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无棣县拥有浅海滩涂面积10万hm^2(150万亩1,发展渔业养殖具有得天独厚的自然优势。今年以来,无棣县海洋与渔业局通过大力实施省渔业科技人户示范工程,利用“一水多用”现代循环渔业养殖技术,主推对虾与缢蛏、对虾与杂色蛤、对虾与梭子蟹等生态立体混养模式,进行了对虾规模化养殖开发,对虾养殖发展到2.3万hm^2(34.9万亩),实现产量12450t、产值3.11亿元,产量和产值均创历史新高。 相似文献
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无棣县位于山东省滨州市北部,地处黄河三角洲腹地,县境海岸线长102km,潮间带滩涂面积6.5万hm^2(98万亩),浅海面积10万hm^2(150万亩),坡比小,淡水径流多,饵料资源丰富,是泥鳅、对虾、梭子蟹等50多种水生动物的栖息生长地。近几年来,随着渔业资源的衰减,无棣县借黄河三角洲大开发和开展淋水大会战之机,积极启动渔业资源修复行动计划, 相似文献
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乐亭县是河北省沿海大县,海岸线长98.2km,滩涂、浅海面积4.3万hm2(65万亩).对虾养殖起步早、起点高,自80年代以来一直走在全国的前列,成为全国对虾养殖示范县和国内重要的对虾出口创汇基地.作为我县海水养殖的优势品种,对虾一直居县域海洋经济中主导地位. 相似文献
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日照市岚山办事处拥有滩涂面积2.2万亩,适宜养殖的浅海水域50万亩,现有滩涂养殖池 2 700亩,浅海养殖16 000亩。现将我处开展对虾、扇贝“二次创业”的主要经验介绍如下:1 扇贝养殖“二次创业” 我处浅海扇贝养殖开始于1987年,起步于1993年,到 1997年迅速发展到 3万多亩。利益的驱动使养殖单位一哄而上,扇贝养殖区过于集中,密度过大,品种单一,在盛夏高温季节影响下连续2年造成栉孔扇贝大批死亡。我处以科技为手段,改变过去传统养殖方式,积极探索新的养殖思路,发展多品种多模式养殖。1.1 大力椎… 相似文献
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A report is presented of esophagoscopy and gastroscopy in cats and dogs using flexible endoscopes. Following consideration of the basic equipment, an account is given of patient preparation and anesthesia, topography, investigation technique and normal findings. Diagnostic potential, indications and risks involved are discussed. 相似文献
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中国鲟鱼的保护、管理与产业化 总被引:9,自引:1,他引:9
1 世界现存鲟鱼的种类和资源鲟鱼是一类起源早、具有重要科学研究价值和极高经济价值的稀有物种 ,多数种类个体大 ,半数种为溯河洄游产卵鱼类。按目前较为公认的分类系统 ,现存鲟鱼类有 2科 6属 2 7个种 ,隶属于硬骨鱼纲、软骨硬鳞总目、鲟形目 (Acipenseriformes) ,其中鲟属有 17个种 ,主要经济种类在其中。它们全部分布于北半球 ,现存 9个自然分布区为 :太平洋东岸、北美大湖地区、大西洋西北部、北美密西西比河流域和墨西哥湾、大西洋东北部、里海地区、西伯利亚及北冰洋流域、黑龙江和日本海、长江和珠江。鲟鱼自然种群资源稀少 ,在过… 相似文献
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J A Beardmore 《Aquaculture Research》2005,36(10):1035-1036
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D. C. Dauwalter 《Fisheries Management and Ecology》2013,20(4):289-301
Energy development threatens fish and wildlife resources worldwide. This study used constrained ordinations to show fish assemblage structure associated with oil and gas well densities in the Colorado River Basin, Wyoming, but well densities explained only 6.4% of assemblage structure when compared to other factors. Threshold Indicator Taxonomic ANalysis showed significant negative threshold responses by some species to small levels of development (<0.15 wells km?2), whereas positive thresholds were less distinct. Some native and imperilled species could be disproportionately affected if future oil and gas development proceeds in a manner that will impact aquatic resources. Although existing development has not substantially influenced regional fish assemblage structure, it appears to affect a subset of species. Understanding assemblage‐level responses to development can help land managers determine appropriate development levels, prioritise areas for monitoring associated with future development and identify where land protection measures may be needed to offset potential risks. 相似文献
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20 0 1年 ,江苏省高邮市农林局与中国水产科学研究院淡水渔业研究中心及扬州市春申生物化工有限公司共同承担了江苏省水产更新工程项目———“虾、蟹专用肥料的开发研究与推广”。经项目组人员的共同努力 ,现已顺利完成项目任务 ,研究开发的虾、蟹专用肥在试用和大面积推广应用中取得了显著效果。虾、蟹专用肥已被列为江苏省第一批无公害水产品基地拟用鱼药、饲料推荐产品 ;也是江苏省水产技术推广站、安徽省水产技术推广站、江苏省高邮市农林局、江苏省兴化市水产局、江苏省宝应县水产局、安徽寿县水产局等十多个水产行政主管和技术推广部… 相似文献
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Claude E. Boyd Louis R. D'Abramo Brent D. Glencross David C. Huyben Lorenzo M. Juarez George S. Lockwood Aaron A. McNevin Albert G. J. Tacon Fabrice Teletchea Joseph R. Tomasso Jr Craig S. Tucker Wagner C. Valenti 《Journal of the World Aquaculture Society》2020,51(3):578-633
Important operational changes that have gradually been assimilated and new approaches that are developing as part of the movement toward sustainable intensive aquaculture production systems are presented via historical, current, and future perspectives. Improved environmental and economic sustainability based on increased efficiency of production continues to be realized. As a result, aquaculture continues to reduce its carbon footprint through reduced greenhouse gas emissions. Reduced use of freshwater and land resources per unit of production, improved feed management practices as well as increased knowledge of nutrient requirements, effective feed ingredients and additives, domestication of species, and new farming practices are now being applied or evaluated. Successful expansion into culture of marine species, both off and on shore, offers the potential of substantial increases in sustainable intensive aquaculture production combined with integrative efforts to increase efficiency will principally contribute to satisfying the increasing global demand for protein and food security needs. 相似文献
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Analysis of intestinal contents of silver carp (Hypophthalmichthys molitrix) and bighead carp (Aristichthys nobilis) showed that silver carp consumed primarily phytoplankton while bighead carp consumed large quantities of zooplankton and detritus in addition to phytoplankton. The size of particles filtered by the bighead carp was larger (17–3,000 μm) than that filtered by silver carp (8–100 μm). Artificial feed was readily consumed by bighead carp but not by silver carp. No growth difference was indicated for silver carp in fertilized ponds and ponds receiving artificial feed. Growth of bighead carp increased substantially with the addition of artificial feed. Silver carp grew more rapidly in cages than bighead carp. 相似文献
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本试验利用饲养试验方法,研究玉米-豆粕型日粮中添加植酸酶时不同磷水平和钙磷比对生长肥育猪血清指标和骨骼性能的影响。试验选用162头20kg左右的杜长大三元杂交猪进行2×3(磷水平×钙磷比)因子饲养试验,试验分2个阶段进行,前期为生长期体重在20-60kg,后期为肥育期体重为为60-100kg。结果表明:添加植酸酶日粮磷水平对血清磷含量和碱性磷酸酶的活性影响显著(P<0.05);钙磷比对血清钙和血清磷含量的影响显著(P<0.05);添加植酸酶日粮磷水平和钙磷比对生长肥育猪骨骼性能的影响不显著(P>0.05)。在添加植酸酶条件下,降低日粮磷水平不影响猪的正常生长发育。 相似文献
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奶牛酮病发病机理研究进展 总被引:2,自引:0,他引:2
结合国内外目前研究状况较为详细的综述了奶牛酮病的病因与发病机理,并分析了奶牛酮病发生的生化机制。旨在对临床实践中很好的认识诊断和群体监控奶牛酮病提供较为系统的理论依据,保证奶牛群的高产和稳产,从而创造良好的经济效益。 相似文献