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1.
中草药对牙鲆病原迟钝爱德华氏菌的体外抑制作用研究   总被引:9,自引:0,他引:9  
用倍比稀释法测定了30种中草药对牙鲆病原迟钝爱德华氏菌(LN031012-8,TH030908-5)菌株的体外抗菌活性。试验结果表明,五倍子、诃子、黄芩、秦皮和红藤的抑菌作用明显,最小抑菌浓度(MIC)<12.5 mg/ml,最小杀菌浓度(MBC)<50 mg/ml;丁香、穿心莲、虎杖、夏枯草等有一定的抑菌作用,MIC为50~100 mg/ml;而茵陈、鱼腥草、金银花、大青叶等的抑菌作用不明显,MIC均>100 mg/ml;五倍子、地榆、野菊花、马齿苋等中草药的体外抗菌活性表现了株间差异。  相似文献   

2.
20种中草药对迟缓爱德华氏菌的体外抑菌试验   总被引:1,自引:0,他引:1  
用琼脂扩散法和二倍稀释法测定了20种中草药对迟缓爱德华氏菌(Edwardsiella tarda)(GD080715-1、GD080715-2)的体外抗菌活性。结果表明,五倍子、乌梅、大青叶、石榴皮的抑菌作用明显,最小抑菌浓度(MIC)<6.25 mg/mL,最小杀菌浓度(MBC)<50 mg/mL;吴茱萸和菖蒲有一定的抑菌作用,MBC为50~100 mg/mL;而苦地丁、栀子的抑菌作用不明显,MBC>200 mg/mL。  相似文献   

3.
用琼脂扩散法和二倍稀释法测定了20种中草药对迟缓爱德华氏菌(Edwardsiella tarda)(GD080715-1、GD080715-2)的体外抗菌活性。结果表明,五倍子、乌梅、大青叶、石榴皮的抑菌作用明显,最小抑菌浓度(MIC)〈6.25 mg/mL,最小杀菌浓度(MBC)〈50 mg/mL;吴茱萸和菖蒲有一定的抑菌作用,MBC为50~100 mg/mL;而苦地丁、栀子的抑菌作用不明显,MBC〉200 mg/mL。  相似文献   

4.
9种中草药及17种组方对迟钝爱德华氏菌的体外抑菌试验   总被引:2,自引:0,他引:2  
采用M-H琼脂稀释法,测定了黄连、大黄、黄芩等9种中草药及其相互配伍组成的17种复方对迟钝爱德华氏菌的体外抗菌活性.结果表明,五倍子 黄芩、大黄 五倍子、黄芩 黄连和大黄 黄芩的抑菌作用明显,MIC和MBC值均≤3.125 mg/mL;而蒲公英、金银花、板蓝根、金银花 蒲公英和连翘 板蓝根的抑菌和杀菌作用则不明显,MIC和MBC值均≥200 mg/mL.大多数复方联用的效果明显好于单方试验结果,表现出协同作用.  相似文献   

5.
中华鳖爱德华氏菌病病原和组织病理研究   总被引:17,自引:4,他引:17       下载免费PDF全文
蔡完其 《水产学报》1997,21(4):428-433
从中华鳖病病鳖的肝脏分离得到菌株s-1。用菌株S-1进行人工感染,100%的鳖患病,从感染的病鳖的肝脏分离到菌株s’-1,经生理生化反应测定,它与菌株s-1特性一致。经鉴定,菌株s-1是迟钝爱德华氏菌,野生型。爱德华氏菌感染会引起鳖的脏器发生变质性病变。主要症状呈肝脏型,肝局部坏死,有结节状肉芽肿。  相似文献   

6.
结合专项试验的相关结果,围绕地中海鳎鱼饲养过程中的场地选择、鱼种运输、商品鱼养成等主要生产环节提出了实用技术要点,为在我国南方海区饲养该鱼提供参考.  相似文献   

7.
迟缓爱德华菌病,是由迟缓爱德华菌引起鱼类、牛蛙等水生动物疾病的统称,其中鱼类疾病有肠道败血症和肝肾坏死病、鳗赤鳍病、鳗臌胀病、鳗溃疡病、鳗肝肾病、鳗肝肾综合症等。迟缓爱德华氏菌还可引起人体肠炎、腹泻、脑膜炎、蜂窝组织炎、肝脓肿、败血症等症状。为我国的三类水生动物疫病。  相似文献   

8.
2022年3月,广东珠三角地区养殖的大口黑鲈(Micropterus salmoides)发生了大规模暴发性死亡,特别是佛山市南海区,死亡率高达20%~50%。为明确大口黑鲈死亡原因,采集佛山市南海区沙头镇腹部膨大和内脏缺血、体长25~35 cm濒死病鱼42尾,进行组织病理分析、病原分离与鉴定、病原菌毒力和耐药性检测等,为该病的诊断和防控提供科学依据。结果显示,病鱼主要临床症状为严重腹水、肝脏和鳃缺血以及肝脏和肾脏肿大。病理切片显示。肝脏和肾脏均严重组织变性和细胞坏死。从肝脾肾组织中均分离出大量菌落形态一致的细菌,其中肝组织细菌丰度最高。生化鉴定和16S r RNA分子鉴定结果表明:细菌S1为杀鱼爱德华氏菌(Edwardsiella piscicida),在系统进化树中与杀鱼爱德华氏菌(MN203719.1)自然聚为一支。动物回归感染实验表明该菌为引起大口黑鲈死亡的致病菌,且毒力很强。药敏试验结果显示,该菌对氟苯尼考、恩诺沙星、多西环素等药物敏感,对利福平、阿莫西林、四环素耐受。  相似文献   

9.
鲤鱼爱德华氏菌败血症的诊断和防治   总被引:3,自引:0,他引:3  
1材料方法1.1材料来源从东樟乡渔场,取病鲤鱼8尾,均重550克,在水温27±1℃水族箱中暂养8小时备用。1.2病原鉴定取鲤鱼腹水,肝组织直接划线接种营养琼脂平板DHL。琼脂平板经30℃、24小时培养,各长出形态一致的菌落,经生化鉴定为缓慢爱德华氏菌(野生型),该菌在营养琼脂上的菌落为半透明、灰白色、圆整湿润,直径1~1.5毫米。在DHL琼脂上的菌落为透明,中央有黑心,直径0.5~1毫米,生化特征:葡萄糖、麦芽糖、阿拉伯糖、赖氨酸等MRH—S均阳性。动力试验:乳糖、蔗糖、西蒙氏枸缘酸、醋盐酸、甘露醇、…  相似文献   

10.
牛蛙爱德华氏菌病病原菌的鉴定和致病因素的研究   总被引:5,自引:1,他引:5       下载免费PDF全文
从患爱德华氏菌病的牛蛙肌肉、肝、肾、血液和腹水中分离到8株细菌,根据其形态和生理生化特性鉴定为野生型迟钝爱德华氏菌。人工感染实验均为该病的病原菌,毒素检测试验表明,致病因素主要是内毒素而不是外毒素。分离菌株的主要特性为杆状、革兰氏阴性、周生鞭毛、兼性厌氧。接触酶、甲基红试验和硝酸盐还原均为阳性。在三糖铁琼脂上产H2S。氧化酶、丙二酸盐利用、V.P试验、明胶液化、尿素酶。苯丙氨酸脱氨酶为阴性。分解葡萄糖、甘露糖、麦芽糖,产酸产气,不利用甘露醇、蔗糖和阿拉伯糖。  相似文献   

11.
牙鲆病原迟钝爱德华氏菌的药物敏感性测定与分析   总被引:2,自引:0,他引:2  
对分离并经鉴定的牙鲆病原迟钝爱德华氏菌进行了常用抗菌类药物的敏感性测定,结果表明供试的35株迟钝爱德华氏菌,均对所测定的37种抗菌类药物中的头孢唑啉等20种药物高度敏感、对青霉素G等5种药物耐药、对氨苄青霉素等12种药物表现在株间存在差异。  相似文献   

12.
    
Enteric septicemia of catfish (ESC), caused by the gram-negative enteric bacteria Edwardsiella ictaluri, is a significant threat to catfish aquaculture in the southeastern United States. Antibiotic intervention can reduce mortality; however, antibiotic use results in an imbalance, or dysbiosis, of the gut microbiota, which may increase susceptibility of otherwise healthy fish to enteric infections. Herein, recovery of the intestinal microbiota and survivability of channel catfish in response to ESC challenge was evaluated following a 10-day course of florfenicol and subsequent probiotic or prebiotic supplementation. Following completion of florfenicol therapy, fish were transitioned to a basal diet or diets supplemented with a probiotic or prebiotic for the remainder of the study. Digesta was collected on Days 0, 4, 8 and 12, beginning on the first day after cessation of antibiotic treatment, and gut microbiota was characterized by Illumina sequencing of the 16S rRNA gene (V4 region). Remaining fish were challenged with E. ictaluri and monitored for 32 days post-challenge. Florfenicol administration resulted in dysbiosis characterized by inflated microbial diversity, which began to recover in terms of diversity and composition 4 days after cessation of florfenicol administration. Fish fed the probiotic diet had higher survival in response to ESC challenge than the prebiotic (p = .019) and negative control (p = .029) groups.  相似文献   

13.
以江苏省吴江市八坼镇区域养殖场加州鲈鱼病鱼的细菌性病原体为研究对象。通过分离纯化,形态学观察,结合16S rRNA基因序列同源性检索,对该病原菌进行初步判断。同时进行药敏实验,了解该病原菌对各种抗生素的耐药性和敏感程度。研究结果:分离纯化得到2株纯菌株L2F和L2P2,革兰染色均呈红色,阴性杆状菌。16S rDNA序列分析,L2F和L2P2菌株与迟缓爱德华氏菌(Edwardsiella tarda)的同源性达99%。初步判断该菌为迟缓爱德华氏菌。药敏实验结果,该菌对磺胺异恶唑、链霉素和利福平等药物不敏感或耐药,对左氧氟沙星、诺氟沙星、恩诺沙星、强力霉素、氟苯尼考、头孢哌酮相对敏感。  相似文献   

14.
    
Edwardsiella tarda is a pathogen that causes edwardsiellosis in aquatic animals. The emergence of multiple antibiotic‐resistant strains makes antibiotic treatment difficult. This study aimed to investigate the antibiotic susceptibility patterns and the genotypic characterization of E. tarda isolated from cage‐cultured red tilapia in Thailand. A total of 30 isolates were identified as E. tarda using biochemical and molecular analysis. The disc diffusion method for testing antibiotic susceptibility showed all the isolates were resistant to colistin sulphate and oxolinic acid. High levels of resistance to amoxicillin, ampicillin, ceftazidime, oxytetracycline and sulphamethoxazole/trimethoprim were observed as well. The multiple antibiotic resistance index ranged from 0.25 to 0.92, indicating that these isolates had been exposed to high risk sources of contamination where antibiotics were commonly used. All the isolates carried the blaTEM gene based on polymerase chain reaction (PCR). The tetA and sul3 genes were detected in 90% (27/30) and 26.7% (8/30) of the isolates respectively. Nine different genetic groups of isolates were obtained using enterobacterial repetitive intergenic consensus polymerase chain reaction (ERIC‐PCR). A correlation between genetic types and multiple antibiotic‐resistant patterns was found. These results highlight the potential risks of multiple antibiotic‐resistant isolates for humans and the environment.  相似文献   

15.
鳗鲡爱德华氏病病原菌及一新种   总被引:16,自引:2,他引:16       下载免费PDF全文
王国良  徐兴林  路正 《水产学报》1993,17(3):224-229
本文报道在我国浙江省发现的鳗鲡爱德华氏病病原菌特征。从患病鳗鲡内脏分离到9株菌,用其中的E895205等4株菌进行人工感染,死亡率均为100%,与自然发病症状相似。这些菌株的特征一致。均为G~-短杆菌,单个,周鞭毛,兼性厌氧,发酵葡萄糖产酸产气。氧化酶阴性,接触酶阳性,产H_(?)S。不能利用柠檬酸盐和丙二酸盐作为唯一碳源,鸟氨酸和赖氨酶脱羧酶阳性。属爱德华氏菌属细菌。比较已报道的四个种,认为E895205等菌株为一新种,定名为浙江爱德华氏菌(Edwardsiella zhe jiangensis sp. nov.)。  相似文献   

16.
    
There is a trend toward the increased incidence and prevalence of Edwardsiella piscicida septicemia in US catfish aquaculture, particularly in channel ♀, Ictalurus punctatus, × blue ♂, I. furcatus, hybrid catfish. From 2013 to 2017, a total of 3242 disease case submissions were made to the Aquatic Research and Diagnostic Laboratory (ARDL) at the Thad Cochran National Warmwater Aquaculture Center in Stoneville, MS. Of these, 1400 (43.2%) were hybrids. E. piscicida was suspected in 138 (4.3%) of cases, the majority of which (89.1%) were from hybrid catfish. A molecular survey of these isolates confirmed the majority (92.0%) to be E. piscicida. Furthermore, cases of E. piscicida from hybrids submitted to the ARDL and the Aquatic Diagnostic Laboratory of the Mississippi State University College of Veterinary Medicine in Starkville, MS, were documented for gross lesions and histological analysis. Grossly, E. piscicida presents with small dermal ulcerations, a raised fluid‐filled cranial midline lesion that is frequently ulcerated, hemorrhage in the gills, exophthalmia, and abdominal distension. Internally, lesions include splenomegaly, straw‐colored ascites, renomegaly, and occasionally hemorrhagic intestines. Histopathological examination is in agreement with gross observations, and infected fish repeatedly demonstrate a mononuclear meningoencephalitis, hemorrhagic branchitis, splenitis, ulcerative dermatitis, granulomatous interstitial nephritis, and hepatitis coupled with a hemorrhagic enteritis.  相似文献   

17.
依据中国和挪威联合进行的黄东海渔业资源声学评估调查资料,并结合历史研究成果,分析了对鱼行动分布有着显著影响的三大水系(黄海冷水团、黄海暖流和苏北沿岸冷水)的变化特征。结果表明,三大水系均具有明显的年际变化。(1)黄海冷水团的温盐性质比较稳定,但其相对体积强年(1986年11月)约为弱年(985年11月)的144倍;(2)黄海暖流的流速强年(1986年1月)约为弱年(1992年正月)的1.21倍;(3)苏北沿岸冷水以3月份势力最强,其强度1985年1月大于1986年1月。  相似文献   

18.
    
The present experiment was conducted to evaluate the efficacy of an additive derived from the nature as an alternative of dietary antibiotic in Japanese eel, Anguilla japonica. Six experimental diets were formulated to contain no antibiotics or additive (yellow loess/YL) (control/CON), three graded levels of yellow loess at 5 (YL5), 10 (YL10) and 20 g/kg (YL20), oxytetracycline at 5 (OTC) and amoxicillin at 10 g/kg amoxicillin (AMX) of diet. Weight gain (WG) and specific growth rate (SGR) from fish fed CON or YL5 diets were significantly lower than those of fish fed YL20 or OTC diets. Among non‐specific enzyme, lysozyme activity of fish fed YL20, OTC or AMX was detected to be significantly higher than that from fish fed CON or YL5 diets, whereas superoxide dismutase (SOD) activity of the fish fed CON was significantly lower than that for fish fed other experimental diets. Challenge test with bacteria, Edwardsiella tarda, showed improved disease resistance among the fish fed different levels of natural additive without any statistical difference from those fed antibiotics (OTC and/or AMX) supplemented diets. Therefore, these results demonstrated the potential of natural feed additive, yellow loess to replace oxytetracycline and/or amoxicillin in Japanese eel, A. japonica.  相似文献   

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