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 叉长
 fork length
 The equation between body weight and fork length is W=4.5026×10~(-5)×FL~(2.8200). 体重与叉长关系式为W=4.5026×10-5×FL2.8200。 短句来源 (2) Growth parameters are estimated to be fork length L ∞=31.2 cm, W ∞=426.5 g, K=0.42, and t 0=-0.376; ( 2 )其vonBertalanffy生长方程的各参数为 :渐近叉长L∞ =31 2 (cm ) ,渐近体重W∞ =4 2 6 5(g) ,生长系数K =0 4 2 ,t0 =- 0 376。 短句来源 The length-weight rela- tionship formulas are W=2.5687×10~(-7)L~(3.7545),W'=1.003×10~(-6)L~(3.5140), where W and W'represent net body weight(g)and total body weight(g)respectively, L is fork length. 其纯体重 W 和总体重 W’与叉长的相关式分别为 W=2.5687×10~(-7)L~(3.7545),W’=1.003×10~(-6)L~(3.5140); 短句来源 The results indicated that the fork length ranged from 85 cm to 186 cm,body weight from 11.5kg to 132.5kg,and the estimated age from 2 to 6 years old,which was based on counts of vertebral growth increments. 结果表明,叉长组成为85~186 cm,体重组成为11.5~132.5kg,年龄为2~6龄。 短句来源 The turning points of age,body weight and fork length were aged 5.3,55.8kg and 195cm,respectively. 大青鲨的生长拐点年龄为5.3yr,拐点体重为55.8kg,拐点叉长为195 cm。 短句来源 更多
 “叉长”译为未确定词的双语例句
 The relationship of intestines-fork length is exprcssdcd by:Y= 29.802 5+2.252 2L. 当年生棱鲻的肠长和叉长的关系为:y=-29.802 4+2.252 2L。 短句来源 The variation on sex ratio is insignificant and maintaining to some 0.5 when LJFL falls into 100-150 cm. 当渔获个体的叉长范围在100~150 cm之间时,性比组成的变化相对较小,基本上维持在0.5左右,也就是说雌雄个体数量大体保持平衡; 短句来源 The turning points of age, weight and length were age 2.7, 450 g and 320 mm respectively. 鲐鱼的生长拐点年龄为2.7yr,拐点体重为450g,拐点叉长为320mm。 短句来源 Experiments on the consumption,growth and ecological conversion efficiency of dotted gizzard shad(Clupanodon　punctatus)were　conducted　in　a　shrimp　rearing　pond　in　the　coast　of　Laizhou　Bay,the　Bohai　Sea,in　September　1998.The ElliottPersson model was used to determine its feeding periodicity,to quantify its evacuation rate,consumption rate and food/energy conversion efficiency. 1998年9月在山东省莱州市过西镇,对养虾池中斑鰶(Clupanodon　punctatus)(叉长49.0～130.0mm,体重1.38～27.39g)的摄食与生态转换效率进行了研究。 采用ElliottPersson(1978)方法,从研究斑鰶的摄食周率出发,对其排空率、摄食率以及食物转换效率进行了定量。 短句来源 Taking into account character of sex mature, possible fishing effort and economic requirement, this paper suggests that Lc should be increased to 15.0 cm from 12.0 cm. 综合考虑性成熟特征、当前可能的捕捞强度及经济效益,在提高产量而不破坏资源的前提下,建议珠江河口及附近水域银鲳的开捕叉长应由12.0 cm增加至15.0 cm。 短句来源 更多
 相似匹配句对
 Introduction of fork-filament fabric 叉枝长丝织物的初步探讨 短句来源 long time of deformation; 持续时间长； 短句来源 Conclusion:Long term contact lens wear can induce corneal tissue changes. [ 结论 :长? 短句来源 The fry between 58-82 mm in fork length is the transformable stage of its feeding habits. 叉长58～82 mm 的幼鱼为食性转变阶段。 短句来源 KNIFE & FORK 刀与叉 短句来源

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 fork length
 It was 60 cm in fork length (FL) and 7 kg in weight. Fork length and total weight for brown trout varied by 6.9-22.1 cm and 4.9-158.5 g for males, by 6.8-26.1 cm and 4.3-211.9 g for females, respectively. Fork length and total weight at the same age classes were not statistically significant between males and females. Feeding of reGH-GS, reGH-HP55 and rcsGH-GS diets resulted in significant increases in body weight and fork length over those of controls. Discriminant analysis using the power equation y=axb was negative for caudal fin span (S) versus fork length (FL) in C. 更多
 1. The food organisms of young mackerel of the year were diverse in species and they included polychaeta, Chaetognatha (Sagitta crassa), Copepoda, Amphipoda (young Themisto gracilipes), Caprellidea, Cephalopoda (Idiosepius paradoxa), fishes (young anchovy, Engraulis japonicus, young mugil, etc.), but fishes, cephalopods and crustaceans were the major varieties. Young mackerel of the year also ate seaweeds and other kinds of plant seeds, sand and mud. 2. In the Yantai-Weihai coastal region, young mackerel of... 1. The food organisms of young mackerel of the year were diverse in species and they included polychaeta, Chaetognatha (Sagitta crassa), Copepoda, Amphipoda (young Themisto gracilipes), Caprellidea, Cephalopoda (Idiosepius paradoxa), fishes (young anchovy, Engraulis japonicus, young mugil, etc.), but fishes, cephalopods and crustaceans were the major varieties. Young mackerel of the year also ate seaweeds and other kinds of plant seeds, sand and mud. 2. In the Yantai-Weihai coastal region, young mackerel of the year, less than 89 mm FL in size, fed mainly on planktonic organisms. When they reached to the size larger than 80 mm, they could take various specieses of food organisms, showing their omnivorous feeding habits. There was a little change in food items taken by mackerel from year to year. In the Qingdao coastal region young mackerel of the year fed mainly on Idiosepius paradoxa, juveniles of Themisto gracilipes and juveniles of fish, but some groups fed among the dense clusters of seaweeds, consequently, in their stomach Caprellidea, seahorse, thread of hemp, etc. could be found. 3. As the FL of young mackerel of the year become longer, a slight change in their preference of food items could be observed, though it was not conspicuous. This was due to the feeding habits of the young fish of 35 mm FL was nearly similar to that of the adult and in the shallow coastal waters planktonic organisms were scarce but young anchovies (Engraulis japonicus) and mugils and Idiosepius paradoxa, etc. were in abundance. 4. Young mackerel of the year fed day and night. At night they followed the tide and came into the shallow coastal waters where they snatched juveniles of anchovy and Themisto gracilipes throughout the whole night and daring the daytime they fed on planktonic organisms, benthos, young fishes, seaweeds and other kinds of plant, seeds, etc.. 5. Since the adult mackerel fed mainly on adults of anchovy (Engraulis japonicus) and Themisto gracilipes, young mackerel of the year fed mainly on the juveniles of anchovy and Themisto gracilipes. There was a close relation in nutrition between mackerel and anchovy ane Themisto gracilipes. Adult mackerel lived in the coastal waters deeper than 20 meters, where they searched their food organisms, while young mackerel of the year lived in the coastal waters shallow than 20 meters, where they might grew up and took these areas as their nursery grounds. 1.当年生鲐鱼幼鱼摄食种类十分广泛,包括多毛类、毛颚类的强壮箭虫、桡足类、端足类的细长脚(虫戎)幼体、钩虾、麦杆虫,头足类的微鳍乌贼,鱼类的鳀鱼幼鱼、梭鱼幼鱼等,其中以鱼类、头足类、甲壳类为主;并吞食海藻碎片、植物碎屑、种子、砂泥等,有杂食性的表现。 2.烟威沿岸海区叉长35—194毫米当年生鲐鱼幼鱼以微鳍乌贼、细长脚(虫戎)幼体、鯷鱼幼体等为主要食物。叉长80毫米以下个体主要以浮游生物为食,80毫米以上个体摄食种类广泛,有杂食性表现。频年摄食种类变化不大。青岛沿岸当年生鲐鱼幼鱼也以微鳍乌贼、细长脚(虫戎)幼体、鱼类幼鱼等为主要食物,但有部分群体在海藻丛中摄食,所以在胃中出现麦杆虫、海马、麻绳丝等。 3.随着体长增长有食物转化现象,但不很显著。原因:一为当年生鲐鱼幼鱼叉长35毫米即近似成鱼的摄食习性,一为沿岸浅水浮游生物较贫乏,鲐鱼、梭鱼等幼鱼和微鳍乌贼等较多。 4.当年生鲐鱼幼鱼昼夜均进行摄食,夜间各个时间随着潮流游到沿岸浅水攫食鯷鱼幼鱼和细长脚(虫戎)幼体。白天摄食浮游生物、底栖生物、鱼类幼鱼以及海藻碎片、植物碎屑、种子等。 5.鲐鱼的成鱼以鯷鱼和细长脚(虫戎)为主要食...1.当年生鲐鱼幼鱼摄食种类十分广泛,包括多毛类、毛颚类的强壮箭虫、桡足类、端足类的细长脚(虫戎)幼体、钩虾、麦杆虫,头足类的微鳍乌贼,鱼类的鳀鱼幼鱼、梭鱼幼鱼等,其中以鱼类、头足类、甲壳类为主;并吞食海藻碎片、植物碎屑、种子、砂泥等,有杂食性的表现。 2.烟威沿岸海区叉长35—194毫米当年生鲐鱼幼鱼以微鳍乌贼、细长脚(虫戎)幼体、鯷鱼幼体等为主要食物。叉长80毫米以下个体主要以浮游生物为食,80毫米以上个体摄食种类广泛,有杂食性表现。频年摄食种类变化不大。青岛沿岸当年生鲐鱼幼鱼也以微鳍乌贼、细长脚(虫戎)幼体、鱼类幼鱼等为主要食物,但有部分群体在海藻丛中摄食,所以在胃中出现麦杆虫、海马、麻绳丝等。 3.随着体长增长有食物转化现象,但不很显著。原因:一为当年生鲐鱼幼鱼叉长35毫米即近似成鱼的摄食习性,一为沿岸浅水浮游生物较贫乏,鲐鱼、梭鱼等幼鱼和微鳍乌贼等较多。 4.当年生鲐鱼幼鱼昼夜均进行摄食,夜间各个时间随着潮流游到沿岸浅水攫食鯷鱼幼鱼和细长脚(虫戎)幼体。白天摄食浮游生物、底栖生物、鱼类幼鱼以及海藻碎片、植物碎屑、种子等。 5.鲐鱼的成鱼以鯷鱼和细长脚(虫戎)为主要食物,当年生鲐鱼幼鱼也以鯷鱼幼鱼和细长脚(虫戎)幼体为主要食物。因此,鲐鱼成、幼鱼对鯷鱼、细长脚(虫戎)的营养关系十分密切。鲐鱼分布在水深20米以外的近海索饵,当年生鲐鱼幼鱼分布在沿岸育肥,这样,促使鲐鱼成、幼鱼各自充分利用分布范围内所能得到的食物,调节成、幼鱼的需要和加速当年生鲐鱼幼鱼的生长。 Based on the biometrical data obtained during the period of 1970-1977, the sexual maturity, fecundity and growth characteristics of Yellow Sea herring have been studied. A number of fisheries biological, parameters have been acquired from this study. The results are summarized as follows. 1. Yellow Sea herring reaches maturity at the age of 2 years and 99% of the fish of this age become matured. Sexually matured 1 year old fish and immatured 2 years old fish are very few, both of them constitute only 1% of the... Based on the biometrical data obtained during the period of 1970-1977, the sexual maturity, fecundity and growth characteristics of Yellow Sea herring have been studied. A number of fisheries biological, parameters have been acquired from this study. The results are summarized as follows. 1. Yellow Sea herring reaches maturity at the age of 2 years and 99% of the fish of this age become matured. Sexually matured 1 year old fish and immatured 2 years old fish are very few, both of them constitute only 1% of the same age group. This shows the characteristics of sexual maturation of the fish. The first maturity of the fish is confined to a definite age. It also shows that the recruitment of the fish is rather quick. The minimum fork length and body weight of mature individuals for the first time were: 200mm and 80g for female and 168mm and 46g for male respectively. At the time when large quantities of the fish begin to mature the fork length and body weight for both males and females vary between 210-250mm and 90-110g respectively. There is no great difference in fork length and body weight between males and females. 2. From the fish sampled individual absolute fecundity of Yellow Sea herring E is found to be 19.3-78.1 thousand eggs, individual relative fecundity E/L (fork length) 93-269 eggs and E/W (net body weight) 210-379 eggs. Individual absolute fecundity E and individuall relative fecundity E/L increase with the increasing of net body weight in a linear relationship; with the increasing of fork length in an exponential functional relationship and with the increasing of age in a stepwise relationship. Because the number of eggs per unit weight is quite stable, individual relative fecundity E/W has no relationship with the variances of weight, length and age. 3. The development of eggs of Yellow Sea herring exhibits a definite synchronism. The fish belongs to the type of spawning once in every reproductive season. 4. The rate of growth of Yellow Sea herring varies with seasons and it can be definitely divided into several stages. It is fast in summer and slow in autumn and early winter. But it becomes fast again from late winter to its prespawning period. At the spawning and post spawning period—the recovery phase, the rate of growth reaches its minimum level. However, even in this period the phenomenon of cessation of growth never appears. This growth aspect is connected with seasonal variation of feeding. 5. The von Bertalanffy equation expressed a general rule of the yearly growth of Yellow Sea herring. Based on the parameters presented in this paper and by the method for determining the optimum number, the following values have been obtained: L_∞=305, W_∞=253, K=0.66, t_o=-0.198 and t_1=1.5. Before the fish reach the age of three years old, they grow more rapidly. At the early stage of growth the fish increase in length more rapid than in weight. When they reach sexual maturation of the first time weight increase is more rapid than length increase. After they are 4 years old, rate of growth slows down. Length increase ceases earlier than weight increase. 6. The growth aspect of Yellow Sea herring has certain influence on fecundity and sexual maturation, but it has no definite correlation with the density of population. And it is not reliabe to assess the abundance of resources by the growth aspect of the fish. 本文根据1970—1977年生物学测定资料,对黄海鲱鱼(青鱼)的性成熟、生殖力和生长特性进行了分析讨论,获得了一些渔业资源生物学参数,其要点如下: 1.黄海鲱鱼2岁时99％的个体达性成熟,1岁鱼性成熟者和2岁鱼性未成熟者极少,约占1％左右,表现出初次性成熟年龄集中,补充速度快的特点。初次性成熟的最小叉长和体重:雌鱼是200毫米、80克;雄鱼是168毫米、46克。开始大量性成熟的叉长和体重,雌雄两性差异不大,都在210—250毫米、90—110克范围内。 2.在计数样本范围内,黄海鲱鱼个体绝对生殖力E为1.93—7.81万粒,个体相对生殖力E/L(叉长)为93—269粒,E/W(纯体重)为210—379粒。个体绝对生殖力E和个体相对生殖力E/L与纯体重呈直线增长关系,与叉长呈幂函数增长关系,与年龄呈阶段性增长关系。因单位重量卵子数量较为稳定,个体相对生殖力E/W与重量、长度、年龄的变化无关。 3.黄海鲱鱼卵子发育具有明显的同步性,属一次排卵类型。 4.黄海鲱鱼年内生长有明显的阶段性,即夏季生长迅速,秋季及冬初生长缓慢,冬末至产卵前又重新加速,产卵期及产卵后恢复期生...本文根据1970—1977年生物学测定资料,对黄海鲱鱼(青鱼)的性成熟、生殖力和生长特性进行了分析讨论,获得了一些渔业资源生物学参数,其要点如下: 1.黄海鲱鱼2岁时99％的个体达性成熟,1岁鱼性成熟者和2岁鱼性未成熟者极少,约占1％左右,表现出初次性成熟年龄集中,补充速度快的特点。初次性成熟的最小叉长和体重:雌鱼是200毫米、80克;雄鱼是168毫米、46克。开始大量性成熟的叉长和体重,雌雄两性差异不大,都在210—250毫米、90—110克范围内。 2.在计数样本范围内,黄海鲱鱼个体绝对生殖力E为1.93—7.81万粒,个体相对生殖力E/L(叉长)为93—269粒,E/W(纯体重)为210—379粒。个体绝对生殖力E和个体相对生殖力E/L与纯体重呈直线增长关系,与叉长呈幂函数增长关系,与年龄呈阶段性增长关系。因单位重量卵子数量较为稳定,个体相对生殖力E/W与重量、长度、年龄的变化无关。 3.黄海鲱鱼卵子发育具有明显的同步性,属一次排卵类型。 4.黄海鲱鱼年内生长有明显的阶段性,即夏季生长迅速,秋季及冬初生长缓慢,冬末至产卵前又重新加速,产卵期及产卵后恢复期生长量最小,但没有出现明显的停止现象。这一规律与摄食的季节变化有关。 5.von Bertalanffy生长方程表达了黄海鲱鱼年问生长的一般规律,根据本文提出的参数最佳值测定方法,求得:L_∞=305,W_∞=253,k=0.66,t_o=-0.198,t_I=1.5。黄海鲱鱼3岁以前生长较为迅速,但生长初期,以长度生长较快,至初次性成熟前后,以重量生长较快;4岁以后生长变得缓慢了,长度生长较重量生长提前结束。 6.生长状况对黄海鲱鱼的生殖力及性成熟均有一定影响,但与种群密度之间无明显的相关关系,以生长的好坏来判断资源状况是没有把握的。 The present paper deals with the composition of food organisms, the seasonal variations of feeding intensity, and the relationships between the digestive organs and feeding habits of lizard fishes (Saurida tumbil, Saurida undosquamis and Trachinocephalus myops) collected from South Fujian and Taiwan Bank fishing ground. The results show that the three species of lizard fishes belong to demersal fishes,which are carnivorous with cannibalism. The compositions of food organisms of these fishes are rather simple,... The present paper deals with the composition of food organisms, the seasonal variations of feeding intensity, and the relationships between the digestive organs and feeding habits of lizard fishes (Saurida tumbil, Saurida undosquamis and Trachinocephalus myops) collected from South Fujian and Taiwan Bank fishing ground. The results show that the three species of lizard fishes belong to demersal fishes,which are carnivorous with cannibalism. The compositions of food organisms of these fishes are rather simple, whereas they feed chiefly on fish and Cephalopods, and less amount of Macrura, Brachyura and Stomatopoda. In general, the size of the prey (fishes) increases with the fork length of the predator(Saurda tumbil or S. undosquamis). It has been shown that those lizard fishes are feeding throughout the year, and the feeding intensities of Saurida tumbil and S.undosquamis become higher during the spawning season from March to April. The structures of digestive organs are adapted to their carnivorous habits which Saurida tumbil and S. undosquamis are similar to each other, and their feeding habits are more ferocious than that of Trachinocephalus myops. 本文对闽南—台湾浅滩渔场狗母鱼类(多齿蛇鲻、花斑蛇鲻和大头狗母鱼)的食料生物组成、摄食强度的季节变化以及消化器官与食性等方面进行了探讨。结果表明,这三种狗母鱼类都属于游泳动物食性的底层鱼类,而且是同种残食的中级肉食性鱼类,其食料生物组成比较简单,主要摄食鱼类和头足类,还兼食长尾类、短尾类和口足类。被捕食对象的大小,随着捕食对象(多齿蛇鲻或花斑蛇鲻)叉长的增加而增大。狗母鱼类周年均有摄食,多齿蛇鲻和花斑蛇鲻在产卵盛期(3—4月)摄食强度较高。它们的消化器官的形态结构与其肉食性相适应,多齿蛇鲻和花斑蛇鲻的消化器官和食性相近似,比大头狗母鱼的食性较凶猛。 << 更多相关文摘
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