和色杆菌属的非优势菌属,不动杆菌属和假单胞菌属为次优势菌属,黄杆菌属、气单胞菌属、屈挠杜菌属和色杆菌属为非优势菌属。在对虾的整个肠道中,前肠和中肠的优势菌属为弧菌属,而后肠的优势菌属为发光杆菌属。在