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spawning ground
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  产卵场
     3. The spawning ground of filefish covers a wide area from 25°30′ N to 30°00′N and 122°00′E to 126°30′E according to the distribution of the spawners, hatchedlarvae and juveniles and catch in spawning season, the area mainly covered from25°45′N to 27°00′N and 122°00′E to 123°30′E.
     3.从产卵个体、仔稚鱼和产卵盛期渔获量的分布判断东海绿鳍马面鲀的产卵场在25°30′—30°00′N、122°00′—126°30′E海区,范围较广,主要产卵场在25°45′—27°00′N、122°00′—123°30′E,水深100—120米的海区。
短句来源
     The results indicated that the SST was low between 1995 and 1997, high in 1999 and mediate in 1998 and from 2000 to 2002 in the spawning ground (20°-30°N, 140°-170°E) .
     在20°~30°N、140°~170°E产卵场海域,1995-1997年表温相对较低,而1999年偏高,1998年和2000-2002年则处在中间水平。
短句来源
     Based on the data obtained in 2001~2003 from 33 stations, the secondary production of macrobenthos from the anchovy spawning ground in the southern Yellow Sea was studied using Brey′s (1990) empirical formula.
     根据2001至2003年南黄海鳀鱼产卵期在鳀鱼产卵场33个站考察采集的大型底栖生物定量样品资料,利用Brey′s(1990)的经验公式对调查海区进行了大型底栖生物栖息密度、生物量、次级生产力和P/B值的研究计算.
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     Reason of Spawning Ground Destroying of Gymnocypris przewalskii (Kessler) in Qinghai Lake and Countermeasure of Its Conservation
     青海湖裸鲤Gymnocypris przewalskii(Kessler)产卵场破坏原因与保护对策
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     Studies on the feeding of anchovy (Engraulis japonnicus) post larva with a body length ranged from 2 5 mm to 17 9 mm and distributed in the spawning ground in the Southern waters of Shandong peninsula were conducted.
     研究了山东半岛南部鱼产卵场体长 2 .5~ 17.9mm的鱼仔、稚鱼的摄食。
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  “spawning ground”译为未确定词的双语例句
     In the southern part of the Yellow Sea, where was known as an important spawning ground of anchovy, the seasonal variations of zooplankton were studied in details with respect to species composition, abundance, biomass and vertical distribution.
     对南黄海浮游动物的种类组成、分布及其时空变化进行了研究,并与历史资料进行了比较;
短句来源
     Most people assumed that such hydroelectric projects might result in the reproduction isolation of Southern catfish and the destruction of fish spawning ground.
     此外,了解野生状态和人工养殖条件下南方鲶种群各自的遗传结构及遗传多样性对于该鱼的遗传多样性保护和遗传育种亦十分重要。
短句来源
     The bends in the lake is the spawning ground. Fertilized egg hatching takes 312 hours 15 minutes at the water temperature of 5. 9 - 14. 2℃The just hatched larva is 2. 44mm in total length, with the melanophores around the anus open.
     太湖短吻银鱼胚胎发育期间具有很强的生命力,可在静水中孵化水温4.9-14.2℃时,受精卵经过312小时15分孵化。
短句来源
     Expect for one spawning ground in each Zuo River and You River,the rest were evenly distributed in Yu River. At water temperature of 28-28.5℃,the incubation starting from fertilized eggs usually took 16.1 hours.
     在水温28~28.5℃的情况下,自受精到孵化所需时间为16 h 10 min,积温453℃.
短句来源
  相似匹配句对
     The spawning ground is northwest of Diaoyu Dao.
     产卵场在我国钓鱼岛西北部。
短句来源
     Ground Cherry
     酸浆(或称地樱桃)
短句来源
     Shallow Ground
     地表
短句来源
     An investigation of phytoplanktons in the spawning ground of Yunyang section of the Changjiang River
     长江云阳江段四大家鱼产卵场浮游植物初步调查
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  spawning ground
This mechanism exists even without the Ekman drift and may play an important role in the transportation of the fish eggs and larvae from the southern Japan spawning ground to the food abundant Kuroshio-Oyashio transition zone.
      
Numerical experiments on the transport and dispersion of particles in and neighbouring areas of the Kuroshio were done to investigate the transport process of the fish eggs and larvae from the spawning ground to the downstream nursery ground.
      
Most post-spawning surubims left the spawning ground to forage elsewhere, but some stayed at the spawning site until the next spawning season.
      
Pre-spawning females swam at ground speeds of up to 31?km?day-1 in late September-December to pre-spawning staging sites located 0-11?km from the spawning ground.
      
The length of males migrating to the spawning ground decreased during the spawning season while the females' length showed no pattern.
      
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This paper is the second of a series of studies on the intraspecific variation offecundity of the Large Yellow Croaker, and is concerned with the peculiarities ofthe individual fecundity of the spawning population of Kuanching-yang, Fukian. The material for the present study was collected during the period from March-June, 1959 in the spawning ground. Based upon 173 samples studied, the results aresummarized as follows: 1. The individual absolute fecundity (r) varied between 39.9 and 900.6(×1000) (average,...

This paper is the second of a series of studies on the intraspecific variation offecundity of the Large Yellow Croaker, and is concerned with the peculiarities ofthe individual fecundity of the spawning population of Kuanching-yang, Fukian. The material for the present study was collected during the period from March-June, 1959 in the spawning ground. Based upon 173 samples studied, the results aresummarized as follows: 1. The individual absolute fecundity (r) varied between 39.9 and 900.6(×1000) (average, 256. 8 ); the individual relative fecundity r/l varied between1, 410 and 18, 610 (eggs/cm) (average, 7,540) and r/q between 125 and 907(eggs/g)(average, 548). The variability is shown diagrammatically as scatter diagrams offecundity and standard-length, body-weight, age, growth coefficient of condition,standard-length×body-weight (l·q) and (l·q)~(1/2) in Figs. 1-3, 8-11. 2. The dynamical peculiarities of individual fecundity (r and r/l) of theKuanching-yang spawning population, like the Taichu-yang spawning population,increase with increase in weight, length and age. The relations of individual absolutefecundity (r) and individual relative fecundity r/l to length and age are curved,but differently sloped, and to weight are linear. The individual relative fecundity r/qdoes not increase or decrease markedly with length, weight and age. 3. The relations of individual fecundity (r,r/l, r/q) to coeffecient of condition(K =W/L~3 × 100) and to relative condition coefficient (K=W/W ×100) are not quiteobvious, i .e. ) they do not increase or decrease regularly with K and K. 4. The fecundity coefficient (C=(l·q)/r) varied between 0.22 and 1.912,mostly between 0.42 and 0.82.The individual absolute fecundity (r) was found to be related to "l·q" and "(l·q)~(1/2)" linearly, it was like the relation between individualfecundity (r, r/l) and body-weight. Thus the fecundity coefficient is still a goodindex for determining the peculiarity of individual fecundity of fish. 5. The individual fecundity (r, r/l) not only increases with increase of lengthand weight, but also relates to peculiarity of sexual maturity, i .e. , the individualsof first maturity have a lower mean individual fecundity than individuals of repeatedsexual maturity. 6. The fast-growing individuals have a higher mean individual fecundity (r,r/l) than slow-growing individuals in the same age-group. Therefore growth is oneof the main influential factors.

本文是研究大黄鱼生殖力种内变异的第二篇报告。所依据的材料是1959年5月在福建东北部官井洋产卵场收集的,共计算了173个样品。据以观察分析的标本全系未出现透明和游离状卵子的典型Ⅳ期卵巢。卵子计数取样与处理方法以及术语概念均与作者在“浙江岱?洋大黄鱼个体生殖力的研究”一文中所述者完全相同。 生殖力是影响种群世代数量的最初一个环节,同时,福建官井洋大黄鱼春季生殖种群是闽-粤东族大黄鱼主要生殖种群之一;因此,了解这一生殖种群的个体生殖力特性不仅具有理论上的意义,而且对于进一步研究该种群数量变动及其渔业预报亦有实践意义。

The long-snout catfish—Leiocassis longirostris (Günther) has long been a valuablecommercial fish in the Yangtze valley,yet practically no information on its biologicalfeatures can be obtained from the literature.Age-composition,growth,spawning,feeding and the problem of maximum sustained yield of this fish have recently beeninvestigated for the first time.As material for age-determination,the pectoral spine,urohyal and vertebra havebeen used for comparison,and the first-named structure is found to be more suitablefor...

The long-snout catfish—Leiocassis longirostris (Günther) has long been a valuablecommercial fish in the Yangtze valley,yet practically no information on its biologicalfeatures can be obtained from the literature.Age-composition,growth,spawning,feeding and the problem of maximum sustained yield of this fish have recently beeninvestigated for the first time.As material for age-determination,the pectoral spine,urohyal and vertebra havebeen used for comparison,and the first-named structure is found to be more suitablefor this purpose.Formation of annulus in the pectoral spine occurs in the middleof June to July.The relationship between the age and the body length can be expressed by theequation L_t=980[1-e~(-0.24(t-0.22))].Owing to the fact that individuals of L.longirostris over 78.5 cm in length havea body form much more elongated than those under this length,the weight-lengthrelationship is better denoted by separate equations:For individuals under 78.5 cm in length:W_t=10730[1-e~(-0.24(t-0.22))]~(2.9914);For those over 78.5 cm in length:W_t=8670[1-e~(-0.24(t-0.22))]~(2.085).The relationship between the radius in the section of the pectoral spine and thelength of body is in linear regression.The length back-computed from the radius ofthe annulus generally coincides with the actual measurement of the body length,although there is indication of the so-called“anti-Lee phenomenon”in such back-computations.First maturity of L.longirostris occurs in individuals varied from 45.5 to 55.5cm in length and from 3 to 5 years of age.After the first maturity,reproductionrecurs in the successive years.It is found that the region from Chiengli to Hoshuiin the Yangtze River is the regular spawning ground.The individual absolute fecundity varies from 1,184 to 145,410 (69,264 on theaverage).Its relation to body length is expressed asR=0.0003311 L~(2.3613).The comparative spawning power is highest at 4 and 5 years old.The reproductivestock is composed of many age-classes,but the re-spawners are always dominant over the new spawners in number.L.longirostris is a predacious fish with a broad recipe,over 40 kinds of animalsbeing recovered from stomach contents.Small fishes of various kinds and shrimpsform the chief components.The total mortality of L.longirostris is calculated to be 0.425,with a naturalmortality of 0.235 and a catching mortality of 0.19.The actual harvestable age atpresent is from 4-years old onwards.The problem of maximum sustained yield isdiscussed.If the minimum harvestable age is to be raised to 5 years old and at thesame time fishing effort be intensified so as to elevate the fishing mortality to 0.30,the total yield of this fish might be expected to increase by 14 per cent,while thesize of the reproductive stock might still maintain a state of stability.

本文研究长江中下游长吻的种群生态学特性并进行渔业生物学分析。胸鳍棘、尾舌骨及脊椎骨都可用作年龄鉴定材料。用Brody-Bertallanffy的公式表述体长、体重与年龄的关系。调查生殖特性并分析比较产卵力及产卵群体的结构类型。以食物出现率和重量法评价各类食物在食料中的作用。由渔获物统计资料计算种群的自然死亡率和捕捞死亡率。通过比较各种捕捞强度和最小捕捞规格的不同的总渔获量和繁殖群体的相对数量,提出获得最大持续渔获量的捕捞强度和最小捕捞规格。

This paper deals with the histological structure of the ovaries of the sexually mature pond-cultured Grass Carp as well as river Grass Carp both before and after spawning. The results of our examination demonstrate that the Grass Carp is a type of fish that spawns only once a year.The fact that some of the female fish, after induced ovulation,spawn perfectly while the others spawn partially is owing to the spawners' different degrees of maturity. The female fish caught from the natural spawning ground...

This paper deals with the histological structure of the ovaries of the sexually mature pond-cultured Grass Carp as well as river Grass Carp both before and after spawning. The results of our examination demonstrate that the Grass Carp is a type of fish that spawns only once a year.The fact that some of the female fish, after induced ovulation,spawn perfectly while the others spawn partially is owing to the spawners' different degrees of maturity. The female fish caught from the natural spawning ground of the Hsiang River (in Hunan Province) also spawn perfectly or partially. The histological structure of the ovaries, after perfect spawning through induced ovulation, contains oocytes of phase Ⅰ and phase Ⅱ. The ovaries after partial spawning through induced ovulation contains phase Ⅰ, phase Ⅱ and phase Ⅳ (Ⅳ+, Ⅳ++ ). The histological structure of the ovary reaching full maturity without induced ovulation consists of phase Ⅰ, phase Ⅱ and phase Ⅳ(Ⅳ++ ). In the ovary of the Grass Carp spawner, no matter whether subjected to induced ovulation or not, there are no oocytes in phase Ⅲ. The above results are also true of the ovaries of the gravid Grass Carp caught from the Hsiang River which spawned perfectly, partially, or which had not yet spawned at the time of being caught. It is demonstrated that oocytes develop from phase Ⅲ into phase Ⅳ synchronously. Oocytes in the ovary of the pond-cultured Grass Carp, after perfect spawning in May, remains in phase Ⅱ during June, July, August and September and no new oocytes of phase Ⅳ are found in the spent ovary. Hence the ovary of the mature fish, after perfect spawning in late spring or early summer, cannot complete the course of development from phase Ⅱ through phase Ⅳ in the same year. The coefficients of maturity of the ovaries in the pond-reared Grass Carp exhibit only one peak during one reproductive cycle.

本文是对已达性成熟年龄的池养和江河雌性草鱼产卵前后卵巢组织学结构的研究。实验结果证明草鱼是一次产卵类型。经人工催产后的雌性草鱼,由于亲鱼的成熟程度存在个体间的差异,有的全产,有的部分产。在湘江天然产卵场捕得的雌性草鱼,也有全产和部分产的。人工催产全产后的卵巢组织学结构是Ⅰ、Ⅱ时相,部分产后的卵巢组织学结构是Ⅰ、Ⅱ和Ⅳ(Ⅳ+、Ⅳ++)时相,已达满熟阶段但未经人工催产的卵巢组织学结构是Ⅰ、Ⅱ和Ⅳ(Ⅳ+++)时相,以上都未发现有处于Ⅲ时相的卵母细胞。从江河天然产卵场捕得的全产、部分产和尚未产卵的雌性草鱼的卵巢组织学结构,与上述结果一致。证实由Ⅲ时相到Ⅳ时相是同步性的。5月全产后的雌性草鱼,其卵巢组织学结构在6-9月内处于第Ⅱ期,没有新的Ⅳ时相卵母细胞。因此,夏季全产后的雌性草鱼,不可能在当年夏季或秋季完成由Ⅱ-Ⅲ-Ⅳ时相的发育程序。草鱼的卵巢成熟系数在繁殖季节只出现一次高峰。

 
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