共查询到19条相似文献,搜索用时 125 毫秒
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随着大菱鲆养殖产业的兴起与发展。广大养殖户学习大菱鲆养殖技术的要求电越来越强烈,笔者根据近几年的经验,将简易大棚养殖大菱鲆的技术要点简要概括如下,供广大水产科技工作者和养殖业者参考。 相似文献
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目前,大菱鲆养殖发展迅速,仅山东省莱州市就有养殖温室大棚500多个,养殖面积40万m2,养殖大菱鲆约150万尾~200万尾。现在国内大菱鲆专用饲料很少,成鱼养殖一般从国内饲料厂家购置粉末饲料,然后加入添加剂和鲜杂鱼肉搅拌挤压成湿性颗粒料,现做现喂。这种做法优点是原料容易购进、制作工艺简单、价格比较便宜,能够保持生鲜饵料特有的营养成分。但根据我们最近的一次调查显示,由于许多养殖户对大菱鲆营养需求及摄食习性方面的知识了解甚少,在自制饲料过程中出现了一些问题:一为人吃的有营养的东西鱼吃了一定也有好处,… 相似文献
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大菱鲆是欧洲重要的海水养殖鱼类之一,其饵料转换量高,生长迅速,耗氧量低,非常适合高密度养殖和远距离运输。在英国自50年代就开始养殖,目前已经达到企业化生产水平。1992年中国水产科学研究院黄海水产研究所把大菱鲆引进我国,经过8年的艰苦探索,1999年取得了全人工育苗技术的重大突破和大批量生产性育苗的成功,使大菱鲆成为一个新的养殖良种。目前,大菱鲆养殖已成为我国第四次海水养殖浪潮中一个引人注目的亮点。本文简要介绍了大菱鲆的生态习性和利用塑料大棚井水养殖的具体方法,供大家参考。一、大菱鲆的生态习性1、大菱鲆属于… 相似文献
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大菱鲆Scophthalmus maximus具有生长速度快和低温耐受力强等特点,是世界上养成范围最广、产量最大的鲆鲽类养殖良种。自1992年引进至今,大菱鲆养殖已经发展成为年产量超过6万t的海水养殖支柱产业。作者综述过去20年里,我国大菱鲆在产业发展、苗种生产、良种选育、养殖模式、营养与饲料、疾病防控、加工与质量控制、养殖经济以及市场开拓等方面所取得的系列成果,并就发展前景进行了展望,旨在为我国大菱鲆和鲆鲽类养殖的可持续发展提供参考。 相似文献
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病毒防治技术是大菱鲆养殖生产中的一个关键技术。中国水科院黄海水产研究所大菱鲆研究专家认为,大菱鲆的疾病防治是一个复杂的系统工程。单纯依赖药物治疗是解决不了问题的,建议应首先从营养、水质控制和育苗工艺上下功夫;其次是加强鱼类免疫增强剂和育苗的研究、开发和推广应用工作;最后才是开展有针对性的药物研究。 相似文献
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近年我市大菱鲆人工养殖发展很快,但目前国内大菱鲆专用饲料却很少。丹东地区个别养殖户对大菱鲆的营养需求及摄食习性了解甚少,在自制饲料过程中出现了一些误区,导致大菱鲆营养不良,生长缓慢。 相似文献
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The production of juvenile turbot in research and commercial practice still involves the use of live foods for the early larvae. The rotifer Brachionus plicatilis is used for the first few days followed by nauplii of the brine shrimp, Artemia salina. During this live food phase, the addition of live unicellular algae to the rearing tanks improves the growth and survival of the turbot larvae.Within 10 days of the start of feeding, large differences in growth rate become apparent depending on the presence or absence of particular algae. The use of Dunaliella tertiolecta in particular results in stunted growth and high mortalities. Evidence is presented in this paper that Dunaliella tertiolecta is not toxic, and that its failure to support turbot larval growth is probably due to a deficiency of long-chain polyunsaturated fatty acids. These compounds have been shown by other workers to be an essential dietary requirement in O-group turbot. 相似文献
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The growth rates and food conversion efficiencies of juvenile normally pigmented turbot, malpigmented turbot and turbot-brill hybrids were measured at 10°C and 14°C. The survival rate over the 120-day experimental period was 96%. Results showed no evidence of hybrid vigour (heterosis), and in fact significantly higher growth rates were observed in turbot. All three types of fish grew faster at the higher environmental temperature due mainly to a much improved appetite, but also perhaps due to an increase in the food conversion efficiency. Malpigmented turbot appeared particularly well suited to the conditions associated with intensive culture and exhibited the highest growth rates at both 10 and 14°C. For malpigmented turbot at 14°C the mean growth rate was 2.17% per day. 相似文献
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A production season of turbot larvae Scophthalmus maximus (Linnaeus, 1758) reared on copepods in a Danish (56°N) semi‐intensive outdoor system 下载免费PDF全文
Per M Jepsen Hans H Jakobsen Thomas A Rayner Elisa Blanda Aliona Novac Kirsten Engell‐Sørensen Benni W Hansen 《Aquaculture Research》2017,48(9):4958-4974
Turbot were reared from yolk sack larvae to juvenile in an outdoor semi‐intensive system. Three production cycles were monitored from May to September. A pelagic food chain was established with phytoplankton, copepods and turbot larvae. Abiotic and biotic parameters of lower trophic levels together with turbot larval survival, development, prey electivity and growth were monitored. A decreasing larval survival from 18.4% in May to 13.6% in July and just 7.0% in September was observed. The overall phytoplankton and copepod abundance decreased during the productive season. The turbot larval growth showed significant differences between larvae below (isometric) and above (allometric) 7 mm. Larval fish gut content showed no differences with available prey between production cycles. Therefore, it appears that the available prey concentration is governing their growth in this outdoor system. First‐feeding turbot larvae exhibited active selection for nauplii whereas developed larvae switched to copepodites and adult copepods. Although developing turbot larva exhibited active selection towards copepod size classes, there was no evidence of selective feeding on either of the two dominant copepod species. The turbot larvae's prey ingestion was modelled together with the standing stock of copepod biomass. The model results indicated that the estimated need for daily ingestion exceeded the standing stock of copepods. Hence, the initially established food web was unable to sustain the added turbot larvae with starvation as a consequence. We therefore suggest several solutions to circumvent starvation in the semi‐intensive system. 相似文献
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Hongman Hou Jie Ding Gongliang Zhang Li Chen 《Journal Of Aquatic Food Product Technology》2013,22(6):530-541
The microbial flora in turbot (Scophthalmus maximus) cultured in deepwell seawater from Liaodong Peninsula, China was studied for the first time. The total amount of aerobic meso- and psychrophilic microflora from the culturing water, gills, and skin were 3.46–3.82, 3.19–4.28, and 1.70–1.95 log cfu/g, respectively. Out of 204 strains isolated from fresh turbot meat with skin, Gram-positive bacteria accounted for 19.2% of the total aerobic meso- and psychrophilic microflora, and 72.1% were Gram-negative bacteria. Phylogenetic analysis was performed using 16S rDNA sequences of microbial flora isolated from turbot. The predominant bacteria in fresh turbot were Micrococcus, Serratia liquefaciens, and Enterobacteriaceae. Meanwhile, the bacterial flora of refrigerated turbot fish were investigated, and the results indicated that Shewanella putrefaciens was the predominant spoilage bacteria. 相似文献