Seasonal variation in community structure and body length of dominant copepods around artificial reefs in Xiaoshi Island, China   总被引：2，自引：0，他引：2  

孙晓红  梁振林  邹吉新  王龙祥 《中国海洋湖沼学报》2013,31(2):282-289

This study aims to investigate the seasonal variations in copepod community structure and prosome length of dominant species from March 2009 to January 2010 around artificial reefs in Xiaoshi Island,Yellow Sea,Weihai,China.Samples were collected using two types of plankton net(Model I and Model II) for different-sized copepods.The number of taxon was calculated from the data of both the net types,while the copepod abundance was done using the samples from Model II only.Sixteen species of planktonic copepods,including 5 dominant species,were recorded.Results reveal that Oithona similis was the first dominant species from March to June,and was replaced by Paracalanus parvus in September;both dominated the copepod community in January.Acartia hongi was the second dominant species from March to September.Centropages abdominalis was the third dominant species from March to June,and was replaced by O.similis in September and Corycaeus affinis in January.C.affinis was the fourth dominant species in September.Population density of the dominant copepods was compared with that of other similar regions.We found that the dominant species were mostly small copepods(<1 mm) except for adult Centrapages abdominalis.Seasonal variation in prosome length of O.similis,C.abdominalis,and C.affinis,and their copepodites were studied for the first time in China.For P.parvus and A.hongi,seasonal trends in prosome length variation were similar with those in Jiaozhou Bay,Yellow Sea,Qingdao,China,in a similar temperate domain.The results are helpful for future calculation of copepod biomass and production,and for investigation of the relationship between copepods and fish resources.  相似文献   

不确定性对北部湾二长棘鲷渔业资源评估影响的模拟研究   总被引：2，自引：0，他引：2  

朱立新  李丽芳  梁振林 《广东海洋大学学报》2009,29(1)

利用蒙特卡罗模拟方法研究了生物学参考点F0.1、Fmax和当前捕捞死亡系数(current fishing mortality rate,Fcur)估计中的不确定性对北部湾二长棘鲷渔业资源评估的影响。结果表明:二长棘鲷渔业资源状态评估受到F0.1、Fmax、Fcur估计中的不确定性和管理者选取的决策置信水平的影响,二长棘鲷渔业被确定为过度捕捞的概率随着F0.1、Fmax、Fcur估计中不确定性和置信水平的增加而下降;F0.1和Fmax估计中的不确定性主要由生长参数的不确定性引起,自然死亡系数的不确定性对F0.1和Fmax估计中的不确定性的影响是有一定限度的。相比Fmax,将F0.1作为二长棘鲷渔业的管理目标更为合适。  相似文献   

裤式拖网法校核试验和网形分析     

唐衍力  梁振林  Arill Engas  Kjell Gamst 《中国海洋大学学报(自然科学版)》2003,33(5):695-700

裤式拖网法是渔具选择性研究方法之一 ,其网形和校核试验于 2 0 0 2年 1月在挪威特鲁姆瑟海湾进行。在 1 1 5～ 2 70 m的水深范围内 ,测量的裤式拖网网口的水平扩张平均为 (2 3.2 7± 0 .2 6) m,网口高度为 (6.53± 0 .1 2 ) m;右网囊对左网囊的虾渔获物重量之比为 1 .0 0± 0 .0 4 ,右网囊对左网囊的渔获物尾数之比为 1 .0 8± 0 .0 9,渔获物种类及体长频率分布相似 ,基本符合用裤式拖网法进行选择性研究的要求  相似文献   

金枪鱼延绳钓不同位置钓钩渔获效率的研究   总被引：1，自引：1，他引：1  

叶振江  梁振林  邢智良  高志军 《中国海洋大学学报(自然科学版)》2001,31(5):707-712

本文从金枪鱼延绳钓渔具的结构及渔获效果入手 ,分析了大眼金枪鱼 (Thunnus obesus)和黄鳍金枪鱼 (Thunnus albacares)的垂直分布及该延绳钓渔具不同位置钓钩的渔获效率 ,据以对钓具的性能做出初步评价 ,并提出了改进的建议  相似文献   

网箱形状在海流中变化特性的模型试验     

黄六一  梁振林  赵芬芳  朱立新  宋伟华 《中国海洋大学学报(自然科学版)》2006,36(2):245-248,244

据田内相似准则设计了一模型网箱，通过试验测量其不同装配、不同流速、不同配重下，网箱表征容积（网箱横截面的投影面积）的变化。结果表明。流速增加使网箱有效容积受到很大损失；增加配重对于改善网箱的变形是有限度的，在网箱底部加装底框可在一定程度上改善网箱的耐流性能，而作者开发的网箱耐流锚泊技术，可以在较大的流速情况下很好地改善网箱的变形，减少网箱的容积损失，提高网箱抗流性能。  相似文献   

产权安排与水产养殖业发展——以墨西哥、智利和美国华盛顿州为例          下载免费PDF全文

于会国  梁振林 《海洋开发与管理》2006,23(6):145-149

产权能否得到明晰界定和有效实施,将直接影响到资源开发的投资风险,并进而对资本成本产生影响。由于其洄游习性,对鱼类资源的产权是一个非常特殊的问题。在其他条件相同的情况下,产权不完整或限制产权转让倾向于抑制水产养殖业的正常发展;对单一所有者的占有权和使用权不设置障碍,则有助于水产养殖业的充分发育。墨西哥、智利和美国华盛顿州的水产养殖实践,为上述论点提供了例证。  相似文献   

副渔获的分离技术及分离机理     

梁振林  沈公铭  葛长字 《中国海洋大学学报(自然科学版)》2003,33(4):519-524

本文综述了副渔获的分离技术及分离机理。指出以网渔具本身或装设的分离装置达到副渔获分离的目的 ,在对生物多样性的保护、渔业资源的可持续利用等方面都具有现实意义与应用价值。  相似文献   

黄海鱼类群落分类学多样性的研究   总被引：11，自引：0，他引：11  

徐宾铎  金显仕  梁振林 《中国海洋大学学报(自然科学版)》2005,35(4):629-634

为开展不同取样区域，不同生境间和历史数据的比较研究，根据1985年和2000年秋季在黄海进行的渔业资源底拖网调查，应用分类学多样性指数从黄海、区域和局域3个空间尺度上分析了黄海鱼类群落分类学多样性的变化。在黄海尺度上，2000年等级多样性指数△^ 和分类差异变异指数∧^ 明显降低，而1985年的分类学多样性指数值则接近于黄海鱼类主名录的理论平均值。在区域尺度上，分类多样性指数△，分类差异指数△^ 在黄海中、北部较高，南黄海较低；等级多样性指数△^ 为南黄海最高，中黄海最低，其区域尺度变化主要是由鲈形目、鲽形目、鲱形目和鲉形目种类，特别是软骨鱼类的种类数的分布变化造成的。2000年3个区域的分类学多样性指数值分别低于1985年对应值。在局域尺度上，南黄海的南部、西部和中黄海的西部以及北黄海的鱼类群落等级多样性指数△^ 远小于黄海鱼类主名录的理论平均值，仅中昔海的东部和黄海的东部的等级多样性指数值接近理论平均值。  相似文献   

Numerical simulation and experimental study of the hydrodynamics of a modeled reef located within a current   总被引：2，自引：0，他引：2  

姜昭阳  梁振林  唐衍力  黄六一  于定勇  姜曼松 《中国海洋湖沼学报》2010,28(2):267-273

The hydrodynamic forces and flow field of artificial reef models in steady flow were numerically investigated using the RNG k-ɛ turbulent model. The numerical simulation results are consistent with results observed by experimental means. A comparative study indicates that the corresponding errors of forces between calculated values and values observed in the experiment vary in the range of 2.3%–11.2% and that the corresponding errors of velocities vary in the range of 1.3%–15.8%. The flow field numerical results show that upstream and vortices exist when the current passes over and through the surface of the reef model. This study suggests that the numerical simulation method can be applied to predict the forces and flow field associated with artificial reefs.  相似文献   

Numerical simulation and experimental study of the hydrodynamics of a modeled reef located within a current     

姜昭阳  梁振林  唐衍力  黄六一  于定勇  姜曼松 《中国海洋湖沼学报》2010,(2)

The hydrodynamic forces and flow field of artificial reef models in steady flow were numerically investigated using the RNG k–εturbulent model.The numerical simulation results are consistent with results observed by experimental means.A comparative study indicates that the corresponding errors of forces between calculated values and values observed in the experiment vary in the range of 2.3%–11.2%and that the corresponding errors of velocities vary in the range of 1.3%–15.8%. The flow field numerical result...  相似文献