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   幼鱼 在 生物学 分类中 的翻译结果: 查询用时:1.645秒
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幼鱼     
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  juvenile
    Effects of pH on α-amylase activity of larval, juvenile and young Pagrosomus major
    pH对真鲷仔稚幼鱼α-淀粉酶活性的影响
短句来源
    Study on the Feeding Habit and Feeding Rhythm of Juvenile Acanthogobius flavimanu
    黄鳍刺鰕虎鱼(Acanthogobius flavimanu)前期幼鱼摄食习性和摄食率的初步研究
短句来源
    Studies on the Standard Metabolism and Total Metabolism of Juvenile Plectorhynchus Cinctus
    花尾胡椒鲷幼鱼的标准代谢率及总代谢率
短句来源
    EFFECT OF LECITHIN ON THE Ca~(2+)-ATPASE AND Na~+,K~+-ATPASE ACTIVITIES OF JUVENILE Plectorhynchus cinctus
    卵磷脂对花尾胡椒鲷幼鱼Ca~(2+)-ATP酶和Na~+,K~+-ATP酶活性的影响
短句来源
    Studies on the Correlation between Serum VTG and Serum Calcium of Juvenile Carassius auratus after Exposure to E_2
    E_2诱导的鲫鱼(Carassius auratus)幼鱼血清中卵黄蛋白原和钙含量相关性研究
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  young fish
    The experiment also found that the young fish(12cm)was not sensitive to the toxic alga,and could survive during the exposure to algal cells at 10,000 cells·ml-1 for ten days.
    较大的幼鱼(12cm)对有毒藻不敏感, 暴露在10,000 cells·ml-1 10d后,存活率为100%。
短句来源
    for young fish is 3.0. The other peak activitiesemerge in pH 2. 5, 5. 0~6. 0 in juvenile, and the other peak activities emerge in pH 2. 5, 5. 5and 7. 5 in young fish. It is suggested that the descend of the most suitable pH for α-amylaseas the growth of P. major is due to that development and the perfecting of the digestive sys-tem.
    稚鱼期α-淀粉酶的最适pH为4.0,在pH为25和5.0~60时出现小的活性峰值; 幼鱼期α-淀粉酶活性的最适pH为3.0,在pH为2.5、5.5、7.5时也出现小峰值。
短句来源
    The daily growth rate of larval fish at a temperture of 25℃ is about 0.2 mm during the first half month. The daily growth rate of the juvenile fish is about 1.0 mm, and that of the young fish about 1.5 mm.
    在25℃条件下,前半个月仔鱼日增长约0.2mm,稚鱼期日增长约1.0mm,幼鱼期日增长约1.5mm。
短句来源
    The ratios of essential and semi essential amino acids for the human beings to the total ones were 51.7% and 58.9% in adult and young fish respectively.
    必需氨基酸和半必需氨基酸含量较高 ,占总氨基酸的 5 1 .7% (成鱼 )和5 8.9% (幼鱼 )。
短句来源
    MORPHOLOGICAL STUDIES OF THE EGGS,LARVAE AND YOUNG FISH OF THE BLACK PORGY,SPARUS MACROCE-PHALUS (BAS1LEWSKY)
    黑鲷卵子及仔、稚、幼鱼的形态观察
短句来源
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  juvenile fish
    The daily growth rate of larval fish at a temperture of 25℃ is about 0.2 mm during the first half month. The daily growth rate of the juvenile fish is about 1.0 mm, and that of the young fish about 1.5 mm.
    在25℃条件下,前半个月仔鱼日增长约0.2mm,稚鱼期日增长约1.0mm,幼鱼期日增长约1.5mm。
短句来源
    The re-suspended cells showed similar strong impact as the culture on the survival of the juvenile fish, and the cell content also resulted in significantly such adverse effect, however, the other fractions did not produce any obvious toxicity. The results indicated that PSP toxins ingestion may be the lethal factor to the juvenile fish mortality.
    通过藻细胞悬浮液、去藻过滤液、细胞内容物以及细胞碎片的毒性大小比较研究,发现藻细胞的毒性作用较强, 与藻液相近, 细胞内容物也有显著影响, 其他组分无明显的毒性作用,结果表明摄入PSP毒素可能是幼鱼致死的原因。
短句来源
    IGF I mRNA expression of 7-month old juvenile and 2-year old adult common carp were determined by RNase Protection Assay. Results showed that the hepatic IGF I mRNA level of adult fish was significantly higher than that of 7-month old juvenile fish;
    利用RNA酶保护法对 7月龄性未成熟幼鲤和 2龄性成熟鲤组织胰岛素样生长因子 -I(IGF -I)mRNA的表达水平进行测定 ,结果表明成鱼肝和肾脏组织IGF -ImRNA的丰度显著高于幼鱼
短句来源
  “幼鱼”译为未确定词的双语例句
    The toxic effects of tributyltin chloride (TBTC1) and octylphenol (OP) on the guppy Poecilia reticulates or rabbitfish Siganidac oramin were estimated via the static exposure experiments or through food. (1) When the guppy larvae were exposed to 1.25-7.90 μg/L TBTC1, the 50% lethal concentration at 96h was 5.82 μg/L.
    通过静态暴露或拌饲投喂方式,研究三丁基锡氯化物(TBTCl)、辛基苯酚(OP)对孔雀鱼和黄斑蓝子鱼的毒性效应.(1)当孔雀鱼幼鱼暴露于1.25~7.90μg/L TBTCl中,其96h的半致死浓度为5.82μg/L;
    Effect of different proteinic level of artificial diet on the growth rate and the structure of digestive glands of Silurus meridionalis in larva
    不同蛋白质水平人工饵料对南方鲇幼鱼增长率和消化腺结构的影响
短句来源
    The embryonic and larval development of Tor brevifilis brevifilis
    瓣结鱼的胚胎及幼鱼发育
短句来源
    From March, 2002 to Dcember 2002 the resting metabolic rates for 66 fish of Pelteobagrus vachelli (Richardson) larves, which were collected from Jialing River in Beibbei with weight ranging from 7. 2g to 9.4 g, were measured by continue梖lowing respirometer at the temperatures of 15℃, 18℃, 21℃, 24℃,27℃ and 30℃, respectively.
    于2002年3月至2002年12月,以由嘉陵江北碚江段采集到的瓦氏黄颡鱼(Pelteobagrus vachelli (Richardson))幼鱼作为实验材料,采用流水式呼吸仪,分别在15℃,18℃,21℃,24℃,27℃和30℃水温条件下,测定了66尾鱼体(体重范围7.2——9.4g)的静止代谢率。
短句来源
    The author used aromatase (enzyme for estrogen synthesis) inhibitor (fadrozole), estrogen receptor antagonist (tamoxifen) and methylteslosterone(MT) to administrate the artificial fertilized all female Southern Catfish(Silurus meridionalis Chen) from 5 day after hatching(dah) to 48 dah by oral administration.
    用芳香化酶(雌激素合成酶)抑制剂(aromatase inhibitor,AI)Fadrozole、雌激素受体拮抗剂tamoxifen、MT(methyltestosterone,MT)在孵化后5天(dah,day after hatching)到48dah以不同剂量投喂处理了人工授精孵化的南方鲶全雌幼鱼
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  juvenile
An experiment was conducted to study fatty liver disease caused by different ether extract levels in diets of juvenile Sciaenops ocellatus.
      
Study results indicated that all the nine kinds of diets with different lipid or protein levels could cause nutritional fatty liver disease in juvenile S.
      
The increase in the level of ether extract in test diets was responsible for the direct cause of illness or death in juvenile S.
      
It can be concluded that the germination and juvenile resistance of Chinese pine seeds under drought stress are enhanced after laser processing.
      
For juvenile bullfrogs, these were Decapoda, Coleoptera, Cypriniformes, Odonata, Orthoptera, Hymenoptera, Lepidoptera larvae, Mesogastropoda, and Raniformes.
      
更多          
  young fish
Maintaining the young fish in containers with water current facilitates swimming performance and development of feeding behavior.
      
In years with high river discharges larger parts of the floodplain are inundated, increasing the surface area of suitable nursery grounds for young fish stock.
      
Young fish could consequently benefit from high turbidity levels that can provide a protective cover, reducing predation pressure.
      
decadactylus feeds mainly on small seasonally alternating varieties of crustaceans and young fish.
      
Calculation of production rates revealed that the young fish were the most active part of the population and that females were more productive than males.
      
更多          
  juvenile fish
High genetic differentiation of both natural and "hatchery" juvenile fish was revealed.
      
Larvae of the second group had severe pathologies of inner organs that caused 100% mortality before the age of 15 days, but no pathomorphological changes in the organs of larvae and juvenile fish of the third group were revealed for up to 40 days.
      
taczanowskii is a polyphage (it more often eats amphipods, decapods, and juvenile fish).
      
Alteration of thermoregulation behavior in juvenile fish in relation to satiation level
      
Significant alterations of thermoregulation behavior appear in juvenile fish one day after food deprivation.
      
更多          
  juvenile fishes
I examined whether foraging mode in na?ve neonatal snakes was phenotypically plastic or canalized and I compared handling times and capture efficiencies for different prey types (juvenile fishes and frogs) between neonatal and adult snakes.
      
It was estimated that a large proportion of the trade was in juvenile fishes and almost all fish were less than 10?cm in standard length.
      
Recolonization proceeded rapidly and was primarily by juvenile fishes well beyond larval metamorphosis.
      
Hydrography and distribution dynamics of larval and juvenile fishes in the coastal waters of the Tanshui River estuary, Taiwan,
      
Substrate use and temporal pattern of recruitment in juvenile fishes of the Mediterranean littoral
      
更多          


An investigation on the fishing methods of lake Hung Hu was made by the auther in 1959.The fishing method of“san”is of special interest.In this paper some discussions on it’s history, (?)echnique and the cause of migration will be made;and the appreciation of this method will also be given. Ⅰ.History The said fishing method was mentioned in a Chinese book as early as 221 B.C.It is,of no doubt that our country was the first to us this method in fishhag,which has remained in application for thou- sands of years...

An investigation on the fishing methods of lake Hung Hu was made by the auther in 1959.The fishing method of“san”is of special interest.In this paper some discussions on it’s history, (?)echnique and the cause of migration will be made;and the appreciation of this method will also be given. Ⅰ.History The said fishing method was mentioned in a Chinese book as early as 221 B.C.It is,of no doubt that our country was the first to us this method in fishhag,which has remained in application for thou- sands of years and still kept it’s features up to the present time. The method of“San”may often be classified into two types:natural and artificial.Changing with the different seasons,there are three forms of the natural“San”:Spring“San”,autumn“San”,and winter“San”. Ⅱ.Technique Here the artificial“San”,which is more complicated and important is to be introduced. The fishing—ground is chosen in late autumn or early winter at the inlet of the lake or at a sport with small current where many loppings of trees or bushes are put into the bottom of lake,which is usually named the“CENTER OF SAN”.Around the center bundles of herbaceous plants should be sank into the bottom of lake at certain distance,nearer the center than the outside.But in doing so,the bundles should not be set too thick,in order that the sunlight may shine upon the water. One month or more when the work mentioned above has been accomplished,bamboo palings, immerged two-thirds of half in water,are placed around the fishing-ground on a fine and sunny day. The placing of bamboo palings is an important part of the whole scheme;it requires both speed and close-setting.For this purpose,20-30 bamboo palings are placed on between deck of each boat,slant on the front but vertical behind.At least,three men are needed to control each boat:the first to drag pa- lings into water from the deck,the second to hammer them in the bottom of lake,and the third to roll the boat backwards,so as to much strength the first man and also to escape the blockade of the palings. Some wood-slices may used to joint the palings together.Choose a sintable sport between two palings,and 1-4 or more fish-pits are well-arranged.Later on,a sort of special hand-nets is used to fish out from the fish-pits.And then,the bundles of herbaceous plants may gradually be removed; the loppings of trees or bushes also gradually removed toward the center.Finally,the lopping at the center are removed by using 4 palings to separate the center into 5 parts.And then a casting-net or other nets are used to capture the fish. Ⅲ.Analysis of the cause for congregation of fish Alnumber of scientific workers have discussed the cause of the congregation of fish by the fishing method of“San”.There remain argument about the subject.Most of them believe that the con- gregation is dosely related to the temperature,the desolved oxygen and food besides in the water,as well as to the defence against the attachs from the enemy.The author agrees with this cpinion. According to the author’s opinion,however,the response of fish to lower temperature has shown in two different forms.Some fishes the winter-migrators for exalpale,at lower temperature,seek a habit at with higher temperature.Based upon the author’s observation,be found that the younger fish especially like to live at higher temperature equivalent to slightly above body temperature.Therefore,unless the take in too shallow(1-3 M),they do not enter the fishing-ground of“San”,but prefer to go to deeper water.Some other fishes adapt themselves to lower temperature by decreasing the metabolism of the body.Their activities,therefore,are limited with in a small area,where is plenty of food and desolved oxygen,and the temperature is always above the lowest limit of living,and it is also a safe environment for them to live in.The“San”fishing-ground is sufficient for this environment.As for the other fishes, they may come into the fishing-ground by man’s interference. Ⅳ.Appreciation of the Fishing Method of“SAN” So far as the author’s observation is concerned,the fishing method of“San”is a relatively better fishing method.It differs from other methods not only in tools but in fishing-ground.And it also gets a better catch,especially in those lakes with shallow water and thick vogetation.Beside,by making use of this method,we can protect the young fish.Judging from what has been mentioned above,the author regards“San”as a good method for fishing.For improvement the author offer some suggestions as follows: 1.The vegetation of nature“San”fishing-ground may be destroyed by 1own-mower or the plant cut down at certain intervals. 2.The simplification of“San”is the better than others,which are simplicites at tools and process of fishing,if so that use cormerant instead of men to drive fish,such a result is better of possibility. 3.Limit or decrease the application of spring and autumn“San”.For during those seasons,the fish will spawn on vegetation and become fat gradually,it is not proper to catch them,thus protecting the fish as well as having annual catches. 4.For the purpose of making“San”earlier in unfavourable seasons,control the water-loyal by. means of sluice-gate.

渔具渔法种类繁多,罧业渔法是我国淡水湖泊常见渔法之一。这种渔法在渔需物资、渔坊等条件与其它渔具不同,特别是在浅水多水草湖泊中捕鱼能起其它渔具所不能起的作用;不仅渔获量高,收益大,同时还具备诱大鱼的特点,有利于繁殖保护。然而关于罧业渔法尚未得到系统的整理。作者综合了白洋淀、梁子湖以及在洪湖实地调查的赘料,写成本报告。目的在总结我国罧业渔法经验,探讨罧雾(?)诱集鱼群的原因,并提供一些改进意见,希望在我国淡水渔捞业上起一点促进作用。我国是世界上最早用罧捕鱼的国家,记载首见于春秋战国时代,现在作法与古时记载基本相同。现这种渔法已沿用了一千多年了。罧业渔法依其作业的性质可分为生霖和熟霖两类:前者是用帘包围天然鱼群集聚区,除草缩小包围圈捕捉,而后者则是人造的。生罧依作业季节不同可分春罧、秋罧和冬罧。熟罧以适应水位和其它条件又有倒把式罧和简化罧的区别。生罧渔法适应于多水草的浅湖,熟罧则适应水草较少的湖泊。作业时除船外,主要用具为帘子(竹质最好),附属用具有长柄弯镰、通篙及抄纲。生罧、熟罧罧(?)条件虽有不同,但均要求底质低凹、富于淤泥,水深2—2.5米,位近港口或注水河道的迥水区,水色不过于混浊,有一定的水草(生罧则以多...

渔具渔法种类繁多,罧业渔法是我国淡水湖泊常见渔法之一。这种渔法在渔需物资、渔坊等条件与其它渔具不同,特别是在浅水多水草湖泊中捕鱼能起其它渔具所不能起的作用;不仅渔获量高,收益大,同时还具备诱大鱼的特点,有利于繁殖保护。然而关于罧业渔法尚未得到系统的整理。作者综合了白洋淀、梁子湖以及在洪湖实地调查的赘料,写成本报告。目的在总结我国罧业渔法经验,探讨罧雾(?)诱集鱼群的原因,并提供一些改进意见,希望在我国淡水渔捞业上起一点促进作用。我国是世界上最早用罧捕鱼的国家,记载首见于春秋战国时代,现在作法与古时记载基本相同。现这种渔法已沿用了一千多年了。罧业渔法依其作业的性质可分为生霖和熟霖两类:前者是用帘包围天然鱼群集聚区,除草缩小包围圈捕捉,而后者则是人造的。生罧依作业季节不同可分春罧、秋罧和冬罧。熟罧以适应水位和其它条件又有倒把式罧和简化罧的区别。生罧渔法适应于多水草的浅湖,熟罧则适应水草较少的湖泊。作业时除船外,主要用具为帘子(竹质最好),附属用具有长柄弯镰、通篙及抄纲。生罧、熟罧罧(?)条件虽有不同,但均要求底质低凹、富于淤泥,水深2—2.5米,位近港口或注水河道的迥水区,水色不过于混浊,有一定的水草(生罧则以多水草为主要条件),背风向阳,环境安静。罧(?)确定后,如生罧渔法,即用长柄弯镶除草,挖帘路下帘包围鱼群,以后则以分片除草下间帘的方式缩小范围,作法与下述熟罧基本一致.熟霖罧(?)确定后,先在罧(?)的中央投放一定数量的树枝和篙草做成罧心,围绕罧心等距离地插上些草把(岗柴或芦苇每4—10根一束),由里向外逐渐稀疏,罧(?)随告建成,经一段时间禁畜后,即可围帘起罧捕鱼。下帘的目的在包围隐蔽在罧(?)内的鱼群,为了防止鱼群受惊逃避,要求动作迅速。为达到此目的,帘子在船上安放的方式很为重要;通常每只船载20—30个帘子,当第一个帘子上船时就以折迭方式横置中仓,起初一折约1/2米宽,每折至船头方向时均向外逐渐放宽,务使帘子的边绿终止在船头方向。以后上船的帘子沿着先一个帘子的终点起以同一方式折迭,亦逐渐向船一头方向放宽.如是,全部帘子堆起来近船头一方呈斜坡形,近船尾方向的一边为垂直的。下帘时三人共船。其中两人站在船关,一人拉帘入水井扶直,另一人用木锤打稳,第三人则倒划着船走,这样既便于拉帘入水,又可避免竖起来的帘子所阻挡,加速下帘工作。两帘交界处要有复迭的边绿,以便利用木片联结。罧(?)被帘子包围后,通常要检查一遍,不妥处要予以修整。然后再选择适当的地方以旋箔的方式安装取鱼部(鱼溜)。并定期在其中用抄纲捕捞。缩小罧(?)有两种方式:一为沿着即将拆除帘子的一边割除水草(生罧)或移去草把(熟罧)至一定范围时,在近罧心的地方另下间帘,然后再拆除同边的帘子。另一为拆除同边的帘子并把它移向内方.除草或移草把时就起赶鱼的作用。有时为慎重起见还须结合船队用通篙击水赶鱼。特别是采用后一种方式时,赶鱼尤属重要。起罧下间帘、赶鱼必须遵循两个原则:1.早不移东,晚不移西。这是因为斜光映帘入水警戒着鱼群不敢外逃,早晨拆除东边帘子便会除去这个警戒线界,稍微不慎即可造成逃鱼缺口。晚不移西也是同样道理。2.赶鱼下间帘只能沿着一方前进,每天只能下1—2边,顶多也不超过3边,不能4边一齐进行。因为4边一齐进行鱼群没有停息的机会,往往会造成炸罧(注1)遇有炸罧情况发生时要采取相应措施(暂时的停止工作或修补帘子),防止逃鱼。当罧(?)缩得很小时,最后起鱼有两种方法:一种是从罧心赶鱼,使其进入取鱼部用抄网捕捉;另一种是除去罧心并下间帘把罧心分格,配合罩纲、挟纲从事捕捞。进行罧心分格的方式很多,通常是下四道帘子把罧心分成五格,称五花式。起鱼完毕后,倘在渔期,尚须重建罧(?)。如渔期已过,需要把帘子、草把等移至岸边并加保管。以备来年再用。罧(?)渔获物随设罧地区鱼类区系特点而异,同一地区常随设罧的季节而不同,鱼类之所以进入罧坊在于罧(?)内的某些条件或全部条件(水温、溶氧、饵科及其它)能满足鱼类的需要。春罧在一定程度上诱捕到沿岸水草丛中觅食和产卵的鱼类(白洋淀、大同湖),因之,鲤、(?)占很大比重,秋罧大都捕捉在浅水区觅食的鱼类。人的有意识的在罧区外开展其它渔具作业,也是鱼类进入罧(?)原因之一。依作者观察:鱼类对低温条件的反应有两种方式,并且是逐渐进行的。一种是随着低温条件的来临,鱼类游向温度较高的水域——通常是比较深的水域——并在那里渡过低温期。这是因为较深的水域水文学条件比较稳定的关系,既是有变化也不象浅水区那样骤烈;另一种方式是随着环境条件的变更以调节其代谢作用的过程,减少活动并增强其摄食量是这一适应的具体表现。鱼类以那一种方式渡过低温期,常受其栖居环境条件的影响。看来洪湖的鱼类是以后一种方式渡过为时很短的冬季。虽然罧区与其它水面具有几乎是相同的水温、溶解氧、pH 等条件,但铒料基础却显得丰富些。在其它诸条件相同时,饵料基础的增加,绣集某些鱼类的集中,已经为实践所证明。罧(?)中主要经济鱼类的幼鱼(体长20厘米以下的个体)较少,可能与幼鱼需要较高的温度条件有关.依据渔民的经验和一些不完整的调查资料(表2)来看,有迹象表明:在低温条件下较深水域中幼鱼较多。由于罧(?)水深在2—2.5米之间,因此在有深水条件存在时,可能罧(?)中幼鱼比较少。至于表中深浅水中大小鱼交叉的现象,可能与鱼类代谢作用有极大的伸缩性有关。罧业渔法经济效益较大(见表3)。已往因一次投资大、劳力多、应用不广。人民公社化为这一渔法的普遍应用提供了可能性。作为改进的意见有:1.生罧可以用间隔除草法,省劳力又可争取时间多捕鱼。如能用除草机更好。2.春罧主要捕捉那些即将到沿岸区水草丛中产卵的鱼类影响鱼群数量补充和年产量,可以少发展。3.简化罧(?)蓄禁期短,投资少,省劳力,作业期长,收益较大,可以多加提倡。4.在反常季节可以充分利用泄水闸控制水位,以便利设罧。非不得已不采用倒把式罧,据称其渔获量不如熟罧为高。

This paper is an investigation report on the fisheries of the Ningsia region in the years from 1962 to 1963. Seventeen species of fishes were collected. Their orders, families and species are as follows: Cypriniformes Cyprinidae Cyprinus carpio Linn. Carassius auratus Linn. Squaliobarbus curriculus (Rich.) Pseudorasbora parva (Temm&Schl.) Leuciscus waleckii (Dyb.) Saurogobio dabrya Bleeker Rhinogobio cylindricus Gunther Megagobio nasutus Kessler Gobio gobio cynocephalus Dyb. Gobio rivuloides Nichols...

This paper is an investigation report on the fisheries of the Ningsia region in the years from 1962 to 1963. Seventeen species of fishes were collected. Their orders, families and species are as follows: Cypriniformes Cyprinidae Cyprinus carpio Linn. Carassius auratus Linn. Squaliobarbus curriculus (Rich.) Pseudorasbora parva (Temm&Schl.) Leuciscus waleckii (Dyb.) Saurogobio dabrya Bleeker Rhinogobio cylindricus Gunther Megagobio nasutus Kessler Gobio gobio cynocephalus Dyb. Gobio rivuloides Nichols Coreius septentrionalis (Nichols) Coreius styani (Gunther) Sluridae Parasilurus asotus Linn. Cotidae Misgurnus anguillicaudatus (Gantor) Leptobotia citanratea Nichols Barbatula postventralis Nichols Periciformes Eleotridae Hypseleotris swinhones (Gunther) Among all the species mentioned above the following are of economical importance, namely: Cyprinus carpio, Carassus auratus, Parasiurus asotus, Squiliobarbus curriculus, Leuciscus waleckii, Coreius septentrionalis and Megagobio nasutus etc. Their annual output are about 120 tons. There are more than ten fishing tools in this region, but using fishings and fish-torpedoes has proved to be harmful to the resources offishes. As to the fauna, there are no special Central-Asia species in this region, and the species of Chiang-Huai plain are lacking also. Cyprinus carpio and Carassus auratus are the domininant species. No doubt, the Leucisces walckii and Carassus auratus are the species of the complex of the northern plain.

笔者等自1960—1963年7月对本区渔业进行了调查,调查地区包括西南起自青铜峡,东北至于石咀山的全程黄河本流及其附属水本,内容涉及鱼奖区系的组成,渔具及主要经济鱼类的生物学。 (一)境内黄河水质总硬度为11.2—29.6;透明度为0.75—3厘米:pH7.4—3.4;溶解氧4.5—57毫克/升;磷酸盐0.666—0.612毫克/升。境内黄河中的浮游生物种类不多,计有波纹矽藻(Cymatopleura)新月矽藻(Cymbella)等15种浮游植物;浮游动物比较贫乏,习见的为桡足类幼虫及中剑(Mesocyclops),底悽动物有跳虾(Gummarus),蜻蛉科(Libellulidae),扁蜉科(Ecdyuridae),浮蜉科(Ephemeridae)及摇蚊科(Chironomidae)幼虫,软体动物有田螺(Bellamya)及蚬(Corbicula)。黄河主要附属水体为一些大的由下陷地区所形成的不定型的洼地浅水湖泊,面织约20万市亩。由于引黄灌溉,这些湖泊一方面接受稻田所排之水,同时又以排沟泻入黄河,起蓄洪作用。湖泊的特点是水生植物从生,敞水区较小,硫化氢含量高,冬季覆冰期长,因覆冰而引起的冬季窒息现象年有发...

笔者等自1960—1963年7月对本区渔业进行了调查,调查地区包括西南起自青铜峡,东北至于石咀山的全程黄河本流及其附属水本,内容涉及鱼奖区系的组成,渔具及主要经济鱼类的生物学。 (一)境内黄河水质总硬度为11.2—29.6;透明度为0.75—3厘米:pH7.4—3.4;溶解氧4.5—57毫克/升;磷酸盐0.666—0.612毫克/升。境内黄河中的浮游生物种类不多,计有波纹矽藻(Cymatopleura)新月矽藻(Cymbella)等15种浮游植物;浮游动物比较贫乏,习见的为桡足类幼虫及中剑(Mesocyclops),底悽动物有跳虾(Gummarus),蜻蛉科(Libellulidae),扁蜉科(Ecdyuridae),浮蜉科(Ephemeridae)及摇蚊科(Chironomidae)幼虫,软体动物有田螺(Bellamya)及蚬(Corbicula)。黄河主要附属水体为一些大的由下陷地区所形成的不定型的洼地浅水湖泊,面织约20万市亩。由于引黄灌溉,这些湖泊一方面接受稻田所排之水,同时又以排沟泻入黄河,起蓄洪作用。湖泊的特点是水生植物从生,敞水区较小,硫化氢含量高,冬季覆冰期长,因覆冰而引起的冬季窒息现象年有发生,虽利于鱼类繁殖、肥育,但不利于鱼类越冬。 (二)本区土著鱼类有17种,分隶于14属、4科,2目。种类不多,区系成份简单,没有中亚高原复合体中的特有种,亦乏中国平原复合体的种类,产生这一情况的原因可能由于本区处于黄土高原的边缘,距中亚高原甚远,使这些鱼类达不到此地,而其下流则因为流经山陕高原,水势猛,流速犬,使平原地区的鱼类不能逆流而上达于此地。本区雅罗鱼及鲫无疑是属于北方平原复合体的种类;而鲤、泥鳅则属于古代上第三纪动物区系复合体的成份,显然在本区占有优势,永宁黑泉湖的鲫鱼因大(7市斤)而闻名。 (三)宁夏捕鱼工具有10多种,渔法有很多缺点,如炸鱼及叉鱼应当禁止,采用干湖捕鱼亦应当注意保护幼鱼。 (四)本区发展渔业与农田盐渍化亦须正确处理,目前有些人认为:为了避免农田盐渍化就必须排除湖泊,重点发展水稻栽培业,但从同一单位面积产值及营养价值来说,两者并重是一个理想的措施。但对于哪些浇水沼泽不适于鱼类越冬的湖泊应当排除,而用来作为发展渔业的湖泊需要筑堤设闸,控制水位,以防湖水溢出影响农田。 (五)结合本区水域特点,可以考虑散放麝鼠同时发展芦苇生产,这是因为芦苇本身不仅可以作为许多日常生活用具,还能起脱盐洗碱的作用,对改良本匹盐渍土壤有很重要意义。

1 . The background light influences phototaxis of Round scad on the horizontal gradient condition, The influence weakens with the increasing light intensity. This case in jnvenile is more intense than in adult.2 . The background light also influences phototaxis of Common Japanese mackeral on the horizontal gradient condition. The influence of oackground light weakens and phototaxis increases with the increasing light intensity.3 . The influence of background light of phototactic ratio on Common Japanese mackeral...

1 . The background light influences phototaxis of Round scad on the horizontal gradient condition, The influence weakens with the increasing light intensity. This case in jnvenile is more intense than in adult.2 . The background light also influences phototaxis of Common Japanese mackeral on the horizontal gradient condition. The influence of oackground light weakens and phototaxis increases with the increasing light intensity.3 . The influence of background light of phototactic ratio on Common Japanese mackeral is stronger than that on Round scad.4 . The increase of the intensity of artificial light source only raises to a certain extent the phototactic effect of both fishes.

1.背景光对兰圆鲹在水平光梯度内之趋光性有影响。随着光强的提高则影响有减弱趋势。此种现象幼鱼比成鱼表现强。 2.背景光对鲐鱼在水平光梯度内之趋光性也有影响,随着光强的增加,背景光的影响减弱,趋光性增强。 3.背景光对鲐鱼比对兰圆鲹趋光率的影响大。 4.无论兰圆鲹、鲐鱼,提高人工光源的强度,只在一定程度上提高其趋光效率。

 
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