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1塘口条件 1.1 每块养殖稻田面积以1 hm2左右为宜,配套进排水系统,土质以壤土、粘土为佳.可以利用单个田块养蟹,也可集中连片发展养殖. 相似文献
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1壳聚糖的来源 壳聚糖(Chitosan)是甲壳素脱乙酰基的产物.壳聚糖广泛存在于低等植物、菌类、藻类的细胞中,节肢动物虾、蟹、蝇蛆和昆虫的外壳,贝类、软体动物(如鱿鱼、乌贼)的外壳和软骨,高等植物的细胞壁,每年生物合成的资源量高达100亿t,是地球上仅次于植物纤维的第二大生物资源. 相似文献
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2005年3月8日,洪泽县在电力宾馆召开有机水产品颁证大会.洪泽县各镇党政主要负责人、分管水产的负责人、水产站站长、水产重点村村支部书记、渔场场长、水产养殖大户、水产经纪人代表近200人参加了会议.原国家经贸委企业改革司王世宽司长,北京五岳华夏管理技术中心管委会王德良秘书长,淮安市人民政府朱毅民副市长,中国科学院研究生院教授、中科院水生所汪建国研究员,南京农业大学无锡渔业学院教授、中国水产科学研究院淡水渔业研究中心周鑫研究员,江苏省洪泽湖渔管会办公室沈国华主任,淮安市林牧渔业局胡锦农局长和洪泽县县委、县政府、县人大、县政协有关领导出席了会议. 相似文献
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泥鳅养殖技术 总被引：1，自引：0，他引：1
泥鳅肉质细嫩,肉嫩鲜美,有调中益气、解渴、醒酒、利便、壮阳等功效,在日本、韩国市场上素有“水中人参”之称,价可高达4美元/kg。养殖泥鳅具有产量高、疾病少、饲料来源广、成本低、效益高的特点,是农业产业结构调整,农民朋友一条很好的致富门路。现将养殖技术介绍如下:1池塘条件苗种培育以土池为好,面积以30~100m2为宜,池深40~60cm。养殖成鳅的池塘以100~250m2,池深70~100cm,水深40~50 cm,土池、水泥池均可。如水泥池池底要铺上20 cm厚的泥土。无论苗种池还是成鱼池,池中要挖鱼溜,以利其栖息和避暑防寒,池埂池底铺垫15~20 cm淤泥层,池中投… 相似文献
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深秋十月,禾熟蟹黄蚝飘香.每年农历10月起至翌年清明节前后一段时间,是阳西县程村镇沿海蚝农们丰收喜庆且最为繁忙的日子.这个季节,走进被誉为"蚝乡"的程村镇红木山村,到处都是一派繁华的景象,蚝农们男女老少,家家出动,或起蚝、或开蚝、或制蚝鼓、蚝油、或载蚝、或驾车前往各地销售,全国各地商贩会聚程村,南腔北调,与当地口音互相混杂,成为一道独特而亮丽的风景线…… 相似文献
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从九月下旬开始,一帮当代人频繁活跃在市场上,以口水为导向,用笔记录行业进程。一行五人,三女两男进驻行程第一站——海南。九月份的海南烈日当 相似文献
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F. Lahnsteiner 《Aquaculture Research》2000,31(3):245-258
The present paper summarizes the data on a semen cryopreservation method for the Salmonidae (Oncorhynchus mykiss, Salmo trutta f. lacustris, Salvelinus fontinalis, Salvelinus alpinus, Salmo trutta f. fario, Hucho hucho, Coregonus lavaretus, Thymallus thymallus) and for the Northern pike (Esox lucius) published during recent years. It describes (1) methods used for the determination of sperm viability; (2) the protective efficiency of substances specifically for protection of internal and external parts of cells and the process of extender development; (3) the freezing, thawing and fertilization conditions; and (4) the tolerable deviations from the freezing protocol for more easy application. Finally, biomarkers are reported that predict the suitability of semen for cryopreservation and the quality of frozen–thawed semen. 相似文献
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Underlying principle for fluid therapy is the knowledge about distribution of body water (60% of body weight) into compartments: intra- and extracellular fluid (ICF, ECF) cover respectively one half, one sixth of the latter fills the intravascular system. According to the concentration of ions and molecules in the lost fluids, dehydration is classified into hypertone, hypotone and isotone. Clinical assessment and laboratory examination (PCV, hemoglobin, total protein, urine analysis, electrolyte and blood gas evaluation) are crucial features for determination of dehydration rate, acid-base and electrolyte imbalances. Derangements of body-fluid and electrolyte metabolism and their treatment are discussed. The quantity of fluids necessary for rehydration of the patient is calculated on the basis of clinical findings. Overhydration risk has to be considered more seriously in cats than dogs. Intravenous, subcutaneous, oral and intraperitoneal infusions are feasible. A survey to technical aspects and required instruments is presented in conclusion. 相似文献
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The pharmacokinetics of antiepileptic drugs used for the treatment of human epilepsies is reviewed for dogs and cats. In dogs, especially phenobarbital and primidone must be regarded as useful drugs for chronic treatment on account of their elimination rate and bioavailability. Phenytoin, carbamazepine, valproic acid and benzodiazepines are eliminated so rapidly that a therapeutic value cannot be expected. In cats, phenytoin, phenobarbital, valproic acid and diazepam must be regarded as suited for chronic treatment, but there is a definite lack of clinical experience. Phenobarbital and primidone are useful for treatment of clonic-tonic generalized seizures (grand mal) in dogs. The effect of primidone depends mostly on its metabolite phenobarbital. Since primidone, given in high dosage for longer periods of time, gives rise to liver damage, phenobarbital is regarded as the drug of first choice. A status epilepticus may be treated by i.v. injection of diazepam, clonazepam, phenytoin or lidocaine. In cats with grand mal, treatment with daily doses of about 1 mg/kg diazepam may be tried. It proved effective for longer time periods without development of tolerance. There is no reliable clinical experience with other drugs in this species. 相似文献
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大气中的有机胺具有潜在的气候效应,这是当今国际的研究热点之一。海洋是大气中有机胺的重要来源,但由于海水中有机胺检测难度较大,导致海洋环境中有机胺的产生机制尚不清楚。本文概述了海洋生物体内有机胺前体物的浓度特征及其对环境中有机胺的影响,阐述了沉积物、海水及大气中有机胺的浓度特征,分析了海洋大气气溶胶中有机胺的形成途径,并指出海水中有机胺检测的难点及现阶段亟待解决的科学问题。为深入认识海洋环境中有机胺的迁移转化规律及其潜在气候效应提供科学依据。 相似文献
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依据在2000年10-11月和2001年3-4月两个航次采集的浮游动物样品,对南黄海和东海陆架区磷虾的数量分布进行了研究.共发现9种磷虾,其中以太平洋磷虾(Euphau.sia pacifica)、中华假磷虾(Pseudeuphausia sinica)和宽额假磷虾(Pseudoeuphausia latifrons)占优势.这3个优势种有各自的分布区,分别代表着3个不同的生态类型.太平洋磷虾是最主要的优势种,分布在黄海中央和东海北部的低温高盐水域.其在两个航次中的高丰度(＞1000 ind·m-2)区都有底层冷水(＜12℃)出现.中华假磷虾分布在长江冲淡水及其南北两侧的近岸低盐(24～33.5)水域.秋季航次最高丰度为280 ind·m-2,出现在长江口,盐度仅24～27.宽额假磷虾仅见于秋季航次,分布在黑潮和台湾暖流影响下的高温(＞21℃)高盐(＞33.5)水域,最高丰度为160 ind·m-2.其它6种磷虾数量稀少,除小磷虾(Euphausia nana)外均为暖水性种类. 相似文献
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An adenoma and an adenocarcinoma of the anterior uvea in two dogs are described clinically--follow-up included--and ophthalmopathologically. Incidence, therapy, differential diagnosis and prognosis of these epithelial neoplasms in the anterior uvea are discussed. 相似文献
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饲料中铁元素含量对鱼菜共生系统水质及鱼菜生长的影响 总被引：1，自引：0，他引：1
通过控制饲料中铁元素含量,研究其对鱼(金鲫)、菜(红皱生菜和红油阿拉斯)生长和系统水质的影响。实验设置1个对照组和5个处理组,饲料铁含量分别为0、0、10、20、40和80 mg/kg。结果显示:该系统对水体质量有净化作用;不同铁含量对金鲫存活率影响不显著(P0.05),对增重率影响显著(P0.05);当饲料中铁含量为20 mg/kg时,金鲫鱼存活率和鱼体增重率均达到最大值;饲料中铁含量为80 mg/kg时,金鲫的存活率和增重率均出现下降趋势;饲料中不同铁含量对两种蔬菜的存活率和增重率均没有产生显著影响(P0.05),但在增重率方面有一定的差异。研究表明:饲料中添加铁元素能够促进金鲫和蔬菜的生长,当铁元素含量为20 mg/kg时,该鱼菜共生系统具有最佳的生产力。 相似文献