长江口水质污染及生物残毒状况调查

长江口水质污染及生物残毒状况调查ＩＮＶＥＳＴＩＧＡＴＩＯＮＯＮＴＨＥＳＴＡＴＥＯＦＴＨＥＷＡＴＥＲＰＯＬＬＵＴＩＯＮＡＮＤＴＨＥＲＥＳＩＤＵＡＬＴＯＸＩＣＩＴＹＩＮＯＲＧＡＮＩＳＭＩＮＣＨＡＮＧＪＩＡＮＧＲＩＶＥＲＥＳＴＵＡＲＹ￥ＹａｏＹｅｍｅｉａｎ...     

池塘沉积物的理化性质和细菌状况的研究

池塘沉积物的理化性质和细菌状况的研究ＳＴＵＤＩＥＳＯＮＰＨＹＳＩＯＣＨＥＭＩＣＡＬＰＲＯＰＥＲＴＩＥＳＡＮＤＢＡＣＴＥＲＩＡＬＣＯＮＤＩＴＩＯＮＳＩＮＳＥＤＩＭＥＮＴＯＦＦＩＳＨＰＯＮＤＳ申玉春张显华王亮毛玉泽（内蒙古哲里木畜牧学院,通辽０２８０４２...     

VARIATIONSOFCOMMUNITYSTRUCTURE，DIVERSTITYANDBIOMASSOFDEMERSALFISHASSEMBLAGEINTHEBOHAISEABETWEEN1982～

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EXISTENCE FORMS AND DISTRIBUTION OF SELENIUM IN BLUE MUSSEL AND BAY SCALLOP

ＥＸＩＳＴＥＮＣＥＦＯＲＭＳＡＮＤＤＩＳＴＲＩＢＵＴＩＯＮＯＦＳＥＬＥＮＩＵＭＩＮＢＬＵＥＭＵＳＳＥＬＡＮＤＢＡＹＳＣＡＬＬＯＰＭａｏＷｅｎｊｕｎ１）ＬｉＹｉ２）ＧｕａｎＨｕａｓｈｉ１）ＬｉｎＨｏｎｇ１）ＬｉｕＹｕｈｕａ３ＯｃｅａｎＵｎｉｖｅｒｓｉｔ...     

盐度及钙镁离子对中华绒螯蟹大眼幼体育成Ⅲ仔蟹的成活率和生长的影响

盐度及钙镁离子对中华绒螯蟹大眼幼体育成Ⅲ仔蟹的成活率和生长的影响ＥＦＦＥＣＴＳＯＦＴＨＥＡＭＢＩＥＮＴＳＡＬＩＮＩＴＹＡＮＤＴＨＥＡＭＢＩＥＮＴＣａ２＋、Ｍｇ２＋ＣＯＮＣＥＮＴＲＡＴＩＯＮＯＮＴＨＥＳＵＲＶＩＶＡＬＡＮＤＧＲＯＷＴＨＯＦＥＲＩＯＣＨＥ...     

我国沿海水域的主要污染问题及其对海水增养殖的影响

我国沿海水域的主要污染问题及其对海水增养殖的影响ＴＨＥＥＦＦＥＣＴＳＯＦＭＡＪＯＲＰＯＬＬＵＴＩＯＮＳＯＮＭＡＲＩＣＵＬＴＵＲＥＡＮＤＦＩＳＨＥＲＹＲＥＳＯＵＲＣＥＥＮＨＡＮＣＥＭＥＮＴＡＬＯＮＧＴＨＥＣＯＡＳＴＡＬＷＡＴＥＲＳＯＦＣＨＩＮＡ贾晓平蔡...     

生物工程防治鱼类微生物病害产业化探讨

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打帮河的鱼类区系及其生态评价↑（*）

打帮河的鱼类区系及其生态评价杨仕懋（贵州省安顺地区鱼种场５６１０１８）关键词打帮河，鱼类区系，生态评价ＦＩＳＨＥＳＦＡＵＮＡＡＮＤＥＶＡＬＵＡＴＩＯＮＯＦＥＣＯＬＯＧＹＩＮＤＡＢＡＮＧＲＩＶＥＲＹａｎｇＳｈｉｍａｏ（ＡｎｓｈｕｎＰｒｅｆｅｃｔｕｒａｌ...     

COMPARISON OF LIPIDS AND NITROGENOUS EXTRACTIVES OF DANUBLAN WELS AND CHINESE CATFISH

ＣＯＭＰＡＲＩＳＯＮＯＦＬＩＰＩＤＳＡＮＤＮＩＴＲＯＧＥＮＯＵＳＥＸＴＲＡＣＴＩＶＥＳＯＦＤＡＮＵＢＬＡＮＷＥＬＳＡＮＤＣＨＩＮＥＳＥＣＡＴＦＩＳＨＸｕｅＣｈａｎｇｈｕｏ（ＯｃｅａｎＵｎｉｖｅｒｓｉｔｙｏｆＱｉｎｇｄａｏ，２６６００３）ＷａｎｇＪｉａ...     

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Epitheliocystis in fish

Epitheliocystis is a condition affecting the gills and skin of fish, which has been reported from more than 50 freshwater and marine species. It is caused by intracellular Gram-negative bacteria. Mortalities have been associated with epitheliocystis infections in cultured fish. This review provides an update of our current understanding of this condition, including characterization of the pathogen using immunohistochemical and molecular studies. In most fish species the epitheliocystis agent was negative to an antibody specific for chlamydial genus-specific lipopolysaccharide antigen. Recently, four epitheliocystis agents from four different fish species have been characterized using molecular analysis. While they all belong to the order Chlamydiales, in a lineage separate from the Chlamydiaceae, they are distinct organisms and similarity analysis showed that they had highest similarity values with other chlamydia-like bacteria isolated from various sources, including humans or pig. This confirms the high diversity and host specificity of the pathogen. Further molecular analysis should result in an increased understanding of this condition. To date the pathogen has not been cultured, making experimental studies difficult. High stocking densities, presence of nutrients, season, temperature and fish age have been identified as potential risk factors for the manifestation of this condition.     

浅谈池塘养殖鱼类浮头的预测方法

淡水池塘里的溶氧随着气温、季节、天气变化而改变。可从以下几方面进行预测：一、看天气（1）在夏秋高温季节傍晚下雷阵雨，最容易引起重浮头式泛池，夏秋季节遇上晴天吹南风、气温高，到了夜里吹北风．气温迅速下降，俗称“南撞北”，或者夜里风力较大，气温下降快，也容易引发浮头。（以上三种情况．主是是上下水层对流快，下层氧债迅速上升，增大耗氧层．使全池缺氧）。（2）遇上连绵阴雨、光照条件差．水中光合作用弱、大雾、气温低、半夜或上半夜就可能浮头。（3）久睛未雨加上大量施肥、水质肥．一旦天气转阴．不雷阵雨极易浮头。二…     

Report on the growth of rabbit fish in fish ponds in Fiji

Some data are presented about the gain in weight of rabbit fishes (Siganus vermiculatus) grown at different densities in dirt ponds.     

Leadership in fish shoals

Leadership is not an inherent quality of animal groups that show directional locomotion. However, there are other factors that may be responsible for the occurrence of leadership in fish shoals, such as individual differences in nutritional state between group members. It appears that front fish have a strong influence on directional shoal movements and that individuals that occupy such positions are often characterised by larger body lengths and lower nutritional state. Potential interactions between the two factors and their importance for positioning within shoals need further attention. Initiation of directional movement in stationary shoals and position preferences in mobile shoals need to be addressed separately because they are potentially subject to different constraints. Individuals that initiate a swimming direction may not necessarily be capable of the sustained high swimming performance required to keep the front position or have the motivation to do so, for that matter. More empirical and theoretical work is necessary to look at the factors controlling positioning behaviour within shoals, as well as overall shoal shape and structure. Tracking of marked individuals whose positioning behaviour is monitored over extended time periods of hours or days would be useful. There is an indication that shoal positions are rotated by individuals according to their nutritional needs, with hungry fish occupying front positions only for as long as necessary to regain their nutritional balance. This suggests that shoal members effectively take turns at being leaders. There is a need for three‐dimensional recordings of shoaling behaviour using high‐speed video systems that allow a detailed analysis of information transfer in shoals of different size. The relationship between leadership and shoal size might provide an interesting field for future research. Most studies to date have been restricted to shoals of small and medium size and more information on larger shoals would be useful.     

Osmoregulation in fish sperm

Fish Physiology and Biochemistry - In most fish exhibiting external fertilization, spermatozoa become motile after release into water, triggered by differences between intracellular and...     

两种液化蛋白及其在饲料中的应用

IntroductionFish silage has been produced and used as high nutrition protein resource in feed for many years in Nor-way.The main raw materials are fish offals from fish processing industry,dead fish from fish farming factoryand pelagic fish.It is now a successful and profitable industry and benefits environment protection.With therapid growth in fish farming in China,the demands for high quality protein resource are increasing.There isgreat potential for adopting silage technology in China.A…     

中国鱼粉鱼油来源及利用

鱼粉鱼油是渔业生产的重要原料,连接着海洋捕捞业与养殖业,是现阶段渔业转型工作的一个重要部分。中国自2000年以后鱼粉鱼油使用量在每年160×104 t左右,达到一个相对稳定的水平。通过梳理近10年中国鱼粉鱼油生产原料、产量和消耗情况,分析了中国鱼粉鱼油利用现状,提出了健全渔业捕捞相关法律法规、推动鱼粉行业绿色转型、加大水产动物营养生理与饲料的科研力度等方面的建议。     

A novel fish counter for fish farms

A counter for rapid counting of live fish, especially trout and salmon, has been developed. The response time of the counter is approximately 100 ms and hence a throughput of up to 10 000 fish per hour can be obtained. Results are given in the paper for counting fish of between 300 g and 1 kg with an error of less than ± 3%.     

Factors affecting fish yield and profit in fish pen culture in flooded ricefields

In recent years, a rotational system consisting of two rice crops followed by a fish pen culture during the monsoon flood period was adopted in parts of the flood-prone region of the Mekong Delta. In this paper, we use the survey data from 51 fish pen farmers at Co Do and Vinh Thanh district, Can Tho City, to investigate the factors affecting fish yield and profit in such fish pen culture system. The net yield of all stocked fish varies from 377 to 3,782?kg/ha/crop while the return above variable costs varies from ?5.3 to 9.8 million VND/ha/crop. Low fish price at harvest and the difficulty to sell below market sized fish at a period of oversupply are the main problems for fish pen culture. Fish net yield significantly increases with stocking density and is linked with specific polycultures. Common carp and bighead carp perform best in fish pen culture, both in production and profit considerations. Harvest body mass of common carp is mainly limited by increasing common carp stocking density. Therefore, a stocking density of common carp of about 6,000 fish/ha is recommended to obtain the optimum combination of reasonable body masses, and a good price, as well as a high return above fingerling costs.     

The effect of fish species combination in fish ponds on plankton composition

Abstract. In continuation of an experiment carried out in 1983, the effect of polyculture of bottom-feeding fish (common carp. Cyprinus carpio L.; tilapia hybrids, Oreochromis nilolicus (L.) × O. aureus (Steindadner); and grey mullet, Mugil cephalus (L.) and a filter-feeding fish (silver carp. Hypopluhalmichtys molitrix (Valenciennes)) on the nannoplankton and netplanklon has been studied. This effect was analysed through principal component analysis. The results confirmed the linding of 1983 that the presence of silver carp in a pond, either alone or with bottom-feeding fish, results in a decrease in netplankton (phylo- and zooplankton) and an increase in nannoplankton which passes through the tiller apparatus of the fish. The effect of the silver carp seems to be related more to its numerical density than to its individual weight, since the effect diminished with the decrease in density during 1983–1985. It became least pronounced when the density was 400/ha. Bottom-feeding fish enhance the development of the larger nannoplankton by bringing up nutrients from the bottom, but reduce the number of the netplankton (mainly zooplankton) as compared to the control pond without lish. This effect was more apparent at a higher density of tilapia. but was masked when silver carp was present.