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开春又到了把竿垂钓的黄金季节,诸多垂钓经营者开始积极筹备今年的垂钓计划,准备在眼下方兴未艾的"垂钓热"中再打一个漂亮仗.的确,随着人们生活水平的不断提高,垂钓业因其休闲娱乐性,在全国各地掀起一阵阵的"垂钓热",它不仅成为人们休闲度假的重要方式,也成为渔民致富的一种重要途径.但是,随着垂钓业在各地不断膨胀、扩展,导致竞争加剧,诸多经营者不惜采取降低垂钓价格乃至低价购入劣质鱼以供垂钓的投机方法,在激烈的市场竞争中死守硬拼,苟延残喘.殊不知,这样不但使自身的利润空间越来越小,而且使垂钓品种的品质不断下降,更重要的是使垂钓者的兴趣不断萎缩,最终,自身的市场失守,垂钓市场的优势也随之荡然无存.所以,在当前的垂钓经营筹备中,应看清垂钓市场发展的新趋势,迅速转型,因时制宜,走特色路,打优势牌,实现垂钓业提档升级,提质增效,提速发展.笔者结合当前实际,谈几点看法. 相似文献
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泥鳅的池塘无公害高产养殖技术 总被引：1，自引：0，他引：1
泥鳅又名鳅鱼,鳗鱼鳅,鳛鱼等,在鱼类分类学上属鲤形目,鳅科.泥鳅具有较好的食疗作用和较高药用价值,在我国民间有"天上斑鸠,地上泥鳅"之佳誉,也素有"水中人参"之美称,深受广大消费者的青睐.汉沽区水产技术推广站,自从2000年开始进行泥鳅的池塘高产养殖实验,经过几年的摸索,养殖技术日趋成熟,养殖面积已经从最初的20亩发展到500亩,平均亩产可达3 000 kg,亩效益达到2万元,创造了良好的经济和社会效益.当前,满足国内和国际市场的需求,发展无公害泥鳅养殖,提供更多优质的泥鳅水产品,是当今泥鳅人工养殖业的发展方向,现将泥鳅无公害养殖技术介绍如下. 相似文献
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[编辑部按]坚持人与自然和谐发展--人类永恒的话题:建立人与自然的和谐关系,促进人类文明的持续、长久的发展,现已受到世界各国政府和人民的高度重视,突出表现在:发展"有机农业"这种新的农业生产模式,在全球大多数国家取得共识,并得到迅速推广.特别是在我国,大力提倡和推广有机农业,对推动农业结构调整和产业升级,增加从业人员的收入,提高食品质量和安全水平,保护人民身体健康,以及加入WTO后应对国外农产品的冲击,规避其他国家的"绿色壁垒",都将起到积极而深远的影响. 相似文献
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1美蛙养殖现状横峰县位于江西省东北部,是个以低山和丘陵为主的农业县,养殖水面1万余亩,美蛙养殖业发展较早,已经形成了一定的产业化发展基础。横峰县美蛙养殖是1999年开始的,当时苗种都是外地购买,养殖面积6600m2,产量33 t,随着养殖技术的不断成熟和市场的需求量增大,到目前为止全县美蛙养殖面积达2万多m2,产量170 t,实现了养殖面积和产量跳跃式发展。美蛙苗种也做到了自繁自养,年产量达60万只,不仅能供应本县养蛙业的需求,而且可外售部分蛙苗,全县养蛙业实现了“一条龙”式的良性发展模式。此外,随着全县养蛙业的不断发展,在美蛙销售上做… 相似文献
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<正>近年来,由于国内其他产业的不平衡发展,农村劳力外出打工,加之养猪业的投资大,风险大,受市场和疫病的影响,养殖者收入没有保障,引起生猪货源短缺,猪肉紧俏,价格上扬,给国民经济的发展形成严重影响。去年以来,国务院出台了鼓励养猪业发展的优惠政策, 相似文献
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水产品名牌战略的创造与实施 总被引：3，自引：0，他引：3
名牌战略是企业利用知名品牌来推进产品销售的一种促销手段,也是企业追求长期利益,占领目标市场的有效手段.推进水产品名牌战略的实施,发展中国水产名牌,提高我国水产品在国际国内市场的竞争能力,是推动我国水产企业发展的重要措施之一.在新的环境下,企业必须深刻理解水产名牌的意义及其作用,正确制定和实施企业的名牌觇略,争取在激烈的市场竞争中立于不败之地.我国加入WTO后,面对国内外竞争日趋激烈的水产品市场,许多水产企业感到困惑,步履维艰.然而,在同样的环境条件下,一些企业却在竞争中掌握主动,产品市场份额稳中有升.究其原因,大多得益于品牌的经营.水产企业的竞争是质量、服务、科技实力的竞争,也是品牌的竞争. 相似文献
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"聚众人之力,解一人之难"-- 互保的由来与历史沿革 改革开放以来,我省海洋渔业生产有了长足的发展,在大农业中占有相当大的比重.然而,渔业属于高投入、高风险的产业,自然灾害、船舶意外发生碰撞,触礁、搁浅等事故是所有渔船船东共同面临的危险,这种危险所造成的人员伤亡和经济损失往往是个别船东无法承受的.因此,渔船船东对安全保障的需求越来越大,越来越迫切,政府也急需建立起符合渔业行业特点的社会保障体制.普通商业保险因为投资与利润的考量,很少涉足风险性高的渔业.这样,渔船船东互助保险应运而生.它由政府部门牵头,将渔船船东组织起来,把个别船东无法承受的经济损失,转化为许许多多能承受的小额支出(互保费),由大家共同承受,做到聚众人之力,解一人之难;一人为大家,大家保一人. 相似文献
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鲟鱼加工产品及其开发前景 总被引：1，自引：0，他引：1
鲟鱼全身是宝,因此成为药品与营养品的重要原料.但到目前为止,在我国还没有一家集鲟鱼繁殖、养殖、加工一条龙的企业,鲟鱼产品市场潜力很大,销售看好,发展鲟鱼产业化,效益良好,前景十分广阔.基于鲟鱼的产品特点以及我国的消费市场潜力分析,展望了鲟鱼加工产业今后的发展前景. 相似文献
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<正>近些年,随着疫病的不断出现,使养鸡的效益日益下降,成为制约蛋鸡效益的重要因素,尤其是蛋鸡腹泻的大面积发生,对产蛋率以及蛋壳品质都造成重大影响,现将在日常中的蛋鸡腹泻的原因分析如下,提供给养殖户进行参考:1蛋鸡本身的原因1.1初产蛋鸡,由于产蛋鸡群生产性能发生转移,由生长到生产,要求肠道必须通过更密集的消化作用来满足机体对各种营养物质的需求,饲料品质的突然变化尤其是高能高蛋白的饲料的使用,导致肠道环境 相似文献
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氟苯尼考(florfenicol)，又称氟甲砜霉素，是一种新型广谱高效抗菌药物，自20世纪90年代初开始应用于水产养殖。1990年氟苯尼考首次在日本上市用于治疗黄尾蛳(Seriola lalandei)、真鲷(Pagrosomus major)、银大马哈鱼(Oncorhynchus kisutch)、日本竹笑鱼(Trachurus japonicus)、虹鳟(Oncorhynchus mykiss)、香鱼(Plecoglossus altivelis)、罗非鱼和鳗鱼等的假结核性巴氏杆菌病(pasteurellosis)和链球菌病(streptococcosis)，随后，韩国、挪威、智利、加拿大、英国等分别上市用于治疗专门疾病。中国1999年批准氟苯考尼为国家二类新兽药，在水产养殖上可用于治疗鳗鲡爱德华氏病和赤鳍病。本研究从氟苯尼考抗菌活性与药效学、药代动力学、毒理学、以及药物残留、耐药性等方面探讨其用于水产养殖病害防治的安全性，旨为该药在中国水产养殖中的科学合理应用提供理论参考。 相似文献
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lncRNA在水产动物中的研究进展 总被引：2，自引：1，他引：1
长链非编码RNA(long non-coding RNA, lncRNA)是一类全长超过200个核苷酸的RNA,其转录本缺少开放阅读框和保守密码子,无编码能力。lncRNA能够与RNA、DNA或蛋白质相互作用来介导靶基因的调控,可以在转录水平、转录后水平和表观遗传水平发挥作用。大量研究表明,lncRNA在生殖、胚胎发育、性别分化、免疫和代谢等方面起着关键作用。近年来,关于lncRNA在水产动物上的研究已取得一定成果,但是国内外尚缺乏对其进行全面总结的报道。鉴于此,本文主要对lncRNA的定义及分类、生物学特性、作用机制及在水产动物中的研究进展等方面进行综述,并对其在水产动物中的研究前景进行了展望,以期为以后深入开展lncRNA在水产动物上的功能研究提供参考。 相似文献
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The external layer of a teleost fish scale is composed of type I collagen, an amorphous matrix substance and hydroxyapatite
crystals. Calcification of this layer can be inhibited in the scale-regenerating process under calcium- and phosphate-deficient
(CaDPD) conditions, and can be facilitated by incubation in physiological saline. The aim of this study was to evaluate this
model of calcification using histological and quantitative analysis in order to promote further understanding of the mechanism
of calcification in fish scales. We found that the external layer of the scales produced under CaDPD conditions contained
more densely aligned collagen fibrils with a small amount of the amorphous matrix substance. The CaDPD scale contained only
one-third of the amount of calcium and phosphate present in the control fish. After 4 hours of incubation, a two- to threefold
increase in calcium content and a 1.5-fold increase in phosphate content were observed. Calcification proceeded in the external
layer, and mineral deposits grew only in the electron-dense matrix substance. We conclude that this model would be suitable
for studying the early process of fish scale calcification that occurs in the noncollagenous substance. The electron-dense
substance may contain key molecules that promote calcification. 相似文献
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S. J. Cooke P. J. Weatherhead D. H. Wahl D. P. Philipp 《Ecology of Freshwater Fish》2008,17(4):628-638
Abstract – Parental care is an important, energetically costly component of the life history of many fishes. Despite this importance, little is known about how different species of fish vary parental care in response to natural nest predator burdens. In this study, underwater videography was used to quantify parental care activity of six species of syntopic nesting male centrarchid fishes in Lake Opinicon, Ontario, in response to natural predators. This approach was used to test the hypothesis that as offspring develop from eggs to wrigglers, parental care activity should decrease or remain static for fish guarding nests with low predator burden and increase for those with high predator burden, reflecting different external risks. Principal components analysis (PCA) was used to derive common aeration and nest defence variables. Aeration and predator defence activity of the fish varied extensively among species. Parental care behaviours indicative of defence and vigilance (e.g., turning, departures, time away from nest, displays) tended to be highest for species that had the most predation attempts, although this was not entirely consistent. There was also a positive relationship between the defence PCA metric and attempted predation. Defence did not vary with stage of offspring development, although interactions between defence and developmental stage were noted for several species. A trade‐off between aeration and defence was not observed. In fact, species that provide high levels of aeration also simultaneously provide high levels of defence. Stage‐specific patterns of defence in this study were less apparent than those documented by studies using responses to staged predator intrusions making it unclear as to the extent that fish were responding to the level of the risk to offspring than to the value of the brood. Therefore, combined use of observational and experimental assessments of parental care investment may be most appropriate for refining current theoretical paradigms. 相似文献
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Nutrient load estimation in the waste of Nile tilapia Oreochromis niloticus (L.) reared in cages in tropical climate conditions 
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下载免费PDF全文 We sought to estimate the nutrient load in the waste released into aquatic environments based on the feeding of Nile tilapia (Oreochromis niloticus, L.) reared in cages that were installed in artificial reservoirs. For the calculation, an analysis of the chemical composition of commercial feeds intended for this species in their various stages of production was conducted (N = 130). We combined this information with a meta‐analysis of published data from commercial producers in Brazil about expected feed intake, feed conversion and other animal production indices, and body composition. With these data, it was possible to estimate the load. We estimated that 18% of the feed given to the animals is not consumed and is lost in the aquatic environment. The calculated average digestibility was 71.97% for the organic matter in the diet, 84.06% for protein and 54.40% for phosphorus. The estimated nutrient deposition efficiency, with respect to what was actually consumed by the tilapia, was 26.39% for organic matter, 43.25% for protein and 34.07% for phosphorus. The total nutrient load in the waste per tonne of biomass of produced tilapias was estimated to be 1040.63 kg of organic matter, 44.95 kg of nitrogen and 14.26 kg of phosphorus, representing 78%, 65% and 72% of the respective nutrient amounts supplied by the feed. The information obtained in this study serves as a reference for predicting the potential impact of tilapia farming in reservoirs and to establish scientific parameters for the planning of this activity. 相似文献
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Abstract This paper analyses the factors determining economic success in finfish mariculture in Spain. With this objective in mind, it models the critical economic variables of this industry; in particular, those related to sales and the learning curve. The proposed theoretical model is applied empirically to companies located in Spain, in order to quantify the effects and to determine the differences that could explain the keys to a company's success or failure. 相似文献
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Epitheliocystis is a condition affecting the gills and skin of fish, which has been reported from more than 50 freshwater and marine species. It is caused by intracellular Gram-negative bacteria. Mortalities have been associated with epitheliocystis infections in cultured fish. This review provides an update of our current understanding of this condition, including characterization of the pathogen using immunohistochemical and molecular studies. In most fish species the epitheliocystis agent was negative to an antibody specific for chlamydial genus-specific lipopolysaccharide antigen. Recently, four epitheliocystis agents from four different fish species have been characterized using molecular analysis. While they all belong to the order Chlamydiales, in a lineage separate from the Chlamydiaceae, they are distinct organisms and similarity analysis showed that they had highest similarity values with other chlamydia-like bacteria isolated from various sources, including humans or pig. This confirms the high diversity and host specificity of the pathogen. Further molecular analysis should result in an increased understanding of this condition. To date the pathogen has not been cultured, making experimental studies difficult. High stocking densities, presence of nutrients, season, temperature and fish age have been identified as potential risk factors for the manifestation of this condition. 相似文献
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《Journal Of Applied Aquaculture》2013,25(1):105-114
Early development of white sea bream, Diplodus sargus, ♀ X common dentex, Dentex dentex, ♂ hybrids was compared to those of the parental species. Percent fertilization and percent hatching in the hybrid was not significantly different from those of parental species. Mean hatching time of the hybrid was intermediate between those of the parental species and was significantly different from both parental species. Growth of white sea bream and hybrid fry form days 6 to 30 was not significantly different. All common dentex fry died during this period. Results from this study suggest that this hybrid may be a suitable candidate for fish farming. 相似文献