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   仔幼鱼 在 水产和渔业 分类中 的翻译结果: 查询用时:2.319秒
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仔幼鱼    
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  larval and young fish
    The above results show that it is reasonable to discriminate larval and young fish with its otolith by Fourier shape analysis, especially based on body length.
    上述研究结果表明,采用基于耳石形态的傅立叶分析方法来鉴别仔幼鱼的种类是可行的,以体长为基础的判别方程具有最好的判别效果。
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  larval and juvenile
    This paper described the morphological characters of Chinese sucker ( Myxocyprinus asiaticus ) larval and juvenile and their main living habits. Besides, different methods for rearing fry and fingerlings were explored, the rearing survival rate was 55.2%~97.4%.
    对胭脂鱼仔幼鱼发育的形态特征及其主要生活习性进行了描述,探讨了胭脂鱼苗种的不同培育方法,其培育成活率为55.2%~97.4%;
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  larvae and juvenile
Original illustrations of larvae and juvenile are provided.
      
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.
      
In the summer of 2000, of the 80 taxonomic forms found on the polygone, 48 were represented only by larval stages of development; 27, only by juvenile and adult specimens; and 5, by both larvae and juvenile and adult specimens.
      
Development study on some digestive enzymes of Takifugu rubripes larvae and juvenile
      
The activities of some digestive enzymes are studied for Takifugu rubripes larvae and juvenile from the first feeding to 27d after hatching at selected stages of development.
      
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  larval and juvenile
Larval and juvenile growth rates are within the range of growth rates of other populations.
      
BROOD SIZE DOES NOT INFLUENCE THE BEHAVIOUR OR DENSITY OF LARVAL AND JUVENILE SMALLMOUTH BASS UNDER PARENTAL CARE
      
Comparison of the larval and juvenile morphology within the family Pylochelidae revealed that the widely distributed species P.
      
The larval and juvenile teeth are changed from conical to adult molariform teeth through seven stages.
      
Methoxychlor concentrations of 0.05 and 4.0 μg/l delayed motting of larval and juvenile crabs, respectively, and this delay was as much as 10 days for the juveniles.
      
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  larvae and juvenile
Original illustrations of larvae and juvenile are provided.
      
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.
      
In the summer of 2000, of the 80 taxonomic forms found on the polygone, 48 were represented only by larval stages of development; 27, only by juvenile and adult specimens; and 5, by both larvae and juvenile and adult specimens.
      
Development study on some digestive enzymes of Takifugu rubripes larvae and juvenile
      
The activities of some digestive enzymes are studied for Takifugu rubripes larvae and juvenile from the first feeding to 27d after hatching at selected stages of development.
      
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  其他


This paper deals with the feeding habit of different developmental stages from fryto juvenile of T. nilotica. The morphological characteristics of the teeth on both theupper and lower jaws and of pharyngeal teeth, gill rakes, gut and digestive glands areobserved systematically. The morpholigical changes of the digesitive organs in regardto the variation of the feeding habit is examined, and also the feeding habit of T.nilotica during each development stage and guts contents have been analysed.

本文研究了尼罗罗非鱼仔幼鱼消化器官的形态特征及其对食性变化的形态适应;系统地观察了尼罗罗非鱼各发育阶段的食性。

The scale formation of common carp, grass carp, silver carp, bighead carp andtilapia were studied by using the alizarin red method. The first appearanee of scales ata total length of 16-19 mm, 17-19 mm, 27--32 mm, 26--31 mm and 10-13 mm respe-ctively for the 5 species of fish and the formation completed at 24--30 mm, 24--28 mm,47--55 mm, 48--55 mm and 19--21 mm total length respectively.Scales first appeared along the lateral line in all species which could be separatedinto categories according to the region...

The scale formation of common carp, grass carp, silver carp, bighead carp andtilapia were studied by using the alizarin red method. The first appearanee of scales ata total length of 16-19 mm, 17-19 mm, 27--32 mm, 26--31 mm and 10-13 mm respe-ctively for the 5 species of fish and the formation completed at 24--30 mm, 24--28 mm,47--55 mm, 48--55 mm and 19--21 mm total length respectively.Scales first appeared along the lateral line in all species which could be separatedinto categories according to the region of first scale appearance and the pattern of scaledevelopment. In commom carp, grass carp, silver carp and bigheadcarp, scales firstappeared behind the operculum, and development took place from anterior to posterior.In tilapia, scales first appeared on the caudal peduncle and developed anteriorly. Thecarps could be further subdivided, based on the detailed pattern of scale development,common and grass carp in one group, and silver and bighead carp in another.Regression of scale formation parameters upon fish length and age showed that theinitiation and termination of scale formation as well as certain developmental patternswere closely related to body length, but insignificantly to age.The pattern of scale development not only reflects that growth law which is appli-cable to each species,but also reflects the evolutionary relationships among fish species.

用茜素红染色法观察研究了904尾鲤鱼、429尾草鱼、637尾鲢鱼、70尾鳙鱼及243尾尼罗罗非鱼的仔幼鱼。五种鱼鳞片出现时全长分别为:16—19,17—19,27—32,26—31,10—14mm。完成鳞被复盖时的全长分别为 24—30,24—28,47—55,48—58,19—22 mm。五种鱼鳞片出现均始于侧线,但出现部位和复盖过程可分为两类:鲤、草鱼、鲢及鳙的鳞片首先出现于躯干前部,为由前向后发展型,至于具体扩展过程,鲤与草鱼相似,鲢与鳙相同;罗非鱼的鳞片首先出现于尾柄,为由后向前发展型。 鳞片出现、复盖过程同全长及年龄的关系的比较观察和回归分析表明,这一过程的始末及速度主要同体长增长有关,同年龄关系不大。 鳞被发育过程不仅反映了不同鱼类的不同生长规律,亦可能有助于认识鱼类间的亲缘关系。

Results on feeding habits of mullet fry in brackish water ponds applied withmunures for producing natural feed is obtaind. The mullet fry below 20 mm in totallength feed mainly on zooplanktons, beyond 20 mm, the feeding habit is rapidlydiversified. The palatable starting feed of mullet fry is the nauplius and small cope-pods. There is a diurnal rhythm for feeding intensity of mullet fry. Feeding beginswith sunrise and stops at sunset, maximum fullness is attained before sunset. The fryessentially not take food...

Results on feeding habits of mullet fry in brackish water ponds applied withmunures for producing natural feed is obtaind. The mullet fry below 20 mm in totallength feed mainly on zooplanktons, beyond 20 mm, the feeding habit is rapidlydiversified. The palatable starting feed of mullet fry is the nauplius and small cope-pods. There is a diurnal rhythm for feeding intensity of mullet fry. Feeding beginswith sunrise and stops at sunset, maximum fullness is attained before sunset. The fryessentially not take food at night. Therefore. feeding activity of mullet fry may relys,on visual acuity.

本文报导了在半咸水池塘中梭鱼仔幼鱼的摄食习性。梭鱼仔幼鱼在全长20毫米前以摄食浮游动物为主;20毫米后,由于浮游动物数量急剧减少,摄食的种类迅速增多。梭鱼仔鱼适口的开口饵料是桡足类的无节幼体和桡足幼体。适口饵料生物的宽度为口宽的25—71%。梭鱼稚鱼昼夜摄食强度有一定的节律:日出前后开始摄食,日落前饱食指数最高;夜晚基本不摄食。

 
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