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1.
杨吝 《广东海洋大学学报》1991,(1)
根据农牧渔业部水产局下达的“294.2千瓦综合节能渔船”项目网具节能课题的要求,新设计了一项低阻底拖网,并进行了网模水池试验和海上实测及一周年商业性捕鱼生产,获得了很好的效果。试验和捕鱼生产结果充分证明:新设计的拖网网口高、阻力小、渔获量高,是一种较为理想的节能型双船底拖网网型,具有增产节能兼优的经济效益和社会效益。 相似文献
2.
不同结构网囊特性的初步研究 总被引：4，自引：0，他引：4
杨吝 《广东海洋大学学报》1998,18(2):25-29
为了测定不同施网网囊结构对网囊的几何形状、网目张开、网目形状和拖网阻力的影响,设计和制作了４种网囊,一种是传统的菱形网目（ＤＭ）网囊,另三种是新型网囊：方形网目（ＳＭ）网囊,菱、方、形网目混合二片式（ＤＳＭ２）网囊和菱方形网混合四惩式（ＤＳＭ４）网囊。于１９９６年９月１１－１２日有中山大学试验水槽进行了网模试验,结果表明,（１）各网囊阻力相差不大,且随拖速和渔获的增加而增大。２）新型网囊的几何形状 相似文献
3.
采用延绳式、浮筏式、立桩式在外海深水区进行马氏珠母贝［Ｐｉｎｃｔａｄａ ｍ ａｒｔｅｎｓｉｉ （Ｄｕｎｋｅｒ）］人工养殖试验，结果表明：经 １１ 个月的养殖，其成活率分别为延绳式 ５６．３％ ，浮筏式 ３２．８％ ，立桩式２０．８％ ，而同期在港湾浅水区养殖时，其成活率分别为浮筏式 ２８．８％ ，立桩式 １８．５％ 。而且外海深水区养殖马氏珠母贝生长快，个体大，体质强，病害少，附着物少。此外，外海深水区延绳式养殖设施抗风浪能力强，是开发利用外海深水区的一种良好方式 相似文献
4.
南海底拖网方、菱目网囊选择性研究 总被引：5，自引：0，他引：5
1997年6月－1998年7月，使用3种网目尺寸的方形网目网囊和一种网目尺寸的菱形网目网囊，在南海北部珠江口以外海域水深35－96m拖网渔场进行了部26个有效网次的捕鱼对比试验，获得了关于蛇鲻，绯鲤，金线鱼3种鱼种的选择性参数。结果表明，方形网目网囊比菱形网目网囊具有更好的选择性能，对于保护南海幼鱼资源是有效的。 相似文献
5.
南海区拖网方目网囊选择性试验 总被引：2，自引：0，他引：2
为了科学地确定南海区拖网网囊的结构和适宜网目尺寸，于2000年11月24日－12月20日在南海北部珠江口以外海域水深36－70m拖网渔场，对4种不同网目尺寸的方目网囊进行了网囊套网式捕鱼选择性试验，获得了蓝圆Cuan（Decapterus maruadsi)，多齿蛇鲻（Saurida tumbil)，条尾绯鲤（Upeneus bensasi)等3种主要鱼种的选择性曲线，试验结果表明，4种方目网囊的数量平均逃逸率均高于重量平均逃逸率，网囊渔获的优势体长总是大于套网渔获的优势体长，蓝Cuan，多齿蛇鲻，条尾绯鲤之类的圆体鱼类比扁体鱼类更易于逃出方目网囊。 相似文献
6.
南海底拖网方、菱目网囊选择性研究 总被引：1，自引：0，他引：1
1997年 6月～ 1 998年 7月 ,使用 3种网目尺寸的方形网目网囊和一种网目尺寸的菱形网目网囊 ,在南海北部珠江口以外海域水深 3 5～ 96m拖网渔场进行了总共 2 6个有效网次的捕鱼对比试验 ,获得了关于蛇鲻、绯鲤、金线鱼 3种鱼种的选择性参数。结果表明 ,方形网目网囊比菱形网目网囊具有更好的选择性能 ,对于保护南海幼鱼资源是有效的 相似文献
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8.
陈福保 《广东海洋大学学报》1980,(2):55-70
随着我国水库渔业的发展，近年来高效率的捕鱼工具“拖网”在东北及中南的一些水库先后投入生产。据了解目前水库的拖网类型计有底拖网、浮拖网和中层拖网等三种。 相似文献
9.
不同结构网囊特性的初步研究 总被引：1，自引：0，他引：1
杨吝 《广东海洋大学学报》1998,(2)
为了测定不同拖网网囊结构对网囊的几何形状、同目张开、网目形状和拖网阻力的影响,设计和制作了4种网囊,一种是传统的菱形同目（DM）网囊,另三种是新型网囊：方形同目（SM）网囊,菱、方形网目混合二片式（DSM2）网囊和菱、方形同目混合四片式（DSM4）网囊。于1996年9月11～12日在中山大学试验水槽进行了同模试验,结果表明：1）各网囊阻力相差不大,且随拖速和渔获的增加而增大。2）新型网囊的几何形状和同目的张开及其形状均优于传统菱形网目网囊。3）空网时,各种网囊均呈圆筒状。当网囊中有了渔获后,传统菱形同目网囊的端部变为球状,除了球状部分的网目有较大张开外,其余同目张开很小,网囊使用直径也小,而新型网囊始终保持筒状,且网目充分张开,网囊使用直径也大。4）新型例翼的几何形状及使用直径和网目的张开及形状几乎不受拖速大小、有无渔获和渔获多少的影响。 相似文献
10.
为了科学地确定南海区拖网网囊的结构和适宜网目尺寸 ,于 2 0 0 0年 1 1月 2 5日～ 1 2月 2 0日在南海北部珠江口以外海域水深 36～ 70m拖网渔场 ,对 4种不同网目尺寸的方目网囊进行了网囊套网式捕鱼选择性试验 ,获得了蓝圆鱼参(Decapterusmaruadsi)、多齿蛇鲻 (Sauridatumbil)、条尾绯鲤 (Upeneusbensa si)等 3种主要鱼种的选择性曲线。试验结果表明 :4种方目网囊的数量平均逃逸率均高于重量平均逃逸率 ;网囊渔获的优势体长总是大于套网渔获的优势体长 ;蓝 鱼参、多齿蛇鲻、条尾绯鲤之类的圆体鱼类比扁体鱼类更易于逃出方目网囊。 相似文献
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The ability of cell to modulate the fluidity of plasma membrane was crucial to the survival of microorganism at low temperature. Plasma membrane proteins, fatty acids and carotenoids profiles of Antarctic psychrophilc yeast Rhodotorula sp. NJ298 were investigated at -3 ℃, 0 ℃ and 8 ℃. The results showed that plasma membrane protein content was greater at -3 ℃ than that at 8 ℃, and a unique membrane polypeptide composition with an apparent molecular mass of 94.7 kDa was newly synthesized with SDS-PAGE analysis; GC analysis showed that the main changes of fatty acids were the percentage of unsaturated fatty acids (C18∶ 1 and C18∶ 2) and shorter chain saturated fatty acid (C10∶ 0) increased along with the decrease of the culture temperature from 8 ℃ to -3 ℃; HPLC analysis indicated that astaxanthin was the major functional carotenoids of the plasma membrane, percentage of which increased from 54.6±1.5% at 8 ℃ to 81.9±2.1% at -3 ℃. However the fluidity of plasma membrane which was determined by measuring fluorescence anisotropy was similar at -3 ℃, 0 ℃ and 8 ℃. Hence these changes in plasma membrane's characteristics were involved in the cellular cold-adaptation by which NJ298 could maintain normal plasma membrane fluidity at near-freezing temperature. 相似文献
13.
《极地研究(英文版)》2014,(4)
正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprehensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose 相似文献
14.
《中国海洋大学学报(英文版)》2014,(4)
<正>Copyright Submfnion of a roanusatpt inks:that the work described has not been published before(exoept In the form of an abstrW or as part of a published lecture,review,or thesis);that it is not under consideration for publication elsewhere that its publication has been approved by ail 相似文献
15.
《中国海洋大学学报(英文版)》2014,(6)
<正>The Journal of Ocean University of China(Oceanic and Coastal Sea Research)is a comprehensive academic quarterly sponsored by the Ocean University of China,published one volume per year.This journal is devoted to the publication of the theoretical and applied research results on oceanography and marine fisheries.The fieldcovered include the physical,chemical,biological,geo- 相似文献
16.
Massimo GRECO 《山地科学学报》2014,(6):1383-1384
<正>The 35th IAHR World Congress was held in Chengdu,China from September 8 to September 132013.The title of the conference was:"The Wise Finds Pleasure in Water:Meandering through Water Science and Engineering".During the congress,1239 papers were presented in 139sessions for oral presentations and 7 sessions for poster presentations.After the Congress,a Committee was appointed to select some of the best papers presented at the Congress for publication,after a 相似文献
17.
As an important component of the cryosphere,sea ice is very sensitive to the climate change.The study of the sea ice physics needs accurate sea ice thickness.This paper presents an electromagnetic-induction(EM) technique which can be used to measure the sea ice thickness distribution efficiently,and the successful application in Bothnian Bay.Based on the electromagnetic field theory and the electrical properties of sea ice and seawater,EM technique can detect the distance between the instrument and the ice/water interface accurately,than the sea ice thickness is obtained.Contrastive analysis of the apparent conductivity data obtained by EM and the value of drill-hole at same positions allows a construction of a transformable formula of the apparent conductivity to sea ice thickness.The verification of the sea ice thickness calculated by this formula indicates that EM technique is able to get reliable sea ice thickness with average relative error of only 12%.The statistic of all ice thickness profiles shows that the level ice distribution in Bothnian Bay was 0.4-0.6 m. 相似文献
18.
Based on the hydrographic data in austral summer during the 22nd Antarctic Expedition of China(2005/2006),some features can be found about the northern margin of Emery ice shelf as follows.The heat content in the surface layer(0-50 m) at the eastern end and the western end of the ice-shelf margin is much higher than that at the middle.The upper mixing-layer depth and the seasonal thermocline depth at the middle of the ice-shelf northern margin are much shallower than those at the both ends.However there is much less difference between the middle and the ends in the bottom layer.The remote sensing photos show that the inhomogeneity in the surface-layer water is closely related to the spatial distribution of the floes and polynia in the area. 相似文献
19.
Phylogenetic analysis based on 16S rDNA of 8 strains of cultivable bacteria isolated from Arctic sea-ice was studied.The results showed that strain BJ1 belonged to genus Planococcus,which was a genus of low mole percent G C gram-positive bacteria;strain BJ6 belonged to genus Burkholderia of β-proteobacteria and the rest 6 strain all belonged to γ-proteobacteria,of which strain BJ8 was a species of Pseudoalteromonas,strain BJ2-BJ5 and BJ7 were members of genus Psychrobacter.Phylogenetic analysis also indicated that bacteria of genus Psychrobacter of the isolates formed a relatively independent phylogenetic cluster in comparison with other bacteria belonged to genus Psychrobacter. 相似文献
20.
正Rapid changes of Arctic sea ice cover have been in the focus of the international climate research community in recent years.Quite a few of nations have completed a large number of related surveys and research projects in the Arctic Ocean.Up to now,China has performed six research cruises to the Arctic Ocean resulting in a significant volume of research output.Improved knowledge on the atmospheree-sea ice-ocean interactions in the Arctic is a 相似文献