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   幼虫生长 在 水产和渔业 分类中 的翻译结果: 查询用时:1.632秒
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幼虫生长    
相关语句
  larval growth
    EFFECT OF USING RHODOPSEUDOMON AS SP. AS FEED ADDITIVE ON LARVAL GROWTH AND DEVELOPMENT OF CHLAMYS FARRERI
    紫色无硫细菌对栉孔扇贝幼虫生长发育的影响
短句来源
    Larval growth decreased significantly with increasing larval density.
    幼虫培育密度对幼虫生长有显著影响,但对浮游期存活率影响不显著。
短句来源
    Negative effect of selection appeared on larval growth of BS 2,it was originally from crossing between two different populations. No differences on larval growths displaied respectively between another crossing lines, BD 2and DS 2,and unselected control line.
    选择对种群间杂交系列 (BD2 、BS2 和DS2 )的影响分为两种情况 :对BS2 幼虫的生长有负作用 ,而对BD2 和DS2 幼虫生长无影响 ,与SC1幼虫的生长速度比较无显著性差异。
短句来源
  larval growth
    EFFECT OF USING RHODOPSEUDOMON AS SP. AS FEED ADDITIVE ON LARVAL GROWTH AND DEVELOPMENT OF CHLAMYS FARRERI
    紫色无硫细菌对栉孔扇贝幼虫生长发育的影响
短句来源
    Larval growth decreased significantly with increasing larval density.
    幼虫培育密度对幼虫生长有显著影响,但对浮游期存活率影响不显著。
短句来源
    Negative effect of selection appeared on larval growth of BS 2,it was originally from crossing between two different populations. No differences on larval growths displaied respectively between another crossing lines, BD 2and DS 2,and unselected control line.
    选择对种群间杂交系列 (BD2 、BS2 和DS2 )的影响分为两种情况 :对BS2 幼虫的生长有负作用 ,而对BD2 和DS2 幼虫生长无影响 ,与SC1幼虫的生长速度比较无显著性差异。
短句来源
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  larval growth
Considerable differences were found in salinity tolerance of adult periwinkles, larval growth and survival, and morphology of the egg capsules.
      
A temperature of 20°C promoted an enhanced larval growth and development.
      
Though a temperature of 20°C caused enhanced larval growth, the temperature was not optimal, while its effect caused quality diversity of larval development, owing to the difference in their growth rates.
      
In turn, anomalies of the mouthparts have an effect on the rate of larval growth and development and on the survival of tadpoles in the period of the metamorphic climax.
      
None antiparasitic effect of ABCD on larval growth was determined.
      
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  larval growth
Considerable differences were found in salinity tolerance of adult periwinkles, larval growth and survival, and morphology of the egg capsules.
      
A temperature of 20°C promoted an enhanced larval growth and development.
      
Though a temperature of 20°C caused enhanced larval growth, the temperature was not optimal, while its effect caused quality diversity of larval development, owing to the difference in their growth rates.
      
In turn, anomalies of the mouthparts have an effect on the rate of larval growth and development and on the survival of tadpoles in the period of the metamorphic climax.
      
None antiparasitic effect of ABCD on larval growth was determined.
      
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  其他


For the purpose to select suitable food for cultivation of the larvan of Ruditapesphilippinarum,a series of comparative experiments had been carried out. Several speci-es of unicellullar algae were selected for test, and the results obtained were as follows: 1. Food should be given at the stage of veliger. At this stage, the larvae showed apreferable selection for the size and activity of the feeding algae. If the small-sizedand highly multiplicative unicellullar algae could be provided in time, the period ofcultivation...

For the purpose to select suitable food for cultivation of the larvan of Ruditapesphilippinarum,a series of comparative experiments had been carried out. Several speci-es of unicellullar algae were selected for test, and the results obtained were as follows: 1. Food should be given at the stage of veliger. At this stage, the larvae showed apreferable selection for the size and activity of the feeding algae. If the small-sizedand highly multiplicative unicellullar algae could be provided in time, the period ofcultivation of the larvae might be shortened. 2. Six species of unicellullar algae were used in the tests. The result showed thatDicrateria zhanjiangensis, Cheatoceros sp., Cheatoceros simplex and Phaeodactylumtricornutum were found to be better. Survival rate could reach to 36-50%. When fedwith Heterogloea sp. growth apeed and survival rate of the developing larva were verylow. The big size and the strong activity of Platymonas sp. could hardly be graspedby the larvae. 3. If the larvae were fed with mixed food of Dicrateria zhanjiangensis andCheatoceros sp., or Dicrateria zhanjiangensis and Phaeodactylum tricornutum, the deve-lopment of the larvae and the survival rate raised to 70-71%. 4. The feeding quantity is also important in the cultivation of the larvae. Experi-ments showed that at begining the quantity should be controlled at 15000 ind./ml. perday, two days later it should be gradually raised to 40000-50000 ind./ml. per day. 5. By feeding with senescent algae, there was evident effect on the growth andmetamorphosis of the larvae. Aged Cheatoceros sp. gave no evident effect, but agedDicrateria zhanjiangensis had evident effect on the larvae and varying with the degreeof senescense.

本文叙述了菲律宾蛤仔面盘幼虫初期对饵料大小和活动能力有明显选择性。培养时,能及时投放个体小、幼虫生长快的单胞藻为饵料,可缩短幼虫培养周期和使幼虫变态更一致。试验表明,湛江叉鞭金藻、角走藻和三角褐指藻是幼虫较理想的饵料。幼虫摄食上述饵料,变态成稚贝的存活率可达36-50%。如投放湛江叉鞭金藻和角毛藻,或湛江叉鞭金藻和三角褐指藻混合的饵料,能使幼虫生长快,变态成稚贝的存活率分别提高到70%和71%。投放上述单一或混合饵料时,培养初期饵料密度应控制在每天1.5万个/毫升,培养二天后,密度逐渐增至每天4-5万个/毫升。 文中还论述了“老化”的湛江叉鞭金藻和10—20%“老化”的角毛藻液对蛤仔幼虫生长变态有影响。培养蛤仔幼虫时,应选择“指数生长期”的藻类为饵料。

The larvae of green mussel Mytilus viridis was able to ingest micro-organismsfrom sea water after 48 hours from fertilization. The larvae might survive and keepswimming for several days even lack of food. The experiment shows that the growth and the survival rates of the larvae havedistinctions by feeding on different foods. The young larvae of green mussel were unable to digest Chlorella sp. and they diedat 6-7 days after fertilization. Platymonas sp. is rather large in sise, young larvae also could not ingest...

The larvae of green mussel Mytilus viridis was able to ingest micro-organismsfrom sea water after 48 hours from fertilization. The larvae might survive and keepswimming for several days even lack of food. The experiment shows that the growth and the survival rates of the larvae havedistinctions by feeding on different foods. The young larvae of green mussel were unable to digest Chlorella sp. and they diedat 6-7 days after fertilization. Platymonas sp. is rather large in sise, young larvae also could not ingest it andalways cause mortality. The larvae of straight-hinged stage can ingest and utilize marine yeast. The larvae grew rapidly and the survival rate is very high. The concentration of yeast is0.9-1.7mg/L. When the larvae developed to early stage of umbo, the yeast alone it was insuffici-ent to meet the nutritional requirement for growth and development, and they canutilize Platymonas sp. as food. The most effective way is to feed them with mixture ofPlatymonas sp. and yeast.

本文介绍了翡翠贻贝幼虫饲料的研究成果。 翡翠贻贝的受精卵在水温27.7—29.3℃,48 小时就发育成早期直线绞合期幼虫,开始具有摄食食物的能力。此时以球藻为饲料的幼虫,其生长速度与不投饲料的相似,而活动能力反比不投饲料的差,至第7天就全部死亡;以扁藻为饲料的幼虫其早期生长也同不投饲的近似;似酵母的饲料的幼虫生长快,存活率高。但当发现到了壳顶幼虫期,以酵母为饲料的,生长发育慢,活动能力弱,死亡率高;以扁藻为饲料的生长发育快,但死亡率较高。对于壳顶期幼虫如果饲以酵母和扁藻的混合饲料,则生长速度同单独饲以扁藻的接近,但明显地能提高幼虫的活动能力和存活率。

Single and combined effects of temperature and salinity on the growth and development of the larvae of Sinonovacula constricta (Lamarck) hava been studied in the laboratory. The results obtained show that the temperature range from 17℃ to 32℃ is suitable for growth and development of larvae and 25℃ to 27℃ is the optimum temperature. The larvae show strong tolerance to hign and low temperatures. The lethal critical temperature is about 40℃. The lower critical temperature for metamorphosis is about 15℃. The suitable...

Single and combined effects of temperature and salinity on the growth and development of the larvae of Sinonovacula constricta (Lamarck) hava been studied in the laboratory. The results obtained show that the temperature range from 17℃ to 32℃ is suitable for growth and development of larvae and 25℃ to 27℃ is the optimum temperature. The larvae show strong tolerance to hign and low temperatures. The lethal critical temperature is about 40℃. The lower critical temperature for metamorphosis is about 15℃. The suitable salinity for growth and development of larvae is in the range of 4.5% to 28.30%, and 12,40% is the optimum. The larvae show stronger tolerance to low salinity than to high salinity.The effects of temperature on the duration of larvae: stage the increasing of body weight per day and survival rate of larvae are more evident than that of salinity, yet, the effects of salinity on the rate of holometamorphosis are more important than that of temperature. The interaction of temperature and salinity on the growth and development of larvae is not obrious.

本文叙述了在室内控制条件下,温度和盐度单因子及其结合对缢蛏浮游幼虫的影响。缢蛏浮游幼虫生长发育的适温范围为17°—32℃,其中以25°—27℃为最好。对高温和低温有较强的耐力,致死温度的上限为40℃左右,变态的下限水温为15℃左右,幼虫适盐范围是4.50—28.30‰,其中以12.40‰为最适宜,但幼虫对低盐度的耐力比对较高盐度的耐力强。 温度对缢蛏浮游幼虫期的长短、增长速度和存活率的影响,要比盐度对它的影响显著,而盐度对缢蛏幼虫变态率的影响却比温度重要些。温度与盐度对缢蛏浮游幼虫发育影响的相关性不明显。

 
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