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生态育苗池
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  ecological breeding ponds
     A Study on Copepods Community Structure in Ecological Breeding Ponds of Chinese Mitten Crab(Eriocheir sinensis) Larvae
     河蟹生态育苗池桡足类群落结构的研究
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  相似匹配句对
     Sea cucumber Ecological Breeding in an Earthen Pond
     海参土生态育苗技术
短句来源
     A Study on Copepods Community Structure in Ecological Breeding Ponds of Chinese Mitten Crab(Eriocheir sinensis) Larvae
     河蟹生态育苗桡足类群落结构的研究
短句来源
     The Study of Larval Breeding of Eriocheir sinensis by Ecological Way in Low Brackish Water Ponds
     土低盐度水体河蟹生态育苗试验
短句来源
     Study on Artificially Ecologic Breeding of Chinese Mitten CRAB in pond
     河蟹土生态育苗中敌害生物控制的实验室试验
短句来源
     New Technique for Seeding in Sea Cucumber,Apostichopus japonicu( Selenka)——Seeding in the Earthen Pond
     海参Apostichopus japonicus (Selenka)育苗新技术——土生态育苗
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This paper mainly deals with the relations among mysis、 Polydora ligni larva (PLL) copepod and zoea of chinese mitten crab (Eriocheir sinensis) during the crab larvae rearing period in ecological way.The results showed that the zoea survival and metamorphosis rates of the crab reduced significantly when the mysis was at density of 3 ind /L.Destruction to zoea caused by PLL increased along with the increase of density.PLL was seriously harmful to the metamorphosis of Z 1(metamorphosis rate is 40%,80%...

This paper mainly deals with the relations among mysis、 Polydora ligni larva (PLL) copepod and zoea of chinese mitten crab (Eriocheir sinensis) during the crab larvae rearing period in ecological way.The results showed that the zoea survival and metamorphosis rates of the crab reduced significantly when the mysis was at density of 3 ind /L.Destruction to zoea caused by PLL increased along with the increase of density.PLL was seriously harmful to the metamorphosis of Z 1(metamorphosis rate is 40%,80% in control group) The rate of Z ' 1s metamorphosis was about 30% without rotifers.Z 1 was able to eat the PLL whose length is less than 0 4mm Z 5 can eat any sizes of PLL instead of being eaten by PLL So we can handle and take advantage of PLL under certain conditions.The copepod mainly interferes in the metamorphosis of zoea and causes crab larvae death.The metamorphosis rate of Z 1 was only 25% when the density of copepod was upwards to 500 ind /L.Because the copepod was the natural food of Z 4 and Z 5,we should control its density(<100 ind /L)during rearing incipiency (Z 1~Z 2)

研究了河蟹生态育苗池中最常见的糠虾、利氏才女虫幼体 (PLL)、桡足类与河蟹状幼体 (Z)间的关系。结果表明 :糠虾严重影响Z的存活与变态 ,其密度达 3个 /L时可使育苗绝产 ,应彻底杀灭。PLL对Z的危害随其密度的增大而加剧 ,当PLL达 5 0 0个 /L时即严重危害Z1的变态 (变态率为 40 % ,对照组为 80 % ) ;在无轮虫的情况下Z1的变态率更低 (30 % )。Z1可摄食体长小于 0 4mm的PLL ,Z5则完全可以PLL为食而不受其害 ,因此 ,可根据具体条件控制利用PLL。桡足类对Z的影响主要是干扰变态 ,以至引起死亡。当桡足类密度达 5 0 0个 /L时 ,Z1的变态率仅为 2 5 % ,因桡足类是Z4 、Z5的饵料生物 ,育苗初期 (Z1~Z2 )要控制其密度 (<1 0 0个 /L)

This paper deals with effects of pH on the metamorphosis of Eriocheir sinensis larva (zoea,Z) and attenuation of effective chlorine and the daily change in pH. It was found that metamorphosis of Z2 was possible at pH 5.5~9.6, optimal at pH 7.0~9.1. Effective chlorine of 18 mg/L completely attenuated 29 hours after applying bleaching powder to pond water in which pH rose first, reaching the peak 9.20, and then dropped to the original value 5 days after application. Dipterex became detoxic at 1.0 mg/L 3 days...

This paper deals with effects of pH on the metamorphosis of Eriocheir sinensis larva (zoea,Z) and attenuation of effective chlorine and the daily change in pH. It was found that metamorphosis of Z2 was possible at pH 5.5~9.6, optimal at pH 7.0~9.1. Effective chlorine of 18 mg/L completely attenuated 29 hours after applying bleaching powder to pond water in which pH rose first, reaching the peak 9.20, and then dropped to the original value 5 days after application. Dipterex became detoxic at 1.0 mg/L 3 days after application, indicating it should be used to control Calenside at least 3 days early. The pH adaptive trial of polychaeta and the acute toxic trial at different pH values, at (16±2)℃ and a salinity of 28 showed that polychaeta could endure pH 10.0. At pH 8.5, 9.0, 9.5, and 10.0, the 24 h LC50 for Polychaeta was 31.77, 11.26, 3.18, 0.32 mg/L, respectively. 

研究了pH对中华绒螯蟹Eriocheirsinensis溞状幼体Ⅱ期(Z2)变态的影响,即pH为5 5~9 6时Z2期幼体可变态,最适pH为7 0~9 1。监测了施用漂白粉后池水中有效氯的衰减及pH日变化情况,结果表明,18mg/L的有效氯29h基本衰减完毕;施用漂白粉后,池水pH先升高,最高达9 20,5d后接近原海水的pH值。室外土池泼洒1 0mg/L的敌百虫,失效时间为3d。在温度(16±2)℃、盐度28的条件下,对利氏才女虫Polydoraligni进行了pH适应性试验和不同pH下总氨氮的急性毒性试验,结果表明:利氏才女虫在pH为10 0时,24h内虽可存活,但已产生不良影响;在pH为8 5、9 0、9 5、10 0时,总氨氮对多毛类的24LC50分别为31 77、11 26、3 18、0 32mg/L。并根据试验结果,总结出一套适合于河蟹生态育苗池和轮虫培养池生态调控水质的方法。

This study was conducted to investigate the species composition, density,biomass,temporal and spatial distribution,and diel vertical migration of copepods in ecological breeding ponds,located at Liaohe Delta district to cultivate Eriocheir sinensis larvae.The result indicates that there are 7 copepods species: Eurytemor affinis,Sinocalnus tenllus,Calanus sinicus,Schmackeria inopinus,Halicyclops sp.,Schizopera sp.and Acartiella sp.,of which E.affinis and S.tenllus are dominant species in the ponds,and their mean...

This study was conducted to investigate the species composition, density,biomass,temporal and spatial distribution,and diel vertical migration of copepods in ecological breeding ponds,located at Liaohe Delta district to cultivate Eriocheir sinensis larvae.The result indicates that there are 7 copepods species: Eurytemor affinis,Sinocalnus tenllus,Calanus sinicus,Schmackeria inopinus,Halicyclops sp.,Schizopera sp.and Acartiella sp.,of which E.affinis and S.tenllus are dominant species in the ponds,and their mean density is 233?ind/L and 92.3?ind/L respectively.Moreover,the density of copepods in the ponds ranges from 20 to 1540?ind/L.During the breeding stage,the copepods density in downwind zone is significantly higher(P<0.01) than that in upwind zone,but during the pro-stage,it is similar in both zones.And in pro-stage,the vertical distribution rhythm of copepods is unconspicuous,while in breeding stage,the copepods density in bottom zone is higher(P<0.05) than that in surface zone.For diel vertical migration of copepods it is relatively uniform in both zones at night,but by daylight the copepods density in surface zone is higher than that in bottom zone.The data demonstrates that the temporal and spatial distribution characteristic of copepods is closely related with that of Eriocheir sinensis larvae in the ponds.

报道了辽河三角洲河蟹(Eriocheir sinensis)生态育苗池中桡足类的种类组成、密度、生物量、时空分布和昼夜垂直移动。结果表明,育苗池中有近亲真宽水蚤(Eurytemor affinis),细巧华哲水蚤(Sinocalnus tenllus),中华哲水蚤(Calanus sinicus),指状许水蚤(Schmackeria inopinus),咸水剑水蚤(Halicyclopssp.),裂囊猛水蚤(Schizoperasp.),异水蚤(Acartiellasp.)等7种桡足类。其中,近亲真宽水蚤和细巧华哲水蚤为优势种,平均密度分别为233ind/L和92.3 ind/L,桡足类的密度变幅为20~1540 ind/L。桡足类的水平分布在育苗前期上、下风位比较均匀,但育苗期下风位>上风位,差异极显著(P<0.01);桡足类的垂直分布育苗前期规律不明显,育苗期底层>表层,差异显著(P<0.05);桡足类的昼夜垂直移动变化为白天表层>底层,晚上分布比较均匀;桡足类的空间分布特点与河蟹幼体在池塘中的空间分布特点密切相关。

 
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