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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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The variation of virulence of Renibacterium salmoninarum , the causative agent of bacterial kidney disease (BKD) in salmonid fish, was studied by infecting rainbow trout, Oncorhynchus mykiss (Walbaum), with two isolates (strains 325 and 932) from diseased Atlantic salmon, Salmo salar L., and one isolate (strain 4366) from an apparently healthy Atlantic salmon. Coho salmon, Oncorhynchus kisutch (Walbaum), were injected with the strain 932 to estimate difference in fish species resistance. Fish were removed by random sampling for other study purposes, a study design possible with analysis of lifetime distributions incorporating both sampling-, death- and survival-times. At the end of the experiment, the rainbow trout infected with strains 325, 932 and 4366 had a survival probability of 33%, 51% and 72%, respectively. The coho salmon infected with strain 932 had a 26% survival probability. The strain differences were significant according to the log-rank test, and the risk ratio between the strains ranged from 1·8 to 5·4. The strain from the apparently healthy fish was least virulent. The survival of the fish species was different over time. Rainbow trout were more likely to die early in the time course, but high numbers of coho died later, resulting in an overall risk of mortality of 1·4 in favour of rainbow trout. Differences in virulence may reflect changed selective pressure on R. salmoninarum when introduced from feral stocks into the environment of fish farms. 相似文献
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水硬度对七彩神仙鱼幼鱼发育的影响 总被引:4,自引:0,他引:4
采用不同硬度的水对七彩神仙鱼幼鱼进行饲养。6周龄幼鱼在硬度为7.94°dH±0.30°dH时饲养84d后,比在硬度为14.71°dH±0.23°dH水中的幼鱼个体大,生长速度快。表明较高硬度的水有利于七彩神仙鱼幼鱼的生长发育。 相似文献
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牙鲆刺激隐核虫病的防治 总被引:1,自引:0,他引:1
2005年七、八月份,乐亭、滦南一带多家工厂化牙鲆养殖场发生刺激隐核虫病,此种病虫害发病急、传染快、死亡率高。发生过该病的养殖场牙鲆死亡率一般都在50%~80%之间,这种病害给牙鲆养殖业带来很大损失。 相似文献
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《水生生物资源》2003,16(5):461-465
Anti-proteinase activity was demonstrated in the seminal plasma of cyprinid fish species (bream, chub, ide, dace, asp, goldfish, roach, common carp) using electrophoretic techniques combined with a detection method based on inhibition of bovine trypsin. We found species-specific protease inhibitors in the seminal plasma of cyprinids. At least three bands of protease inhibitors with different migration rates could be identified by native PAGE. Higher variability was characterized for bands with slower migration rates. Visualization of inhibitors after SDS-PAGE under non-reducing conditions allowed estimation of their molecular weights. Apparent molecular weights were within the range of 51–59 and 47–54 kDa for the bands with slower and moderate migration rates, respectively. The molecular weight of fast migration bands for roach and common carp were estimated to 23 and 30 kDa, respectively. Inhibitors of common carp seminal plasma differed in their affinity toward serine proteases. Three inhibitors in common carp seminal plasma could be visualized using cod and bovine trypsin, but only two inhibitors (of high molecular weight) were recognized with chymotrypsin. There were differences in anti-proteinase activity and seminal plasma protein concentration in relation to the origin of common carp seminal plasma (breeding lines) and time of milt collection (spawning vs. post-spawning season). 相似文献
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七种甲壳类水产品脂肪酸组成的分析研究 总被引:5,自引:0,他引:5
水产动物食品中富含ω—3型多稀酸,其中尤其是C_(20:5)(EPA)和C_(22:6)(DHA)对人体有特殊保健功能。本文对七种常见的甲壳类水产品进行脂肪酸组成分析,它们是中国对虾、日本沼虾、安氏白虾、克氏原螫虾、葛氏长臂虾、中华绒螯蟹和三寺疣梭子蟹。测定主要采用黄志斌、李淡秋(1990)的“快速制备脂肪酸甲酯用于气相色谱分析”一文所提供的方法。结果显示,被测样品中不饱和脂肪酸含量高于饱和脂肪酸,而不饱和脂肪酸中多烯酸含量高达60%,且以长碳链(C_(20)、C_(22))ω—3型为特征,表明甲壳类水产品体脂中EPA和DHA含量甚高,超过淡水鱼的一倍,但略逊于海水鱼。值得注意的是,甲壳类水产品中EPA的含量高于DHA的含量,这与鱼类中的情况正好相反。 相似文献
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该研究通过肉眼观察、镜检,进行干露、饥饿、盐度突降、福尔马林等抗性试验,并采用病毒检测等方法,以期建立评估斑节对虾(Penaeus monodon)虾苗活力和质量标准。结果表明,斑节对虾健康虾苗具有趋光性、集群性,体表光洁,肌肉透亮,肠胃食物充盈等特性。测试虾苗干露时间以15min为宜,健康虾苗干露后能立即恢复活力,而病弱虾苗多出现死亡、昏迷现象;虾苗的成活率随饥饿时间的延长而降低,随福尔马林浓度升高和时间延长而降低,随盐度突降幅度增加而降低。健康虾苗能忍受100~200μL·L^-1福尔马林溶液30min,成活率近100%;在盐度20~30下虾苗的成活情况较好,而其在淡水中仅能存活1h。对虾苗进行病毒检测,可以避免养殖中因虾苗携带病毒而可能导致的病毒性疾病的暴发。 相似文献
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鳟鱼发眼卵和旨种运输是养鳟生产的重要环节。发眼卵多在冬季和早春运输,苗种多在晚春和夏季运输。苗种运输大多以鱼篓充氧进行短距离汽车运输,长途运输冷水性鱼苗种的实例很少。本文总结了金鳟和虹鳟苗种长途运输方法,以期与养鳟业界共同交流提高。一、包装材料和方法内包装材料是苗种运输专用塑料袋,规格54×104cm,外包装是泡沫塑料箱,规格63.5×45.5×30.5cm,纸箱规格64×46×32.5cm。塑料袋采取双层式,内装苗种和水共12.5kg,其中苗种0.5-1.3kg,100-2000尾。起运前苗种停食1-2天。运鱼用水水温调至6℃,鱼、水入袋后袋内… 相似文献
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猪的胎盘属于弥散型胎盘,这种胎盘的结构特点和饲养管理的不当,常常导致母猪胎衣不下发生,给生猪的生产繁殖带来极大损失。本文针对母猪胎衣不下发生病因、综合防治进行详细阐述,旨在对预防和治疗胎衣不下能有所帮助。 相似文献