排序方式: 共有21条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
施氏獭蛤(Lutraria sieboldiiReeve)俗称象鼻螺,隶属瓣鳃纲(Lamellibranchia)、异齿亚纲(Heterodon-ta)、帘蛤目(Veneroida)、蛤蜊总科(Mactracea)、蛤蜊科(Mactridae)、獭蛤属(Lutraria),自然分布于热带、亚热带的海区,在我国主要分布在浙江、广东、广西和海南的部分沙或沙泥底质的海区。施氏獭蛤足部和水管非常发达,肉质鲜美,经济价值较高。其生长速度较快,一龄贝平均壳长可以达到6 cm以上,养殖1.5 a即可达到理想的商品规格,适于人工养殖。李琼珍等对大獭蛤的胚胎、幼虫及稚贝发育及盐度对大獭蛤胚胎发育的影响进行了研究[3,4],蔡英亚… 相似文献
5.
企鹅珍珠贝人工苗生长的初步观察 总被引:3,自引:0,他引:3
为了解企鹅珍珠贝生长规律,观察了壳高2.5~5.0mm的出池幼苗,按月测量其生长参数和成活率,以及环境因子。结果表明,企鹅珍珠贝生长最快的月份为7~11月和次年4~6月,壳长,壳高和壳宽月均增加量分别为3.8~13.0mm、4.7~11.2mm、2.3~3.8mm,月成活率97.8%~98.6%。企鹅珍珠贝生长最慢月份是11月至次年3月。 相似文献
6.
组织蛋白酶D是溶酶体天冬氨酸蛋白酶家族的主要成员,广泛参与动物机体细胞内蛋白质的降解过程,对维持细胞稳态和正常代谢具有重要的作用。为研究组织蛋白酶D在甲壳动物非特异性免疫和幼体发育过程中的作用,本研究采用RACE技术首次克隆得到日本囊对虾组织蛋白酶D基因cDNA序列,命名为MjCatD,其中开放阅读框长为1161 bp,编码386个氨基酸残基。序列分析和同源建模显示该基因编码的蛋白含有保守的N-糖基化位点、天冬氨酸蛋白酶签名序列、酶活化位点和非消化性组织蛋白酶D的特征序列,并且呈保守的双叶形结构。同源性比较和系统进化分析发现,MjCatD与斑节对虾、美洲螯龙虾和脊尾白虾相似性较高,并且与它们紧密聚为一支。实时荧光定量PCR结果显示,MjCatD基因在日本囊对虾多个组织中均有表达,其中肝胰腺中表达量最高。在白斑综合征病毒(white spot syndrome virus, WSSV)感染后3~24 h日本囊对虾肝胰腺中MjCatD的表达量逐渐下降,而在48 h急剧上调至最高表达量并且与对照组差异极显著(P<0.01)。此外,MjCatD基因在幼体发育不同阶段中也表现出明显的变化趋势。以上研究表明,MjCatD基因可能参与日本囊对虾先天免疫反应和幼体发育过程。 相似文献
7.
8.
The kuruma prawn, Marsupenaeus japonicus, is one of the most cultivated and consumed species of shrimp. However, very few molecular genetic/genomic resources are publically available for it. Thus, the characterization and distribution of simple sequence repeats (SSRs) remains ambiguous and the use of SSR markers in genomic studies and marker-assisted selection is limited. The goal of this study is to characterize and develop genome-wide SSR markers in M. japonicus by genome survey sequencing for application in comparative genomics and breeding. A total of 326 945 perfect SSRs were identified, among which dinucleotide repeats were the most frequent class (44.08%), followed by mononucleotides (29.67%), trinucleotides (18.96%), tetranucleotides (5.66%), hexanucleotides (1.07%), and pentanucleotides (0.56%). In total, 151 541 SSR loci primers were successfully designed. A subset of 30 SSR primer pairs were synthesized and tested in 42 individuals from a wild population, of which 27 loci (90.0%) were successfully amplified with specific products and 24 (80.0%) were polymorphic. For the amplified polymorphic loci, the alleles ranged from 5 to 17 (with an average of 9.63), and the average PIC value was 0.796. A total of 58 256 SSR-containing sequences had significant Gene Ontology annotation; these are good functional molecular marker candidates for association studies and comparative genomic analysis. The newly identified SSRs significantly contribute to the M. japonicus genomic resources and will facilitate a number of genetic and genomic studies, including high density linkage mapping, genome-wide association analysis, marker-aided selection, comparative genomics analysis, population genetics, and evolution. 相似文献
9.
10.
方斑东风螺人工育苗试验 总被引:9,自引:0,他引:9
2003年3月31日至8月31日,在水温25.0~30.0℃,盐度28.3~35.1,pH8.1~8.5时,在广东省湛江雷州市进行了方斑东风螺人工育苗试验,培育出壳高6~10mm幼螺300多万只。结果表明。投喂新鲜海鱼、蟹类、虾类,短时间阴干、流水刺激或流水培育可以诱导方斑东风螺亲螺交配产卵;幼虫培育密度以2.0~2.5万个/m^3为宜,幼虫培育期间投喂多种天然混合饵料,可以提高幼虫成活率,缩短幼虫浮游时间,提前变态;及时投放附着砂,有利于幼虫顺利变态;壳高5~10mm幼螺培育密度保持在1500个/m^2左右,每10~15d清洗一次附着砂,可加速幼螺的生长,提高幼螺成活率,有效防止病害的发生。 相似文献