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淡水     
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  freshwater
    THE EVALUATION OF PLAGIOGNATHOPS MICROLEPIS BLEEKER AS A NEW OBJECT IN FRESHWATER FISH CULTURE
    淡水鱼类养殖新对象细鳞斜颌鲴(简称斜颌鲴)的生产评价
短句来源
    ACCUMULATIVE CONTENTS OF FRESHWATER FISHERIES, 1988 PONDFISHERY
    《淡水渔业》1988年分类总目录
短句来源
    Study on Fatty Acid Composition of 20 Species of Fresh Water Fishes and Shrimp by Gas Chromatography
    二十种淡水鱼虾脂肪酸组成的分析研究
短句来源
    EPIDEMIOLOGICAL INVESTIGATION OF OUTBREAK DISEASE OF FRESHWATER FISHES IN ZHEJIANG PROVINCE
    浙江省淡水养殖鱼类暴发性鱼病的流行病学调查
短句来源
    Preliminary Studies on the Serum protein of Eight Species of Freshwater Fishes
    8种淡水鱼类血清蛋白质的初步研究
短句来源
更多       
  fresh water
    THE EVALUATION OF PLAGIOGNATHOPS MICROLEPIS BLEEKER AS A NEW OBJECT IN FRESHWATER FISH CULTURE
    淡水鱼类养殖新对象细鳞斜颌鲴(简称斜颌鲴)的生产评价
短句来源
    ACCUMULATIVE CONTENTS OF FRESHWATER FISHERIES, 1988 PONDFISHERY
    《淡水渔业》1988年分类总目录
短句来源
    Study on Fatty Acid Composition of 20 Species of Fresh Water Fishes and Shrimp by Gas Chromatography
    二十种淡水鱼虾脂肪酸组成的分析研究
短句来源
    EPIDEMIOLOGICAL INVESTIGATION OF OUTBREAK DISEASE OF FRESHWATER FISHES IN ZHEJIANG PROVINCE
    浙江省淡水养殖鱼类暴发性鱼病的流行病学调查
短句来源
    Preliminary Studies on the Serum protein of Eight Species of Freshwater Fishes
    8种淡水鱼类血清蛋白质的初步研究
短句来源
更多       
  fresh
    THE APPLICATION OF HYDRAULIC SEINE-HAULER IN HARVESTING FISH RAISED IN LARGE AREA FRESH WATERS
    大水面淡水养鱼捕捞应用液压大拉网起网机实例
短句来源
    Study on Fatty Acid Composition of 20 Species of Fresh Water Fishes and Shrimp by Gas Chromatography
    二十种淡水鱼虾脂肪酸组成的分析研究
短句来源
    Comparison of 17αMethyltestosterone on spermatogenesis in grey mullet of fresh water and seawater
    17α-甲基睾酮对淡水和海水鲻鱼精子发生的比较
短句来源
    The relation between fresh water fishery and the climate of water bodies.
    淡水渔业与水体气候的关系
短句来源
    The oxygen consumption rate and asphyxial point were determined in juvenile Amur sturgeon(Acipenser schrenckii) which had been acclimated to sea water(a salinity of 28) and fresh water at(20.0±0.2)℃ for up to 14 days.
    将施氏鲟Acipenser schrenckii幼鱼在淡水和海水(盐度为28)条件下分别驯养14 d后(水温为20.0±0.2℃),禁食48 h,测定了该鱼的耗氧率和窒息点。
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  fresh-water
    A New Insight into the Situation of Abrupt Epidemic Disease of Major Cultured Fresh-water Fishes
    主要淡水养殖鱼类暴发性流行病流行情况新见解
短句来源
    Study on geographical distribution of the forest stream fresh-water fish in Hainan island
    海南省森林溪流淡水鱼类地理分布研究
短句来源
    Fresh-water colossoma brachypomun were fed upon the food with 25, 50, 75 and 100mg/kg allitridum added.
    在饵料中分别添加 2 5 ,5 0 ,75 ,10 0mg/kg的大蒜素投喂淡水白鲳。
短句来源
    ON THE DISTRIBUTIONAL DIVISION OF FRESH-WATER FISHES IN ZHOUSHAN ARCHIPELAGO
    关于舟山淡水鱼类分布区划的商榷
短句来源
    A STUDY ON THE FAUNA AND GEOGRAPHICAL DISTRIBUTION OF FRESH-WATER FISHES IN ZHEJIANG PROVINCE, CHINA
    浙江省淡水鱼类区系组成及其区划地位的研究
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      freshwater
    Effect of Toxic Industrial Pollutants on the Activity and Isoforms of Acid DNase in the Freshwater Snail Viviparus viviparusL.
          
    A preparation of lysozyme from a freshwater bivalve, Unio pictorum, has been isolated by sorption to chitin, and its physicochemical properties have been studied.
          
    Respiration Rate and Species-Specific Lifespan in Freshwater Bivalves of Margaritiferidae and Unionidae Families
          
    We studied changes in the respiration rate in five species of freshwater bivalves as a function of animal age and size.
          
    The longest and shortest lifespan among the studied mollusks was specific for the pearl mussel Margaritifera margaritifera(Ru= 37 kJ and T20= 36 years) and the freshwater mussel Anodonta anatina(Ru= 8 kJ and T20= 8 years), respectively.
          
    更多          
      fresh water
    Bacterial bioluminescence was applied to detection of general toxicity (MIT test) and genotoxicity (SOS-lux test) of some chemicals, seawater, and fresh water.
          
    Studies on Biodiversity in the Plankton, Benthos, and Fish Communities, and the Ecosystems of Fresh Water Bodies Differing in Pr
          
    These changes suggest a significant role of the blood albumin system in adaptation of the Caspian sturgeon migratory species to fresh water life conditions.
          
    Fresh water lenses formed by seepage from irrigation channels
          
    A two-dimensional model of a steady-state fresh water lens, formed above saline water as a result of mole irrigation, is investigated in the hydrodynamic formulation [1].
          
    更多          
      fresh
    Results showed that arbuscular mycorrhizal (AM) inoculation significantly improved the height, stem diameter, and fresh weight of P.
          
    The forest litter layer can be divided into fresh litter layer (L), fermentation layer (F) and humus layer (H), which may represent different litter decomposition stages.
          
    In contrast to those in the soil, the soil animals in the litter layer generally tended to increase in both group abundance and density from the top fresh litter layer to the bottom humus layer.
          
    Compared with non-transgenic plants, the fresh fruit length of T4 generation of transgenic papaya increased 2.6%-5%, and the diameter decreased 0.6%-1.5%.
          
    The flesh thickness of fresh fruit increased 12%-15%, which made it fitter for eating.
          
    更多          
      fresh-water
    Shape of the fresh-water lens resulting from canal seepage
          
    Sulfur Compounds in Bottom Sediments of Fresh-Water Basins (Mouth of the Severnaya Dvina River and Rybinsk Water Reservoir)
          
    Contents and correlations of some trace elements (Sr, Li, F, Ba, and others) indicate that primary sediments formed under humid-semihumid paleoclimate in a fresh-water paleobasin (lagoon) characterized by occasional increase in salinity.
          
    The operation conditions of the inner surface of the long-distance Astrakhan-Mangyshlak fresh-water main and the properties of corrosion deposits on it are considered.
          
    In ornamental carps from the collection of the Experimental Station, All-Russia Research Institute of Fresh-Water Fisheries, fish with a dirty dark tint of body color among orange and white fish were found.
          
    更多          


    This herbivorous bream (Megalobrama amblycephala Yih) occurs wild in certainlarge and median-sized lakes of the mid-lower Yangtze basin and was not found elise-where.Since its recognition in 1955 as a new species distinct from Megalobramaterminalis,to which it bears a superficial resemblance,it has been subjected to generalbiological studies as well as pond-culture experimentation.Observations made in our hatcheries indicate that this bream is much more resis-tant to bacterial diseases than the well-known grass...

    This herbivorous bream (Megalobrama amblycephala Yih) occurs wild in certainlarge and median-sized lakes of the mid-lower Yangtze basin and was not found elise-where.Since its recognition in 1955 as a new species distinct from Megalobramaterminalis,to which it bears a superficial resemblance,it has been subjected to generalbiological studies as well as pond-culture experimentation.Observations made in our hatcheries indicate that this bream is much more resis-tant to bacterial diseases than the well-known grass carp (Ctenopharyngodon idellus),which is highly esteemed by our pisciculturists on account of its big size,quickgrowth,tastefulness,and herbivorous food habit,yet on the other hand,it is alsonotorious for its susceptibility to bacterial infections.Except for the smaller size,this bream has as many favourable features as the grass carp and is,in other respects,even superior to the latter.Of particular interest is that this bream can matureand breed spontaneously in ordinary fish ponds.In middle Hupei,this bream spawns from late April to early June.Its eggs,like those of the common carp and goldfish,are of the adhesive type and can beincubated in the same way as for incubating goldfish eggs.But the rearing of itsfry,which are so small and delicate,is more difficult.In our experimentation forrearing the fry,better results have been obtained by letting the eggs and the newly-hatched larvae stay in the hatching pond until the fry grow to inch-sized fingerlings,in contrast to the ordinary practice (for various carps) in which the fry are to betransferred to the rearing pond shortly after they become capable of swimming abouthorizontally.At a water temperature of 26—28℃,the eggs hatch in 24—30 hours,with anaverage hatching rate of 60% both in indoor incubation and in the pond.When the yolk sac of the larvae is nearly absorbed,the fry feed first on rotifersand nauplii,but soon become large enough to feed on cladocerans and copepods.Ifthe pond is rich in zooplanktaon,the fry will grow fast with little mortality.Theproduction of natural food organisms should be promoted by manuring the hatching-rearing pond,although care should be taken not to overfertilize.Fingerlings of this bream when reared in ponds even without any prophylacticprecautions will grow nicely on vegetable diet and very rarely get bacterial infections,so they have much better chance of surviving as compared with the grass carp.Thisis also the case with the yearling cultures.Experimental polycultures with bream andgrass carp indicated that the bream had a survival of 84—89%,while the grass carp had a survival of only 14—14.5% because of bacteriai infections.Fingerling bream 10—13 cm in total length stocked in the pond at the rate of2500—3000 fish per mou will in the course of one year attain to a weight of 300 gramsper fish,which is a good size for the market,whereas fingerling grass carp usuallytakes two years to grow to its market size,thus the tempo of pond utilization can bequickened one year by raising the bream.The bream is fairly tame and easy to seine.In pond culture,the first seiningwould catch about 70% of the individuals present.In short,this bream has many favourable features to fullfil the requirements ofan excellent fresh-water food fish and is worthy of being propagated and raised.Ithas already been successfully cultured in most provinces of our country at present.

    团头鲂原是一种野生的草食性淡水鱼类,从1960年起对它进行了一系列的观察试验,肯定它有以下六个优点:(1)在池养条件下,性腺能发育成熟;(2)以各种草类为主要食料;(3)抗病力强、成活率高;(4)容易捕捞、起水率高;(5)含肉量高,脂多、味美;(6)一年半可长至商品规格。试验结果证明团头鲂可以作为新的养殖对象,同时也提供了一套繁殖、饲养管理方法。1964年到1973年已有二十一个省市先后进行移殖饲养,有的已就地繁殖、推广。本文系历年试验和部分移殖经验的总结。

    Being rich in nutrition,freshwater diatoms are favored food of many aquaticanimals.In 1973,experiments were started to investigate the possibilities of culturingdiatoms as a source of food for the larvae of crabs,shellfish and other aquatic ani-mals.Through screening and cultivation for about a year,we have sorted out 4species of freshwater diatoms suitable for mass culture from the environs of Wuhan,namely,Nitzschia fonticola,N.palea,Hantzschia amphioxys,and Cyclotella meneghi-niana.N.fonticola has been chosen...

    Being rich in nutrition,freshwater diatoms are favored food of many aquaticanimals.In 1973,experiments were started to investigate the possibilities of culturingdiatoms as a source of food for the larvae of crabs,shellfish and other aquatic ani-mals.Through screening and cultivation for about a year,we have sorted out 4species of freshwater diatoms suitable for mass culture from the environs of Wuhan,namely,Nitzschia fonticola,N.palea,Hantzschia amphioxys,and Cyclotella meneghi-niana.N.fonticola has been chosen for a series of cultivation experiments.The lipidand protein contents,as well as 15 amino acids,are determined quantitatively.Wehave also prepared two new culture media,“HB-D 1”and“HB-D 2”,which provesatisfactory for the propagation of diatoms.The optimum temperature for the growth of N.fonticola is 20—30℃,optimumlight intensity,2,000—5,000 lux.We have observed the regularity of the absorptionand consumption of nitrogen,phosphorus and silicon by N.fonticola in both themiddle-scale experiment and the mass culture.Under our culturing conditions,itseems that silicon is the principal limiting factor.In the middle-scale experiments,whenthe nutritional elements were supplied in time throughout a period of 15 days,the cellcount increased up to 23×10~6/ml,O.D._(420nm)=40,corresponding to a yield of2.76 grams dry weight per litre.In the 30-litre mass culture experiment,harvestedone-sixth the total amount of the culture every 2 days,a yield corresponding to 7grams dry weight each time has been obtained consecutively.The culture removedwas replaced by fresh medium.Judging from our experimental results,we presumethat a steady high yield could be obtained should the culture be harvested every2.5 days at the rate of 1/6 each time.

    淡水硅藻是水生动物的营养丰富的食料。经过一年的筛选培养,我们获得了四种适于大量培养的种类,即:泉生偏缝硅藻(Nitzschia fonticola Grun.),椿状偏缝硅藻(Nitzschia paleaSmith.),双尖菱板硅藻(Hantzschia amphioxys Grun.)和梅尼小环硅藻(Cyclotella meneghini-ana Kütz.)。我们选择泉生偏缝硅藻进行较为系统的培养试验,对其营养成分进行了分析,并对其所含的15种氨基酸进行了定量。同时配制了两个新的适于硅藻生长繁殖的培养基“水生硅1”和“水生硅2”。泉生偏缝硅藻最适生长温度为20—30℃,光强为2,000—5,000米烛光。观察了泉生偏缝硅藻在中型培养和大量培养中氮、磷、硅的吸收消耗规律,发现在培养条件下,硅是主要限制因子。在中型培养中,连续培养15天,适时补充营养元素,硅藻细胞数可高达23×10~6个/毫升,产量为2.7克干藻/升。在30升大量培养中获得每两天收获一次,每次收获1/6(相当于硅藻干重7克)的连续生产性培养的结果。根据实验结果推算,若两天半收获一次,每次收获1/6,可获得持续稳定高产。

    TNT, BHC, DDT, Parathion and HgCl2 were used separately in acute toxicity tests on the Silver Carp, Hypophthalmichthys molitrix. Serum glutamic oxalocetie transaminase activity level in the treated fish was significantly increased. Glutamic pyruvic transaminase level was effected by Parathion. The degree of elevation of serum trausaminase activity is related to the concentration of mercuric chloride.The age and species of various Chinese freshwater Cyprinids, different types of water bodies, short term starvation,...

    TNT, BHC, DDT, Parathion and HgCl2 were used separately in acute toxicity tests on the Silver Carp, Hypophthalmichthys molitrix. Serum glutamic oxalocetie transaminase activity level in the treated fish was significantly increased. Glutamic pyruvic transaminase level was effected by Parathion. The degree of elevation of serum trausaminase activity is related to the concentration of mercuric chloride.The age and species of various Chinese freshwater Cyprinids, different types of water bodies, short term starvation, disturbance and cage culture all had no effect on serum transaminase activity.But a rise in water temperature or an impoverishment of dissolved oxygen content to a level below 1 ppm increased fish serum glutamic oxalocetie transaminase and glutamic pyruvic transaminase activity. Pish serum glutamic oxalocetie transaminase activity is correlated to water temperature.

    以三硝基甲苯(INT)、六六六、滴滴涕(DDT)、对硫磷(E-605)、氯化汞分别进行白鲢鱼种的急性致毒实验,与对照组相比,鱼血清谷草转氨酶活性显著增加;对硫磷还引起血清谷丙转氨酶活性的升高。血清转氨酶活性增加的程度与氯化汞浓度相关。不同种类的我国淡水鲤科鱼类、不同鱼龄、不同水体以及短期饥饿、惊扰及网箱饲养对血清转氨酶活性没有影响,但水温升高或溶氧低于1ppm会使鱼血清谷草转氨酶活性升高。水温与鱼血清谷草转氨酶活性有相关性。

     
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