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近些年,随着社会经济的快速发展,我国的养殖业发展规模越来越大,也获得许多人的青睐,其中罗非鱼在近几年的养殖规模迅速扩大,市场的需求量也显著增加,罗非鱼在市场中供不应求,因此也导致罗非鱼的价格暴涨。但因近些年水质环境发生很大变化,罗非鱼在养殖过程中出现了许多养殖病害,导致大量罗非鱼死亡,对鱼类养殖业者带来较大的经济损失。为了有效提高罗非鱼的养殖经济效益,下面针对罗非鱼养殖常见疾病的防治和治疗措施进行阐述。 相似文献
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要想真正实现健康养鱼,需要在许多养鱼环节上进行科学计算、严格执行,如罗非鱼目前在我国养殖比较广泛,是许多地方水产养殖的主要品种. 相似文献
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兰作友 《畜牧兽医科技信息》2015,(1)
<正>大规格罗非鱼属于热带鱼类,适应性广,生长快,抗病能力强,群体产量高,肉质鲜美,赢得了出口加工企业和广大消费者的青睐,不仅市场前景广阔,还能增加当地渔农收入,是理想的生产养殖项目。下面结合广西柳江县实际,探讨大规格罗非鱼养殖技术。1大规格罗非鱼品种选择及培育大规格罗非鱼养殖的关键是科学选定良种,要在几个月内就养殖出优质大规格罗非鱼商品鱼,需要选择体格健壮、品种纯正、规格整齐较大的罗非鱼品种,当前广西柳江县可 相似文献
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福建主要水产动物病害防治研究概况 总被引：1，自引：0，他引：1
随着我国人民生活水平的不断提高，水产品消费市场日益扩大，水产养殖业在大农业中的比重不断提高。水产业已成为福建农业的主导产业，据统计，2005年福建省水产养殖总产量达602．2万t，居全国第三位，人均水产品占有量186 kg，为全国之最。随着天然水产资源日益枯竭，水产捕捞将受到严格控制的情况下，为满足市场需求，大力发展水产养殖业已显得更为迫切。同时，福建省还是水产品出口创汇大省，2005年水产品出口24．7万t，出口创汇8．55亿美元，居全国第五位，出口创汇占全省农产品出口创汇的43．6％以上，在大农业中具有明显的优势和潜力。尤其是福建省具有得天独厚的亚热带海洋性气候，适合养殖的名特水产动物品种众多，除鳗鲡外，还有大黄鱼、鲍鱼、虾、甲鱼、罗非鱼等，出口呈现稳步发展势头。 相似文献
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罗非鱼是近些年国内推出的名优水产品种,有着不错的养殖效益回报.为此,更多跟风养殖罗非鱼的人越来越多.但是,从反馈的养殖效益来看,普遍经济效益不高.文章以提升罗非鱼养殖效益为研究出发点,分析罗非鱼养殖效益不高的原因——水池不利罗非鱼养殖、鱼苗放养管理不善、投饵施肥不合理、防护安全管理不善等等.针对这些问题,笔者就提升罗非鱼养殖效益的技术措施,自挑选好养殖水池,做好消毒杀病虫害;掌控好放养时间,确保上市后有好行情;做好鱼苗选购工作,做好鱼苗放养管理;做好饵料投喂工作,注意池内水质配肥;优化池内养殖管理,调理水池水肥条件等方面做出概述,要点性知识以供参考和借鉴. 相似文献
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黄淇松 《养殖与饲料．饲料世界》2022,(1)
罗非鱼是一种产自非洲的热带性鱼类,因具有生成快和产量高等特点,在鱼类销售市场上需求量较大,逐渐形成了专门养殖和捕捞的产业链。为促进罗非鱼养殖产业的可持续发展,本文以广西罗非鱼养殖生产情况为例,介绍了广西罗非鱼养殖生产和经营管理方面存在的问题;提出了广西罗非鱼养殖管理的对策:加强病害攻关、规范标准化养殖生产,持续扩大市场、改良技术化经营模式。 相似文献
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近几年，广东的罗非鱼产业发展很快，在广州、茂名、湛江等地，80％以上的淡水鱼养殖都是罗非鱼。预计，广东省罗非鱼养殖面积已经超过60万亩，2010年产量近60万吨。罗非鱼养殖的发展带动了与之相关的种苗、饲料、水产品加工及贸易的发展，涌现出了一批从事罗非鱼养殖、加工和出口的企业。 相似文献
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张金宗 《养殖与饲料．饲料世界》2004,(2):42-42
有2003年的“全国农业科技年”中,增城市水产部门把在全市实施“一条鱼(罗非鱼)3.5万亩养殖工程”当作培育优势水产品和优势产区规模养殖,紧盯市场,扬长避短,充分发挥比较优势,实施科技行动提升优势水产品竞争力,不断增强企业(养鱼户)的造血功能和提高水产品出口香港等国际市场竞争力,总产量24500吨(其中罗非鱼产量17650吨),总产值2.25亿元,实现了渔业增产增效,渔民增收,渔农业和农渔村经济社会稳定发展的目标。 相似文献
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Breed differences for weight (CW), height (CH), and condition score (CS) were estimated from records (n = 12,188) of 2- to 6-yr-old cows (n = 744) from Cycle IV of the U.S. Meat Animal Research Center's Germplasm Evaluation (GPE) Program. Cows were produced from mating Angus and Hereford dams to Angus, Hereford, Charolais, Shorthorn, Galloway, Longhorn, Nellore, Piedmontese, and Salers sires. Samples of Angus and Hereford sires were 1) reference sires born from 1962 through 1970 and 2) 1980s sires born in 1980 through 1987. The mixed model included cow age, season of measurement and their interactions, year of birth, pregnancy-lactation code (PL), and breedgroup as fixed effects for CW and CS. Analyses of weight adjusted for condition score included CS as a linear covariate. The model for CH excluded PL. Random effects were additive genetic and permanent environmental effects associated with the cow. Differences among breed groups were significant (P < 0.05) for all traits and were maintained through maturity with few interchanges in ranking. The order of F1 cows for weight was as follows: Charolais (506 to 635 kg for different ages), Shorthorn and Salers, reciprocal Hereford-Angus (HA) with 1980s sires, Nellore, HA with reference sires, Galloway, Piedmontese, and Longhorn (412 to 525 kg for different ages). Order for height was as follows: Nellore (136 to 140 cm), Charolais, Shorthorn, Salers, HA with 1980s sires, Piedmontese, Longhorn, Galloway and HA with reference sires (126 to 128 cm). Hereford and Angus cows with reference sires were generally lighter than those with 1980s sires. In general, breed differences for height followed those for weight except that F1 Nellore cows were tallest, which may in part be due to Bos taurus-Bos indicus heterosis for size. 相似文献
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In experiment 1, 6 pregnant mares received a concentrate that contained a trace mineral premix that provided 14.3 mg Cu, 40 mg Zn, 28 mg Fe, 28 mg Mn, 0.08 mg Co, 0.16 mg I, and 0.16 mg Se/kg concentrate (group A). Seven mares received the same concentrate plus 502 mg Zn and 127 mg Cu once daily (group B). No differences (P > .05) in foal growth data, or Cu, Zn, and Fe concentrations of mare milk, mare serum, or foal serum were observed. In experiment 2, 6 pregnant mares received the same concentrate as group A (group C), and 8 mares received the same concentrate fortified with 4× the trace mineral premix (group D). Group C mares had higher serum Zn concentration at 1 day (P < 0.01) and 56 days (P < 0.04). Group C mares had higher milk Fe concentration at 28 days (P < .01), and group D mares had higher milk Cu concentration at 56 days (P < .01). Group C foals had higher serum Cu concentration at 14 days (P < .03). The results from this study provide no evidence to indicate that supplementing late gestating and lactating mares with higher dietary trace mineral levels than those recommended currently by NRC has any influence on foal growth and development, or on the Cu, Zn, and Fe concentrations of the mare milk, mare serum, or foal serum. 相似文献
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Nadine Pa?lack Barbara Mainzer Monika Lahrssen-Wiederholt Helmut Schafft Richard Palavinskas Angele Breithaupt Jürgen Zentek 《Journal of veterinary science (Suw?n-si, Korea)》2015,16(1):57-66
This study was conducted to measure the concentrations of strontium (Sr), barium (Ba), cadmium (Cd), copper (Cu), zinc (Zn), manganese (Mn), chromium (Cr), antimony (Sb), selenium (Se), and lead (Pb) in canine liver, renal cortex, and renal medulla, and the association of these concentrations with age, gender, and occurrence of chronic kidney disease (CKD). Tissues from 50 dogs were analyzed using inductively coupled plasma mass spectrometry. Cu, Zn, and Mn levels were highest in the liver followed by the renal cortex and renal medulla. The highest Sr, Cd, and Se concentrations were measured in the renal cortex while lower levels were found in the renal medulla and liver. Female dogs had higher tissue concentrations of Sr (liver and renal medulla), Cd (liver), Zn (liver and renal cortex), Cr (liver, renal cortex, and renal medulla), and Pb (liver) than male animals. Except for Mn and Sb, age-dependent variations were observed for all element concentrations in the canine tissues. Hepatic Cd and Cr concentrations were higher in dogs with CKD. In conclusion, the present results provide new knowledge about the storage of specific elements in canine liver and kidneys, and can be considered important reference data for diagnostic methods and further investigations. 相似文献
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《饲料工业》2019,(18):54-58
应用电感耦合等离子-质谱技术(ICP-MS),建立饲料中钠、镁、铬、锰、铁、铜、锌、砷、硒、镉和铅等元素的测定方法。对饲料样品的前处理方法、仪器工作参数和11种元素标准曲线进行优化;并以加标回收、分析方法比对和重复测试说明方法的准确性和精密性。方法在0～1 000 ng/ml范围内线性良好,仪器检出限为0.557 7～5.072 ng/ml,具有良好的精密度,其回收率在88.1%～104.4%之间,相对标准偏差小于5.0%。同时与原子吸收和原子荧光方法进行比对,测定结果相近。所建立的方法简单、快速,可替代原子吸收和原子荧光方法测定饲料中的11种金属元素,为饲料的质量控制提供理想的元素分析方法。 相似文献
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K Reifenberg M Stahl U L?sch 《Zentralblatt für Veterin?rmedizin. Reihe B. Journal of veterinary medicine. Series B》1989,36(3):191-198
A simple two step procedure for the isolation of caprine, ovine, bovine, equine, canine, porcine and human peripheral blood granulocytes is described. After enrichment of granulocytes by centrifugation, contaminating erythrocytes are lysed hypotonically. Recovery, purity, and viability of the granulocyte suspensions are determined. FACScan analysis of the cell suspensions measuring cellular size by forward and sideward light scatter is compared with the corresponding analysis of whole blood leukocytes. Constituencies of the isolated cell suspensions and loss of granulocyte subpopulations through isolation procedure is discussed with regard to granulocyte function assays. 相似文献
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《The Journal of small animal practice》1975,16(1-12):143-154
Circular excised skin wounds in the thoracic and metatarsal regions of the dog were studied. A similar sequence of events took place in the two regions although differences did occur due to the different reactions of the tissues which surrounded the wounds. None of the wound cavities became filled with exudate during the early stages of healing. In the thoracic wounds the cavities were largely filled by the swelling and inward movement of adipose tissue. Epithelium first grew on the wound surface in the sector of the wound that was situated in the direction of hair flow. The average time to complete epithelization was similar in both sets of wounds. A zone of alopecia developed around the wounds. 相似文献