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post larvae
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  仔虾
     The post larvae growth and survival rates of Penaeus peni-cillatus reached the best-level when the concentration of Mg2 + was 877. 8mg/1, the concentration of Ca2 + was 278.7 - 292. 6mg/1 and the ratio between Mg2+ and Ca2 + was 3.00 - 3.15/1.
     当水体中Mg~(2+)质量浓度为877.8mg/l,Ca~(2+)含量为278.7-292.6mg/l,并且Mg~(2+)/Ca~(2+)=3.00-3.15/1时长毛对虾仔虾生长发育最佳。
短句来源
     The optimal nutried requirements of Penaeus penicillatus post larvae for C16:n、C18:n、C18:2n、C18:3n、C20:1-5n、C22:24 are 0.24%、1.40%、1.85%、0.43% 、0. 76%、 2. 25%respectively.
     在本实验条件下,长毛对虾仔虾期对C16:n、C18:n、C18:2u、C18:3n、C20:1-5n和C22-24的最适宜含量分别占饲料的0.24%、1.40%、1.85%.0.43%、0.76%和2.25%。
短句来源
     the 24 h,48 h,72 h,96 h half lethal concentrations of the nitrite nitrogen to Procambarus Clarkii post larvae was 28.69 mg/L,22.69 mg/L,18.92 mg/L,15.19 mg/L respectively; the safe concentration was 1.52 mg/L.
     亚硝酸盐氮对克氏原螯虾仔虾24 h4、8 h、72 h、96 h半致死浓度分别为28.69 mg/L、22.69 mg/L1、8.92 mg/L、15.19 mg/L,安全浓度为1.52 mg/L。
短句来源
     Influences of Ca + and Mg2+ on the ratio of growth and survival in post larvae of Penaeus penicillatus Alcock were studied. The results showed that the concentration of Ca2+ , Mg2+ and the ratio between Ca2+ and Mg2+ in the salting water were the important factors to interfere in the rates of growth and survival in post larvae of Penaeus penicillatus.
     研究了Ca~(2+)和Mg~(2+)对长毛对虾仔虾生长和成活率的影响,实验结果表明:盐场水库水体中Ca~(2+)和Mg~(2+)质量浓度及它们之间的比例是影响长毛对虾(Penaeus penicillatus Alcock)仔虾生长和成活率的重要因素;
短句来源
     Results show that the relationship between dry weight and length of Penaeus japonicus post larvae assumes index function, DW =0.006e 0.515 L ( r 2=0.999, n =16);
     结果表明 ,日本对虾仔虾体长与干体重呈指数函数关系 ,DW =0 .0 0 6e0 .5 15L(r2 =0 .999,n =1 6 ) ;
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  “post larvae”译为未确定词的双语例句
     By applying technical measures of temporary rearing of post larvae, water temperature control, mechanic aeration, rational feeding and disease prevention and treatment, a total yield of 2352 kg of P. vannamei with an average body length of 12.6 cm was produced from the shrimp ponds of 1 hm 2 totel area after 100 days of rearing.
     采取虾苗暂养、控制水温、机械增氧、科学投饵及病害防治等措施,在总面积1hm2的虾池中,经100d饲养,共产南美白对虾2352kg,平均体长12.6cm。
短句来源
     The result showed that the chitosan can purify water with the concentration of 50 - 100×10- 6. So we can rear larvae of Macrobrichium rosenbergii with no change water, it can control the reproduction of bacteria, strengthen the immune ability of the post larvae and increase the survival rate of them when 25 - 100×10-6 chitosan was added to the rearing water, and it can promote growth with the concentration of 25 - 50×10-6.
     (2)在水体中加入壳多糖(25—100×10~(-6))可以抑制气单胞菌的生长繁殖,增强罗氏沼虾的免疫功能,提高虾苗的成活率; (3)25—50×10~(-6)壳多糖可促进虾苗的生长。
短句来源
     Among the 90 artificially-caltured parent fish at 2+ years old,only part of them matured in sexual gland,but neither spawning nor sperming. Totally 1 990 000 larvae were cultured in the 12 culture ponds at water temperature(23±2) ℃,and 615 000 of post larvae(total length 30-50 mm) were obtained after 70 d and the survival rate was 30.9%,averaging 2 050 ind/m3.
     12个鱼苗培育池先后放入人工初孵仔鱼199万尾,在(23±2)℃水温条件下,经过70 d的培育,共培育出全长30~50 mm的商品苗种61.5万尾,成活率30.9%,平均出苗量2050尾/m3,实现了半滑舌鳎的工厂化人工苗种繁育。
短句来源
     The result shows that, first, chitosan with a density of 50 ×60-6 has an effect of purifying water and preventing it from deterioration, thus makes it possible to cultivate the post larvae of Macrobrichium rosenbergii and Penaeus monodo without changing water;
     结果表明:(1)在培养水体中加入壳多糖(50×10-6)能净化水质,防止水质恶化,因而可进行不换水育苗;
短句来源
     The results are as follows:3 544 000 post larvae at body length of were got in 10 cm the outdoor ponds. The total survival rate was 591% outdoors.
     室外育苗池共放入南美白对虾无节幼体600万尾,培育至体长1 0cm的虾苗,出苗354 4万尾,总成活率为59 1%。
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  相似匹配句对
     On Post Training
     浅谈岗位职务培训
短句来源
     Primary studies on respiration and excretion of Penaeus japonicus post-larvae
     日本对虾仔虾呼吸和排泄的初步研究
短句来源
     Post-ALL
     后一切
短句来源
     The short-period culturing experiment for post larvae of Macrobrachium rosenbergii
     晚期罗氏沼虾苗短周期养殖试验
短句来源
     By larvae, the change is indistinctive.
     对幼虫钻蛀取食的反应是不显著的;
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  post larvae
In order to point out the potential importance of the Kuroshio front as a feeding ground for the early post larvae of the Japanese sardine, distributions of copepod nauplii-the principal food for the larvae-were investigated.
      
The post larvae ofMetapenaeus affinis are found in the inshore plankton from November to June with the peak in March.
      
Brachyuran zoeae, post larvae of prawns and barnacle nauplii occur in the plankton throughout the year with distinct peaks for different groups.
      
Trypsin, amylase, pepsin, alkaline phosphatase and leucine-alanine peptidase activities (specific activity: U?mg protein-1; segmental activity: U?larva-1) were measured in the post larvae digestive tract.
      
Post larvae were fed twice a day and the amount of food supplied was determined based on the predicted maximum growth attainable.
      
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1. In the spawning season of penaeid shrimp the bottom water temperature in the Bo-Hai Bay was found to range from 13 to 23℃ and in full swing of spawning season from 13 to 18℃. The lowest water temperature in the spawning ground for penaeid shrimp to spawn was 13℃.The salinities in the spawning ground varied widely in the range and from year to year and the range of fluctuation was 23.0 to 30.3‰. 2. The time of the beginning of the spawning period in each year varied with water temperature. In the spawning...

1. In the spawning season of penaeid shrimp the bottom water temperature in the Bo-Hai Bay was found to range from 13 to 23℃ and in full swing of spawning season from 13 to 18℃. The lowest water temperature in the spawning ground for penaeid shrimp to spawn was 13℃.The salinities in the spawning ground varied widely in the range and from year to year and the range of fluctuation was 23.0 to 30.3‰. 2. The time of the beginning of the spawning period in each year varied with water temperature. In the spawning ground in the Bo-Hai Bay, the earliest spawning date recorded was on 2 May in the years 1967, 1973 and 1978 and the latest date was on 18 May, 1969. The whole spawning season prolonged a rather long time, nearly one month. 3. Eggs and larvae of penaeid shrimp were not uniform in their distribution in sea water. Eggs tended to sink but they were suspended in the moving sea water. There were apparently more eggs in the bottom than in the surface layer, more nauplii and zoea in the surface layer than in the bottom, and more mysis, especially post larvae, in the bottom than in the surface layer. 4. Spawning of penaeid shrimp took place in the vicinity of estuaries, but only when the salinity of the sea water became higher could the eggs hatch and metamorphosis. The lowest salinity at which zoea and mysis have been found was 17.9‰. Post larvae displayed an anadromous behaviour and might migrate up rivers and reach the areas more than 50 km away from estuaries. The lowest salinity at which the post larvae have been found was 0.86‰. 5. The studies on the habits of post larvae and juvenile shrimp will provide a biological basis which is of considerable importance in establishing the fishery management regulations, including closed area and closed season for various fishing gears, in order to conserve penaeid shrimp resources.

1.对虾产卵期间底层水温为13—23℃,产卵盛期水温为13—18℃,13℃是渤海湾产卵场对虾产卵的最低水温;产卵场盐度的变动范围和年度之间的差异较大,波动范围为23—30.30‰。 2.对虾各年开始产卵的时间因水温不同而异,渤海湾产卵场开始产卵的时间最早为5月2日(1967、1973、1978年),最迟为5月18日(1969年)。整个产卵期持续时间较长约一个月左右。 3.对虾卵子幼体在水中并不是均匀地分布的。卵子为沉性,但却悬浮在运动的海水中,底层显著的多于表层;无节、溞状幼体的数量表层多于底层;糠虾幼体特别是仔虾的数量底层多于表层。 4.对虾选择河口附近海区产卵,但卵子一定要在盐度较高的海水中孵化变态,所见淹状、糠虾幼体分布的最低盐度为17.90‰;仔虾有溯河习性,可以上溯到离河口60余公里的地方,所见仔虾的最低盐度为0.86‰。 5.对仔虾和幼虾生活习性的研究,为制定保护对虾资源的各类网具的禁渔区和禁渔期提供了生物学依据。

The development of the larva of Penaeus penicillatus resembles that of P. japonicus and P. orientals. They have to pass through the same number of larval substage. The difference between P. penicillatus from P. Japonicus and P. P.orienalf are as follows:1. The caudal sqine formula of nauqllus larva! stages: 2. The segmentation of exopodile the second antenna 3. The firs threet pairs of the 1st mysis stage in P. prnicillatus are cheate, this is similar to...

The development of the larva of Penaeus penicillatus resembles that of P. japonicus and P. orientals. They have to pass through the same number of larval substage. The difference between P. penicillatus from P. Japonicus and P. P.orienalf are as follows:1. The caudal sqine formula of nauqllus larva! stages: 2. The segmentation of exopodile the second antenna 3. The firs threet pairs of the 1st mysis stage in P. prnicillatus are cheate, this is similar to the P. japonicus, while those of P. orientalis begin to appear only in the second stage.4. There are 3 clusters of setae on the scaphocerite of the second antenna in the first post-larva of P, penicillatus being similar to those of P. japonicus, while the P. orientalis has none.

本文对长毛对虾胚后各发育期的形态特征作了较详细的描述,并与东方对虾和日本对虾进行了比较,为对虾人工育苗提供科学资料。

At present, earthen ponds for penaeid shrimp culture previal in China, in which the main devices for changing water depend on tide cycle with sluice gate. When the pond is in intensive stocking and a large-quantities of food in feeding, there will be a deposit of large amount of organic materials on the bed of the pond, and toxic hydrogen sulfide often produces as a result of anaerobic decomposition from those matters, and it usually causes hazardous mortality to the shrimp during the changing season from summer...

At present, earthen ponds for penaeid shrimp culture previal in China, in which the main devices for changing water depend on tide cycle with sluice gate. When the pond is in intensive stocking and a large-quantities of food in feeding, there will be a deposit of large amount of organic materials on the bed of the pond, and toxic hydrogen sulfide often produces as a result of anaerobic decomposition from those matters, and it usually causes hazardous mortality to the shrimp during the changing season from summer to autumn. From the view point of ecosystem-balance and the physiological characteristics of Order Decapoda, scientific researches on elimination and prevention of toxic hydrogen sulfide occurring in the pond of penaeid shrimp culture were carried out in field situations in 1972-1976 and under laboratory conditions in 1979-1981. The preliminary results of the research are as follows: 1. According to the mechanism of combination of cupric (Cu~(++)) and sulfide (S~=) ions to form stable precipated non-toxic cupric sulfide (CuS↑) and on account of the physiological characteristics of containing hemocyanins in Decapoda, researches on the use of cupric sulfate crystal (Cu SO_4·5 H_2O) as a restrainer and elimination agent of toxic hydrogen sulfide in penaeid shrimp culture pond have been made. 2. The experiments have affirmed that when toxic hydrogen sulfide occurs in case of emergency, contents of sulfide in the pond are determined at first, and then use an amount of cupric sulfate, 2.5-4.0times the total amount of sulfide in the water and making it to contain 0.5% solution for sprinkling on the pond, It is preferable to scatter some fine soil over the pond at the same time. The toxicity of hydrogen sulfide can then be eliminated or minimized immediately. Results of the tests of varied concentrations of sulfide for young Palaemon sp. (body length 2-3 cm) and post-larvae of Penaeus orientalis (body length 0.7 cm) show that (Tables 5-6), groups of both species which have been applied with proper quantity of cupric sulfate have shown a higher survival rate, from 80-100%, while the controls of Penaeus orientals post-larvae even have shown a 100% mortality in a short time from 2 to 26 minutes. 3. The results of varied species of organisms in tests by appling cupric sulfate have shown that, cupric sulfate has no effect on non-hemocyanins zoo-plankton such as Calanus pacificus Brodsky and Sagitta crassa Tokioka.

根据1972—1976年用以铜为主的化学元素、发酵配合饵料在土池进行对虾养殖的生产实践和1979—1981年在室内用硫酸铜消除硫化氢危害有关生物的实验结果,初步明确了用硫酸铜能抑制和消除硫化氢危害对虾养殖的机理和确定了应用上量问(CuSO_4·5H_2O/s~=)关系的依据,结论如下: 1.根据正二价铜离子(Ca~(++))和负二价硫离子(S~=)反应化合,生成可沉淀无毒硫化铜(CuS↓)的机理以及甲壳类十足目含血蓝蛋白的生理特点,创立用硫酸铜作为对虾养殖池发生硫化氢的抑制剂和消除剂。 2.经实验确定,当养殖池出现硫化氢的紧急危害时,可用硫化物测定法,检测现场池子的硫化物含量或浓度,并根据水体大小,用2.5—4倍于硫化物含量的硫酸铜,配成0.5%的溶液,均匀喷洒于池中,并根据土壤有吸附硫化氢的作用,同时撒扬些细土,顷刻即能减弱或消除养殖池硫化氢的毒害作用。如幼长臂虾(体长2—3厘米)和对虾仔虾(体长0.7厘米左右)经不同含量硫化物的水样多次实验,其结果如表5—6所示。用适宜量硫酸铜组,均能获得80—100%较高的成活率,而不用硫酸铜的仔对虾对照组,甚至均无例外地在2—26分钟短时间内全部死亡。 3.通过不同种...

根据1972—1976年用以铜为主的化学元素、发酵配合饵料在土池进行对虾养殖的生产实践和1979—1981年在室内用硫酸铜消除硫化氢危害有关生物的实验结果,初步明确了用硫酸铜能抑制和消除硫化氢危害对虾养殖的机理和确定了应用上量问(CuSO_4·5H_2O/s~=)关系的依据,结论如下: 1.根据正二价铜离子(Ca~(++))和负二价硫离子(S~=)反应化合,生成可沉淀无毒硫化铜(CuS↓)的机理以及甲壳类十足目含血蓝蛋白的生理特点,创立用硫酸铜作为对虾养殖池发生硫化氢的抑制剂和消除剂。 2.经实验确定,当养殖池出现硫化氢的紧急危害时,可用硫化物测定法,检测现场池子的硫化物含量或浓度,并根据水体大小,用2.5—4倍于硫化物含量的硫酸铜,配成0.5%的溶液,均匀喷洒于池中,并根据土壤有吸附硫化氢的作用,同时撒扬些细土,顷刻即能减弱或消除养殖池硫化氢的毒害作用。如幼长臂虾(体长2—3厘米)和对虾仔虾(体长0.7厘米左右)经不同含量硫化物的水样多次实验,其结果如表5—6所示。用适宜量硫酸铜组,均能获得80—100%较高的成活率,而不用硫酸铜的仔对虾对照组,甚至均无例外地在2—26分钟短时间内全部死亡。 3.通过不同种类生物的对比实验结果表明,用硫酸铜消除硫化氢的危害,对诸如太平洋哲镖溞(Calanus pacificus Brodsky)和强壮箭虫(Sagitta crassa Tokioka)等非含血蓝蛋白的浮游动物,无效果。

 
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