排序方式: 共有16条查询结果,搜索用时 15 毫秒
1.
为系统了解湖南省虾类的生物多样性,从1987年起,采集了湖南省各类水域题指虾类标本近10000号,并对其进行了系统研究。研究发现,湖南省共有匙指虾科虾类31种(亚种),隶属于米虾属、新米虾属、拟米虾属和缺鞭米虾属,其中有20种为湖南特有种,缺鞭米虾属为湖南特有属,报道了新米虾属、拟米虾属和缺鞭米虾属三属共10种的主要鉴别特征,地理分布与生活习性,并提供了种的检索表。 相似文献
2.
3.
自抱卵的中华锯齿米虾雌虾腹部剥离取卵裂期、囊胚期、原肠胚期和无节幼体Ⅰ期的胚胎置于培养皿中,暴露在紫外线下,照射剂量分别为0、1、2、4、8、16 W·s/cm^2,人工振荡培养箱中以速度55 r/min、温度25℃、湿度60%培养。每隔24 h在解剖镜下观察胚胎发育至48 h后进行数据分析,研究紫外线照射剂量对中华锯齿米虾胚胎发育的影响。结果表明,胚胎的存活率对紫外线具有明显的剂量依赖关系。随着紫外线照射剂量的增加,胚胎发育延缓。紫外线暴露后48 h的半数致死量分别为:卵裂期11.5 W·s/cm^2、囊胚期8.6 W·s/cm^2、原肠胚期12.0 W·s/cm^2、无节幼体Ⅰ期14.2 W·s/cm^2。相同的暴露剂量下,暴露时间对胚胎发育也有明显影响。 相似文献
4.
5.
Nobuaki?Niwa Jun?OhtomiEmail author Akakifumi?Ohtaka Stuart?R.?Gelder 《Fisheries Science》2005,71(3):685-687
6.
Assessment of a biofilm‐based culture system within zero water exchange on water quality and on survival and growth of the freshwater shrimp Neocaridina heteropoda heteropoda 下载免费PDF全文
Verónica E Viau Agustina Marciano Analía Iriel Laura S López Greco 《Aquaculture Research》2016,47(8):2528-2542
The contribution of biofilm to water quality and as a food source for the culture of the freshwater shrimp Neocaridina heteropoda heteropoda was assessed in indoor aquaria using a zero water exchange system. Two successive phases were conducted to evaluate biofilm development on different substrates (polyethylene net: PN, plastic bottles: PET, agrovelo: AV) and the effect of biofilm to shrimps culture. The biofilm grown on all substrates helped to keep a good water quality by the uptake of nitrogen compounds and the production of high levels of dissolved oxygen associated to the proliferation of autotrophic microorganisms. High survival, reproduction and hatching of shrimps were achieved in all groups mainly associated with good water quality. Final biomass of the shrimps was significant higher for PN and AV groups; while specific growth rate and the levels of lipids of the shrimps yielded similar values for all treatments indicating that the three substrates allowed the growth of a biofilm that resulted in a healthy food source with similar nutritional value for shrimps. The results show that the production of N. heteropoda heteropoda could be successfully conducted by a biofilm‐based culture system with no water exchange, and thus contributing to a better water use. All materials tested were suitable substrates for biofilm growth, though AV and PET could reduce significantly production costs when compared to the PN. Moreover, by the recycling and reuse of waste materials (such as plastic bottles) could contribute to the development of a responsible, sustainable and environmentally friendly culture method. 相似文献
7.
8.
9.
郑闽泉 《上海海洋大学学报》2002,(1):19-20
霞浦新米虾(新种)Neocaridina xiapuensis,sp.nov。与安徽新米虾Neocaridina palmata anhuiensis相似,但前者经三对步足无明显的两性异形现象,且雄性第二腹肢雄附肢的形态结构和较小的卵径与后者均有显著不同。 相似文献
10.
卵黄蛋白原(Vitellogenin,Vg)是广泛地存在于卵生脊椎和无脊椎动物体内的雌性特异性蛋白,是卵黄蛋白(vitellin,Vn)的前体,本文通过同源克隆的方法从成熟中华锯齿米虾的卵巢中克隆到了一条长474 bp的Vg cDNA序列。用DNAMAN中的Blast功能将此片段与罗氏沼虾(Macrobrachium rosenbergii)、高背长额虾(Pandalus hypsinotus)的Vg部分序列进行比对,结果发现中华锯齿米虾与罗氏沼虾和高背长额虾的同一性分别为64%与62%。此片段为中华锯齿米虾Vg cDNA全长序列的克隆及其表达奠定了基础。 相似文献