虾池中增氧机的使用方法及效果

增氧机在国内外淡水渔业中早已得到广泛应用［１，３］，台湾及东南亚一些进行集约化养殖对虾的地区和国家，也在虾池中使用增氧机。目前我国有的地区在养虾中也有所应用。本文就虾池中如何正确使用增氧机及效果进行报道。１使用方法试验所用增氧机为中国水产科学研究院渔业工程研究所研制的１．５ｋｗ螺旋桨水流增氧机［２］。试验地点为牟平县宁海镇养虾场。１９９１年在养虾三区１号池（８亩，长１８０ｍ，宽２９．６ｍ）安装了２台，以相邻的２号池（３５亩）作对照池。１９９２年在养虾一区１０号池（３５亩，长４００ｍ，宽５８．３ｍ…     

海水中痕量苯系物的气相色谱测定的研究

Domestic polymeric microbeads GDX-502 were used to concentrate benzene hydrocarbon from seawater. The absorbed benzene hydrocarbon was removed by thermal desorption and directly injected into gas chromatograph and determined by FID detector. It was optimal for the rapid and precise determination of trace benzene hydrocarbon in seawater. In this Paper the investigation of benzene hydrocarbon in the coastal water of Jiaozhou Bay (Qingdao) is reported as well. The data for benzene hydrocarbon are listed in table 3 for 1984 and the station locations are given in figure 6.     

REPRODUCTIVE BEHAVIOUR AND EARLY EMBRYONIC DEVELOPMENT OF Trachypleus tridentatus

This paper reports the season, environmental conditions and pattern of spawning, fecundity and hatching amount of king crab, Trachypleus tridentatus. The egg-diameter of this animal has seasonal variations, which is different from that reported in foreign countries. The egg cleavage of the animal is in the transitional pattern from holoblastic cleavage to surface division. Egg cleavage occurs firstly on one pole with false cleavage furrows, the number of division nucleus increases continuously which move outward from the yolks to form into a layer of blastomere on the surface of the blast together with some of egg plasma. The blastomere formed into the blastoderm and the polygonal cells encircled in this cell layer is equal to the "yolk cells" of insects during the period of egg cleavage. The formation of the periblas-tula is the result of egg cleavage. This paper makes application of the technique of vital staining in exploring the properties of the stained particles. The death of the blasts after stai     

模拟36.5米氮氧饱和潜水26昼夜人的生理功能变化和安全减压问题

饱和潜水技术可大大延长水下作业时间、提高潜水作业效率,是开发海底资源、水下施工、援潜救生、海洋考察和科学研究不可缺少的一种手段.近20年来,取得了较大的进展,人体氦氧饱和潜水模拟实验的深度已达650米,现场饱和潜水为460米,巡潜已达501米.     

应用微核技术监测海水诱变剂的初步实验

工业化和环境污染总是并行发生的。如何在工业化过程中尽量避免环境污染是大家关心的问题。在研究这个问题中，建立有效的生物测定法，来监测环境污染，防止污染物影响人类健康是很有意义的。     

高科技生产紫菜的生物技术

紫菜营养细胞的悬浮培育和细胞原生质体的分离，培养和筛事所建立的能连续分裂，发育和具有遗传性能的稳定性无性繁殖纯品系以及在此基础上的同种或异种间的细胞融合是高科技发展紫菜生产的生物技术。它与现今的紫菜养殖方式相比是具有多方面的优越性。     

滨,浅海沉积砂砾石资源的利用潜力

作为建筑骨料的砂砾石资源传统上来自陆地山体的开采、风化的碎石、废弃的矿渣、古河道和现代河道底床沉积砂砾以及海岸带的沙体。由于全球人口增长，特别是经济发展引发的高速工业化和城市化进程，极大地刺激了对建筑用料的需求膨胀；另一方面，人均土地资源的锐减引起土地价格上升，陆地建筑用料资源的持续开采和不断减少以及环境保护的压力都导致陆地来源的砂砾石开采成本大幅度提高，８０年代以来，以英国和日本为代表的发达国家各自发展了自己的海上采砂产业和相关技术，近年来，许多发展中国家也开始重视滨、浅海砂砾石资源的开发和利用。     

3种蚶染色体组型的比较研究

用鳃细胞空气干燥法制片,对双壳纲翼形亚纲蚶科泥蚶、毛蚶、魁蚶的染色体组型进行了分析研究。它们的染色体数目(2n)和总臂数(NF)都相同,但是染色体组型不同,泥蚶染色体组型2n=38,28m+10sm;毛蚶2n=38,14m+22sm+2st;魁蚶2n=38,12m+20sm+6st.亚端(st)着丝点类型染色体泥蚶没有,毛蚶有1对,魁蚶有3对。3种蚶染色体组型都是以中部(m)和亚中部(sm)着丝点染色体为主要类型;染色体长度由大到小都呈比较均匀地递减;最大染色体的绝对长度都不超过5μm,最小的都在2μm左右。臂间倒位可能在染色体进化过程中起重要作用。3种蚶种间杂交是有可能的。     

VERIFICATION OF INTERNAL WAVES IN OFFSHORE AREAS BY MEANS OF CURRENT OBSERVATIONS

Based on the shear effect of internal wave currents in stratified fluid, the necessary condition for the possible existence of an internal wave and the sufficient condition under which there will be no internal wave are deduced starting from the continuity equation of incompressible fluid. The above two conditions are verified by the measured results from vertical current meter arraies at some observation stations in the Bohai Sea and the South Huanghai Sea. In the treatment of measured results, first of all, the tidal period components are separated from the measured currents by Fourier-analysis method, and then the internal wave currents of tidal period from the tidal period components in the light of some considerations. The analytical results of observed currents are well consistent with theoretical analysis. Furthermore, one can also deduce some features of internal waves therefrom. Consequently, it is concluded that the observation from a vertical current meter array is an important means to verif