拉格朗日插值法在渔业资源评估上的应用

应用拉格朗日插值法拟合鱼类体长与体重之间的函数关系，使用计算机VB语言进行编写程序，与常用的线性回归法、Ricker法进行比较，得出体长与体重的关系式为Pn(x)=∑k=0 ^n yklk(x)=∑k=0 ^n(Пj=0 j≠k ^n x-xj/xk-xj)yk。     

养殖条件下倒刺鲃的年龄与生长

研究了倒刺的年龄与生长规律 ,结果表明 :倒刺鳞片年轮特征主要为疏密切割型。体长与鳞长之间的直线相关L =2 .0 85 4+2 .36 2 0R和幂函数相关L =2 .85 12R0 .952 9中 ,以幂函数相关性密切 ;体重与体长呈指数函数相关W =2 .4 984× 10 - 2 L2 .9936 。 4龄以前生长较快 ,生长指标高 ,体长指标高 ,体长和体重的相对增长率大 ,其生长规律可用VonBertalanffy方程表达 :Lt=[1-e- 0 .132 5(t+ 0 .2 0 95) ],Wt=132 76 .4 0 [1-e- 0 .132 4 (t+ 0 .2 0 95) ]3。体重生长曲线的拐点位于t =8.0 9龄、W8.0 9=3933.6 1g ,即Wt=0 .2 96W∞ 处。倒刺雌性一般在 5龄性成熟 ,雄鱼 3～ 4龄时性成熟。建议江河捕捞对象应为 5 + 龄以上的个体。     

硇洲大黄鱼资源生物学资料分析

1、硇洲——徐闻近海用刺网捕获的大黄鱼主要体长组和主要体重组春汛为351～460毫米和801～1350克,秋汛为381～470毫米和701～1250克。最小体长、体重春汛为275毫米、301克,秋汛为241毫米、251克。最大体长、体重春汛为510毫米、2300克,秋汛为503毫米、2150克。 2、体重与体长的关系式: 春汛 Wt=1.6345×10~(-4)lt~(2.6008) 秋汛 Wt=5.5012×10~(-4)lt~(2.4065) 计算结果表明,同一体长,秋汛的个体比春汛的个体稍重。 3.大黄鱼的生长型适合于Von Bertalanffy生长方程,所求得的各参数值为: 春汛 1~∞=510.67 K=0.3605,t_0=-0.5071。W~∞=2388.41,K=0.2375,t_0=-1.8234。秋汛 1~∞=563.81,K=0.3186,t_0=-0.0623。W~∞=2300.46,K=0.3540,t_0=-0.2642。 4.大黄鱼的生长速度、体长的增长速度以0龄为最大,随着年龄的增大,增长速度逐年减少;体重的增长速度,开始缓慢,随后逐年增大,至增大到最大增长速度之后则逐年减少,拐点年龄春汛为2.80龄、秋汛为2.84龄。 5.年龄组成,春汛为2～5龄,以3、4龄为主,占75％;秋汛为2—6龄,以3、4、5龄居多,占76％。 6.摄食强度,春、秋两汛均以O.I级居多。这可能与产卵期间不食或少食的习性有关。 7.从采样的性腺观察,大部分均为正在产卵的个体,产过卵的也占一定比例。雌雄比,春汛为1:1.52,秋汛为1:0.78。     

高位池养殖凡纳滨对虾生长的研究

用高位池养殖凡纳滨对虾(Litopenaeus vannamei)进行生长研究。凡纳滨对虾养殖密度为135~165万尾/hm2,养殖海水盐度10.0~16.0,温度28.1~34.2℃,pH值7.6~8.8,DO5.0~6.0 mg/L。结果表明:凡纳滨对虾体长(L)与体重(W)的对应关系为:W=0.01 955L2.784;体长生长方程:Lt=13.82(1-е-0.012 01(t-0.699 4));体重生长方程:Wt=29.250 7×(1-е-0.012 01×(t-0.699 4))3;体长生长速率方程:dl/dt=13.823 1×0.012 01×е-0.01 20 1×(t-0.699 4);体重生长速率方程:dw/dt=3×29.250 7×0.012 01×е-0.012 01×(t-0.699 4)×(1-е-0.01201(t-0.699 4)2);高位池养殖凡纳滨对虾拐点年龄为91.36 d,拐点年龄前体长增长较快,拐点年龄后体长增长相对较慢,而拐点年龄前体重增长较慢,拐点年龄后体重增长较快。     

南海北部大陆架短尾大眼鲷生长和死亡参数估计

根据20世纪90年代及60年代的生物学资料，运用体长频率分析法估算短尾大眼鲷的生长和死亡参数。von Bertalanffy生长方程的主要参数L∞=31．5cm，K=0．60，t0=0．44；体重的生长拐点为1．39龄；瞬时总死亡率(Z)、瞬时自然死亡率(M)和瞬时捕捞死亡率(F)分别为2.94，1．07和1．87。当前开发率为0．64，处于资源过度利用状态。     

菊黄东方鲀1龄幼鱼生长特性

对600尾菊黄东方鲀(Takifugu flavidus)1龄幼鱼在池塘养殖条件下的生长特性进行研究。结果表明:菊黄东方鲀67日龄幼鱼经过127 d的培育后,体长从(3.53±0.73)cm增至(10.33±0.98)cm,日均增长0.054 cm,体长增长率193.14%;体质量从(2.41±1.60)g增至(54.39±13.62)g,日均增重0.413 g,体质量增长率2 135.8%,体质量与体长呈幂函数关系,关系式为:W=0.044 8 L3.057 0(R2=0.9922),b值接近于3,属等速生长型。体长(l)与日龄(t)表现为线性相关:l=0.058 5 t+3.781 1(R2=0.9621),体质量(w)与日龄(t)表现为指数相关:w=3.3211 e0.028 6t(R2=0.9363)。     

南海北部大陆架短尾大眼鲷生长和死亡参数估计

根据20世纪90年代及60年代的生物学资料,运用体长频率分析法估算短尾大眼鲷的生长和死亡参数.von Bertalanffy生长方程的主要参数L∞=31.5 cm,K=0.60,t0= -0.44 ;体重的生长拐点为1.39龄;瞬时总死亡率(Z)、瞬时自然死亡率(M)和瞬时捕捞死亡率(F)分别为2.94,1.07和1.87.当前开发率为0.64,处于资源过度利用状态.     

粤西福建纹胸鮡的食性及繁殖力

对2007年取自粤西水域的福建纹胸鮡进行生物学研究。结果显示:粤西福建纹胸鮡食性是以动物性食物为主;雌雄性比为1.16∶1;性腺成熟系数雌性为0.263%～19.048%,雄性为0.101%～3.226%;福建纹胸鮡个体绝对怀卵量在45～420粒之间,平均140.9±74.7粒;相对怀卵量在31.7～130.4粒/g之间,平均64.3±21.1粒/g;绝对怀卵量与体长呈幂相关:y=0.0008 x7.7308,R2=0.855 2;绝对怀卵量与体重呈指数相关:y=14.439 e0.838 2 x,R2=0.878 3。     

南海北部竹筴鱼的生长、死亡及合理利用

根据1997年12月至1999年6月在南海北部进行的大规模底拖网渔业资源调查中8个航次4个季节的竹筴鱼(Trachurus japonicus)生物学测定资料,运用FAO开发的最新体长频率数据分析软件FiSATⅡ对竹筴鱼的生长、死亡参数进行估算,并进一步应用Beverton-Holt模式对南海北部竹筴鱼的最新资源状况进行研究.结果表明:(1) 竹筴鱼的叉长和体重的关系式为:W=2.282 8×10-5L2.915 4.(2) 其von Bertalanffy生长方程的各参数为:渐近叉长L∞=31.2 (cm),渐近体重W∞=426.5 (g),生长系数K=0.42,t0=-0.376.(3) 总死亡系数Z=2.15,自然死亡系数M=0.91,捕捞死亡系数F=1.24,开发率E=0.58.在估算结果的基础上,进一步提出南海北部竹筴鱼的最佳可捕规格为叉长14.8 cm.     

西施舌生长的研究

于 1998年 11月至 2 0 0 2年 12月 ,在福建长乐对西施舌 (Coelemactraantiguata)的生物学特征进行测定 ,以人工养殖方法观察其周年生长情况。观测结果表明 ,长乐沿海西施舌的群体组成以体长 6 1～ 110mm占优势 ,其频率 ( fn)为 0 .14 0～ 0 .2 2 2～ 0 .12 5。不同大小的西施舌 ,软体部肥满度指数 (CI)具有明显的季节差异。 1龄西施舌月平均体长增长 4 .0 5mm ;2龄的为 2 .31mm ;3龄的为 1.83mm ;1～ 3龄为成体生长发育阶段 ,3龄之后趋向衰老。不同发育生长阶段的壳高与壳长直线回归关系 :幼虫期H =0 .994L - 13.0 7;稚贝期H =0 .90 5L - 4.76 ;幼贝期H =0 .0 14 +0 .82 4L ;成贝期H =0 .36 7+0 .72 4L。     

Preliminary study on plasma membrane fluidity of Psychrophilic Yeast Rhodotorula sp.NJ298 in low temperature

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.     

Information for authors

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     

JOURNAL OF OCEAN UNIVERSITY OF CHINA

<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     

Information for Authors

<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-     

Hydraulics and Hydrology in Mountain Areas

<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     

Sea ice thickness measurement in spring season in Bothnian Bay using an electromagnetic induction instrument

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.     

Thermohaline structure inhomogeneity associated with polynia at the northern margin of Emery Ice-shelf

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.     

Phylogenetic analysis of cultivable bacteria isolated from Arctic sea-ice

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.     

Information for authors

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 comprchensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose is to publish achievements in fundamental research,applied