幼体期

复眼出现于无节幼体期Ⅲ。

The compound eye forms at the nauplius stage ⅲ .

中华绒螯蟹溞状幼体期复眼超微结构的观察

Ultrastructure of compound eye in zoaea of Eriocheir sinensis

前无节幼体期前肠开始发生，至后无节幼体期先后形成口道、食道和胃等结构；

The fore gut begins to form at the egg nauplius stage and is made up by stomodaeum , esophagus and stomach ;

在受精卵和氵蚤状幼体期无苹果酸脱氢酶酶带显示，卵裂期酶带数最多，酶活性相对也最强，以后随着发育的进行，酶带数和酶活性都有减弱的现象；

No MDH enzyme bands were observed in fertilized eggs and at zoaea stages , while most bands and the strongest activities emerged at cleavage stages .

总糖含量呈下降趋势，由受精卵期占干重的5.65%下降到溞状幼体期的1.9%。

The content of both total carbohydrate and total protein were decreased with embryonic development . The carbohydrate content reduced from 5.65 % of dry weight in the fertilized egg to 1.9 % in the zoea .

结果表明，1.虾苗酶活力结果为：类胰蛋白酶及胃蛋白酶的活性有差异，溞状幼体期<糠虾幼体期<仔虾期；

The results indicate that : 1 . The activities of trypsin-like enzyme and pepsin were different in different stage of the larvae of prawn : Penaeus chinensis Zoea stage < Mysis stage < Post larval stage .

碳水化合物在胚胎发育早期逐渐上升，囊胚期含量最高，为胚胎重的13.99%，原肠期下降为8.40%，溞状幼体期的含量为3.05%，孵化出膜后碳水化合物含量继续下降到2.16%。

During the whole embryonic development stage the highest content of the carbohydrate appear in Blastula stage is 13.99 % and the lowest is 3.05 % at the zoea stage . After hatched the content of the protein , total amino acid and the carbohydrate go on decreasing .

脑神经细胞在无节幼体Ⅵ期（N6）初步分化为2类：Ⅰ类神经细胞核着色浅，异染色质较少；

Two kinds of nerve cells were differentiated at N_ ( 6 ) phase .

结果证实中华绒螯蟹溞状幼体Ⅰ期的PNR在110h左右。

The result showed that the PNR of Zoea - ⅰ was about 110h .

环境因素诱发锯缘青蟹幼体发育期变化的研究

Studies on the developmental changes of the Scylla serrata ( forskal ) larva after environmental induction

在无节幼体Ⅰ期样品中，血细胞总数和大颗粒细胞数量较胚胎期都显著增加，反映了对虾免疫系统随着胚胎发育的进行而加强。

Increased number of both total and granular haemocytes at nauplius I stage impressed a possible enhancement of the immune system as the embryogenesis progressed .

从大眼幼体至第一期幼蟹需4d，存活率为17.3%。

It needs 4d from megalopa larva to the first stage larval crab with the survival rate 17.3 % .

河蟹大眼幼体培育至期仔蟹的试验

Experiment on Culturing Crab from Megalopa to ⅲ Stage Larval

棕色田鼠雄性幼体不同发育期犁鼻器和副嗅球的组织结构

Histological Structure of the Vomeronasal Organs and Accessory Olfactory Bulbs of Male Mandarin Voles ( Microtus mandarinus ) at Different Postnatal Ages

幼体在胚胎期和哺乳期能从母体获得食物信息，或向有觅食经验的同胞伙伴学习处理食物的经验。

The offspring could learn foraging information from mother in uterus and weaning , and get also foraging information from experienced forager through social learning .

本试验用08%盐度人工海水培育幼体，其期仔蟹成活率比对照组提高34倍。

The test reared larvae in 0 8 % salinity of artificial salt water which has improved the survival rate of juvenile crabs as much as 3 4 times than the control group .

在轮虫、卤虫无节幼体混合饵料期，轮虫的最适密度是7～10ind/mL，卤虫无节幼体的最适密度是5～7ind/mL。

At the mixed food stage of rotifer and nauplii of Artemia , the optimal rotifer and nauplii of Artemia densities should be 7 ~ 10 ind / mL and 5 ~ 7 ind / mL , respectively .

采用四因子三水平的正交实验法，研究了河蟹大眼幼体至Ⅲ期幼蟹阶段对饲料中蛋白质、脂肪、矿物盐及复合维生素的适宜需求量。

The suitable requirements of Chinese mitten crab ( Erioecheir sinesis ) for protein , fat , mineral and compound vitamin in feeds from megalopa to ⅲ Phase Larvae stage were studied by the cross tests method of four factors and three levels .

从蚤状幼体到大眼幼体各期饵料的适宜投喂量，以其目最大摄食量的70%为宜。

The biggest feeding dose per day at each stage from Zoaea to Megalopa is as good as 70 % .

胚胎发育阶段有4个时期：原肠期、担轮幼体早期、担轮幼体晚期和担轮幼体孵化瞬期。

Embryonic development period including 4 stages : gastrula stage , early trochophore stage in egg membrane , late trochophore stage in egg membrane and at the moment of hatching stage ;

结果显示，黑斑口虾蛄在胚胎和幼体的发育过程中，水的体积分数先降低，至原肠胚期开始升高，到第二相幼体期达到最高，之后又有所回落；

The results showed that water content decreased first , then increased in the gastrula stage of embryonic development , reached the highest content at the second phrase larvae stage and then began to decrease from the third phase larva stage .

在盐度为23～39范围内，叶状幼体能正常生长、发育和变态，其中盐度为31时，叶状幼体Ⅱ，Ⅲ期的变态率分别为85%和48%；

In a range of 23 to 39 salinity , the phyllosoma larva grew , developed and metamorphosed normally , the metamorphosis rate of which in stages 2 and 3 was 85 % and 48 % , respectively , when cultured in seawater of 31 salinity .