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在室外土池缢蛏人工育苗过程中，进行了不同催产方法的效果对比试验，结果表明；低盐度海区亲蛏催产效果高于高盐度海区，采用淡化水刺激，进行8小时阴干刺激，经过暂养的亲蛏催产效果较好。 相似文献
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利用现有的对虾育苗设施,进行缢蛏人工催产,浮游幼虫培育和稚贝培养,提供缢蛏养殖户所需苗种,获得成功,１９９７年出池稚贝平均密度７６．２６×１０＾４颗／ｍ＾２（壳长５０１～９２０ｕｍ）最高密度１１１．１５×１０＾４颗／ｍ＾２（壳长５０１～８１１ｕｍ）。 相似文献
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关于缢蛏的养殖技术之二缢蛏生产性人工育苗技术总结 总被引：1，自引：0，他引：1
缢蛏（Ｓｉｎｏｎｏｖａｃｕｌａ ｃｌａｒｎａｒｃｋ）属于瓣鳃纲,异齿业纲,帘蛤目,竹蛏科贝类,它是我国开展贝类养殖较早的种类,是我国虾塘和滩涂贝类主要养殖品种。 缢蛏殖苗种来源一直依赖于自然繁殖,受自然苗丰欠制的的程度较高。为了稳定和提高缢蛏苗种生产能力,满足养殖所需．笔者于１９９６年利用育苗厂秋季空闲时间和设备,进行了缢蛏生产性人工育苗预备试验。１９９９年在乐清市翁万利来育苗厂进行了缢蛏生产性人工育苗正式试验,并取得了可喜的成绩：共育出稚贝１４．９亿颗（平均壳长８３４．９ｍ,重５８．６ｋｇ,单位… 相似文献
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缢蛏从南方逐渐进入了北方,并成为北方滩涂养殖的一个新亮点。缢蛏全人工养殖是由室内人工育苗、室外越冬暂养和滩涂围网养成三个环节而构成的,现将每个生产环节的技术要点介绍如下。一、缢蛏室内人工育苗技术1.育苗设施可利用扇贝、泥蚶等贝类育苗设施及供水、供气配套系统进行缢蛏人工育苗生产。2.亲贝选择进入9月份,缢蛏性腺逐渐成熟,此间选择滩质好、无污染、缢蛏肥满度高、性腺发育好的海区,定期定点取样检查其性腺发育情况。当确认性腺成熟时,挖取蛏种,经挑选、洗刷,入池进行催产。实验表明,缢蛏亲贝入池培养难度较大。因此,适时掌握… 相似文献
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据舟山市水产研究所消息，备受国内水产界、科技界关注的舟山岱衢族大黄鱼人工育苗研究，取得突破性进展。在舟山市水产研究所岙山试验基地，２０００年１０月２８日、２９日连续两个晚上，大黄鱼亲鱼经人工促熟催产等技术措施，顺利收获受精卵３０万多粒，并育成两毫米、细如发丝的大黄鱼苗约３０万尾。 据了解，目前全国各地养殖的大黄鱼均为福建鱼种，其性状、品质不如岱衢族大黄鱼。且从８０年代中期至今，福建大黄鱼经１０多代繁殖，性状退化，品质下降。 岱衢族大黄鱼人工育苗，是国家科技部、省科委联合下达的重点攻关课题，由舟山普… 相似文献
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报道了缢蛏北方室内人工育苗试验。采用不同获卵方法,进行产卵孵化和幼虫培育,以优质泥滩作为附着基,加强附着管理,平均出苗密度达18．29万粒／m^2,专家鉴定认为,达国内领先水平。 相似文献
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缢蛏[sinonovaculaconstricta（Lamarck）]，俗称蛏子、泥蛏、蜻，属双壳类海产软体动物。浙江温岭是有名的产蛏（蛏苗与商品蛏）区，２００１年该市养蛏面积已达６．２万亩，总产量达４０６００吨，预计“十五”期间可增至１０万亩以上。由于海洋环境状况变化较大，受不稳定自然条件的制约，蛏苗紧缺已成问题，几年来，尽管科技人员采取多方增殖，但仍无法满足广大养殖户需求，不同程度地制约着养蛏业的稳步发展。为解决这一现实问题，我们进行了缢蛏工厂化育苗研究，经过两年多的努力，获得成功。现将缢蛏工厂化全人工育苗技术报告如下：… 相似文献
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缢蛏人工育苗及中间暂养技术 总被引：5，自引：0，他引：5
利用对虾育苗设施进行缢蛏人工催产、浮游幼虫培育、稚贝培育和室外中间暂养。1997年出池稚贝平均密度76.26×104颗／m2（壳长501~920μm）,最高密度111．15×104颗／m2（壳长501－811μm）。土塘中间暂养成活率91．25％（至亮长0．25cm左右）,滩涂中间暂养成活率85．62％（至壳长0．2cm左右）。 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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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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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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该研究选取具有多态性的6对微卫星引物对构建的2批合浦珠母贝(Pinctada fucata)完全双列杂交家系的遗传多样性进行了分析。6个微卫星标记在9个家系360个个体中共检测到32个等位基因,有效等位基因(Ne)为1.758 7~3.586 5,观测杂合度(Ho)为0.144 4~0.488 9,期望杂合度(He)为0.432 0~0.722 2,Shannon指数(I)为0.691 9~1.507 4。9个家系都有单态位点,平均Ho为0.129 2~0.466 7,平均He为0.155 0~0.439 6,平均I为0.248 5~0.712 2。有19个位点(占35.19%)极显著地偏离Hardy-Weinberg平衡。各家系之间的遗传距离为0.109 0~1.137 2,遗传相似性系数为0.320 7~0.896 8。家系L4B46与L4B48的遗传距离最大,与D3D313的遗传距离最小。UPGMA法聚类分析显示,9个家系分为3支,L4B48单独成一支,B4D426、B4D427与D4B445聚成一支,其余家系聚成一支。该研究结果为合浦珠母贝家系选择育种的亲本选择与交配设计提供了科学依据。 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
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Peter Howgate 《Journal Of Aquatic Food Product Technology》2013,22(5):516-532
It is well-established in fish technology that freshness should be measured primarily by sensory procedures, though considerable effort has been expended in looking for nonsensory alternatives. A variety of methods for sensory evaluation of freshness has been described and this historical review traces developments of these methods. Much of the source material derives from the research literature such as research journals and reports of research, and the use of sensory methods in commercial quality control has scarcely been documented. There is a brief discussion of possible future developments in sensory evaluation of freshness. 相似文献