共查询到20条相似文献,搜索用时 125 毫秒
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正大菱鲆在中国称"多宝鱼"。目前是我市海水工厂化设施养殖的主导品种,近年来,随着养殖规模的增加,大菱鲆苗种品种更新改良较慢等原因,我地区大菱鲆养殖相继出现种质退化、病害频发、品质下降等现象。引进养殖效益高、抗病力强的新的适养品种,是我市海水工厂化大菱鲆养殖健康、持续、科学发展的有效措施。2016年,我站利用中央财政补助资金进行了"杂交大菱鲆与普通大菱鲆养殖效果对比试验"。项目取得了成 相似文献
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近年来伴随着大菱鲆养殖规模的扩大、养殖密度的增加以及品种种质的退化,病害问题日趋严重,已成为制约大菱鲆养殖业发展的重大障碍。由于纤毛虫病死亡率高,流行范围广,因而纤毛虫被认为是对海水养殖业危害较大的一类病原体。为了进一步了解该病在养殖中的危害,2008年3—7月对山东莱州地区养殖大菱鲆的纤毛虫病进行了流行病学调查研究,针对纤毛虫病新出现的一些流行病学特点进行了分析、总结,以期为大菱鲆纤毛虫病的预防及治疗提供参考。 相似文献
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三、对《水产苗种管理办法》当前贯彻重点的建议1、切实保护种质资源种质资源是我国水产养殖发展的战略资源,是苗种科技创新的基础,谁掌握了品种资源,谁就掌握了水产养殖业创新的主动权。我国有着丰富的水生动植物种质资源,有海水鱼类1600余种,淡水鱼类800余种,是打造世界水产养殖大国的物质基础。要实现水产良种工程,必须从源头上做起,即加强对种质资源的保护、开发和合理利用,切实保护好天然种质资源。由于工业污染、水利建设及过度捕捞,水产生物资源不仅在量的方面遭到了前所未有的破坏,而盲目引种、移种,盲目的人工放流放养以及天灾人祸… 相似文献
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不同水循环率对大菱鲆生长和水质的影响研究 总被引:2,自引:1,他引:1
研究了封闭循环水养殖系统中不同水循环率对大菱鲆(Scophthalmus maximus)生长和水质变化的影响。试验设置4个水循环率梯度12,24,36,48次/d,大菱鲆初始平均体重为200.36 g。经43 d养殖,12次/d组大菱鲆最终平均体重为277.98 g/尾,而48次/d组达到了296.24 g/尾;12次/d组水体氨氮(TAN)和亚硝酸盐氮(NO2--N)浓度分别为0.41~1.50 mg/L和0.12~0.38 mg/L,而48次/d组分别为0.33~0.56 mg/L和0.05~0.09 mg/L。试验结果显示,提高水循环率可降低系统中氨氮和亚硝酸盐氮的积累速度,优化养殖水质,减小水中有害物质对大菱鲆的胁迫作用,从而加快大菱鲆的生长速度,但对化学需氧量(COD)的去除没有显著影响。 相似文献
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Bowden TJ 《Journal of fish diseases》2003,26(4):207-212
The susceptibility of Atlantic halibut, Hippoglossus hippoglossus (L.), to viral haemorrhagic septicaemia virus (VHSV) was tested. Juvenile halibut of approximately 5 g weight were subjected to challenge by intraperitoneal injection, cohabitation and immersion to a VHSV isolate from an outbreak of the disease in turbot, Scophthalmus maximus (L.). The intraperitoneal injection gave the highest mortality rate of 28% after 50 days. The cohabitee group suffered 19% mortality rate and the immersion group only 2%. Control groups included turbot exposed either by intraperitoneal injection or immersion which suffered mortality rates of 93 and 50%, respectively. The results suggest that halibut are markedly less susceptible to VHSV than turbot. 相似文献
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A Domeénech J F Derenaáandez-Garayzábal C Pascual J A Garcia M T Cutuli M A Moreno M D Collins L Dominguez 《Journal of fish diseases》1996,19(1):33-38
Several strains of Garm-positive short rod (coccibacilli)-shaped bacteria were isolated from diseased cultured turbot, Scophthalmus maximus (L.), in the North of Spain with lesions and signs of Spain with lesions and signs of streptocecosis. The α-haemolytic streptoceoccus-like organisms from diseased turbot were identified by physiological, biochemical and 16S rRNA gene sequence analysis as Streptococcus parauberis. This is the first report of S. parauberis associated with fish disease. 相似文献
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O-group wild turbot (Scophthalmus maximus (L.)) were used in a number of feeding experiments designed to assess the usefulness of readily available species of industrial fish as feed for the ongrowing stage of cultivation (10–500 g). Sprats (Sprattus sprattus (L.)) and sandeels (Ammodytes marinus Raitt) were the most successful in that feeding rates of 2% live weight per feed gave conversion efficiencies which were generally better than 3:1. A regular regime of two feeds a day should give growth rates approaching 2% per day resulting in an ongrowing period of about 200 days at 16°C. The turbot were maintained in closed recirculating systems using a simple design for the treatment units. These provided a stable environment in which to conduct the experiments the average water quality conditions being given. There were few health problems and the taste and texture of the fish produced appeared to be good. 相似文献
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使用扫描电镜对牙鲆、大菱鲆和条斑星鲽的精子和卵子表面形态结构进行比较研究。观察结果表明,3种精子形态结构在核前凹陷位置、精子头部形状、中段线粒体数及鞭毛长度4个方面存在明显差异;3种卵子表面形态结构中,牙鲆和大菱鲆比较相似,而条斑星鲽成熟卵子壳膜具有4点特异性:外表面粗糙、有点状和斑块状突起、网纹较深;壳膜上微小孔孔径差距大;卵膜厚度最厚为(3.87±0.24)μm,约为牙鲆和大菱鲆卵膜厚度的2倍;受精孔的管道螺旋层为4~6层,约为前两者的1/2。条斑星鲽与牙鲆和大菱鲆的精卵表面形态结构差异明显。 相似文献
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P. D. KIRMSE 《Journal of fish diseases》1978,1(4):337-342
Abstract. A new species of pathogenic haemogregarine is described from farmed turbot ( Scophthalmus maximus L.) as Hamogregarina sachai and its life cycle is demonstrated in its final host. An intralexicocytic schizogony followed by an intraerythrocytic schizogony was observed. This appears to be only the second time that a complete life cycle in the vertebrate host has been described for a marine fish haemogregarine. 相似文献
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大菱鲆25日龄3个经济性状的遗传参数评估 总被引:7,自引:1,他引:6
为估计我国引进大菱鲆群体的遗传学参数,2006年从多个大菱鲆养殖场采集源于不同国家和地区、不同进口批次的大菱鲆亲鱼,利用人工授精技术构建了66个全同胞家系,包括26个父系半同胞家系组。选用混合模型方程,通过约束最大似然法进行了方差、协方差、遗传力和遗传相关等估计。结果表明,大菱鲆25d仔鱼体长、存活率和白化率的遗传力分别为0.20、0.07和0.22;3个性状间呈负遗传相关关系,检验不显著。研究结果表明,大菱鲆体长和白化率是中度遗传力,选择育种潜力较大;3个性状任何性状的选择对其他两个性状的影响很小,利用一个性状对另一个性状的间接选择是不可行的。 相似文献