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1.
ABSTRACT:   Anesthetized body length ( La ), an accurate measurement of body size of Japanese sea cucumber Apostichopus japonicus , is measured by using l -menthol anesthetizer but it is difficult to apply La in the field. An estimation method of La from only one simultaneous measurement of body length ( L ) and body breadth ( B ), regardless of the degree of contraction or extension of the body, is proposed. In simultaneous measurement of L and B for each of 150 animals of both the green and the black types of A. japonicus , there were significant negative correlations between L and B in all animals. Further, √( L  ×  B ) was approximately constant regardless of the animals' body form (coefficient of variance: 0.01–0.06). Thus, the regression equations for Le , estimated La , were calculated: the green type, Le  = 2.32 + 2.02 × √( L · B ); and the black type, Le  = 1.34 + 2.12 × √( L · B ). The error values between Le from these equations and La were small. The variances of Le were approximately one-quarter of those of L and half of B . From these, the equations can be used for body size measurements taken in the field.  相似文献   

2.
利用300个EST-SSRs标记对普通二倍体鲫(Carassius auratus)自交F2代的181个个体进行基因型检测,并对其体重、体厚两种经济性状进行单标记回归分析。Permutation检验(10 000次)结果显示,38个标记与所检测的经济性状相关,其中26个标记达到显著性相关(P<0.05),12个标记达到极显著性相关(P<0.01)。在38个相关标记中,有27个标记与体重相关,25个标记与体厚相关,14个标记与体重、体厚均相关。对同一标记的不同基因型之间进行多重比较,找到了与两种经济性状相关的基因型。将与性状相关的38个标记与斑马鱼(Da-nio rerio)基因组序列进行BLAST同源性比对,找到10条相似性高且功能已知的EST-SSRs序列(E相似文献   

3.
尼罗罗非鱼出肉率与可量性状的相关性   总被引:5,自引:1,他引:4  
运用统计分析方法研究了吉富品系和埃及品系尼罗罗非鱼(Oreochro misniloticus)2龄成鱼雌、雄个体的出肉率和可量性状之间的相关性。结果显示,尼罗罗非鱼的平均出肉率为38.68%,雄性个体出肉率比雌性个体略高,吉富品系出肉率比埃及品系略高。尼罗罗非鱼出肉率与可量性状间存在较强的线性关系,拟合方程相关系数为0.985。在有显著意义的可量性状相关系数中(P0.01),与肉片质量和出肉率的相关性均最高的可量性状为体质量,相关系数分别为0.964和0.575;其次为体高、体长和体厚。而头长与肉片质量、出肉率均呈负相关关系。雄性个体的相关系数均高于雌性个体,在雄性个体中,出肉率与体质量的相关系数为0.630,与体高的相关系数为0.617,均为中等程度相关。对可量性状之间的比值与出肉率进行相关性分析,相关系数普遍比单个性状高,特别在雄性个体中表现明显。其中相关系数较高的比例组合有身长/头长比值(0.765)、体长/头长比值(0.732)、身长/体厚比值(0.703),均达到较强程度的相关,比单个性状的相关性有明显提高。结果表明,利用可量性状预测罗非鱼的出肉率是可行的。  相似文献   

4.
多棘海盘车体壁胶原蛋白的研究   总被引:1,自引:0,他引:1  
采用两种不同的方法从海盘车体壁中提取出酸溶性胶原蛋白(ASC)和胃蛋白酶促溶的胶原蛋白(PSC),得率分别为10.90%、61.43%。将ASC、PSC的氨基酸组成、理化性质与脊椎动物及其它无脊椎动物胶原蛋白进行比较,结果表明,ASC、PSC是典型的胶原蛋白。在此基础上对ASC、PSC进行了SDS-PAGE电泳,进一步表明制品的纯度较高,并且它们在分子大小、构型及性质上没有显著差异。  相似文献   

5.
Two types of triploid hard clams Mercenaria mercenaria were produced by inhibiting polar body I (PB1) or polar body II (PB2) with cytochalasin B. Treatments were applied at 22–23°C, with PB1 inhibition starting at 4–7 min postfertilization and ending when PB2 was first observed in control groups, and with PB2 inhibition starting at 17–23 min postfertilization and ending when 80% of control eggs released PB2. Triploid induction success was evaluated by chromosome counting in 2–4 cell embryos and by flow cytometry at larval and juvenile stages. PB2 inhibition produced more triploids (82%–100%) than PB1 inhibition (71%–83%), although the difference was not significant ( .088). Triploid percentages in PB1‐ or PB2‐inhibited groups showed a small but insignificant decline during the first 6 months. At month 3, PB1 and PB2 triploids were not different from their within‐group diploids, but significantly larger than control diploids; PB1 triploids were significantly larger than PB2 triploids ( .003). At month 6, PB1 triploids were not different from either within‐group or control‐group diploids, while PB2 triploids were significant larger than both within‐group and control diploid; PB1 triploids were smaller than PB2 triploids. At month 16, PB1 and PB2 triploids in one remaining replicate were not different from their within‐group diploids. Overall, this study shows that triploids can be efficiently produced by PB1 or PB2 inhibition, and their growth performance relative to diploids is variable depending on age and replicates or parental genotype.  相似文献   

6.
本文根据南京郊区3~6月养殖池塘中浮游植物和水体小气候的观测分析,指出藻类的数量和光合产物与池塘的水体小气候环境有密切关系,而水体小气候环境又与当地的天气气候条件有密切联系。  相似文献   

7.
饲料中添加叶黄素对胡子鲶体色的影响   总被引:21,自引:2,他引:19       下载免费PDF全文
冷向军 《水产学报》2003,27(1):38-42
进行了3个试验以考察饲料添加叶黄素对本地胡子鲶体色的影响。试验A比较了野生、半人工养殖、全人工养殖胡子鲶体色的差异,其皮肤叶黄素含量分别为8.01、4.64和1.61mg·kg-1鲜组织,肌肉叶黄素分别为2.06、1.83、0.96mg·kg-1鲜组织;试验B采用平均体重为52g的本地胡子鲶成鱼,在基础饲料中分别添加0、100、150、200mg·kg-1叶黄素,饲养6周后,成鱼皮肤叶黄素含量分别为1.07、5.88、7.02、7.81mg·kg-1鲜组织,肌肉叶黄素含量分别为0.64、1.35、1.81、1.86mg·kg-1鲜组织;试验C采用平均体重为3.2g的本地胡子鲶鱼种,在基础饲料中分别添加0、50、100、150mg·kg-1叶黄素,饲养6周后,鱼种皮肤叶黄素含量分别为3.2、8.73、11.49、12.51mg·kg-1鲜组织,肌肉叶黄素含量分别为0.87、1.71、1.97、2.03mg·kg-1鲜组织。上述结果表明,养殖与野生胡子鲶体色的差异主要来源于食物中叶黄素含量的不同,在饲料中添加叶黄素类产品可有效改善养殖胡子鲶体色,叶黄素适宜添加量建议为100mg·kg-1饲料(成鱼)或50mg·kg-1饲料(鱼种)。  相似文献   

8.
体长、体重、体高是鱼类的重要生物学指标,而性腺重是衡量鱼类繁殖性能的重要参数。本试验主要研究的是彭泽鲫(♀)繁殖季节其体长、体重、体高,哪个指标与性腺重更具有相关性,从而更能体现卵巢的发育程度,达到在选种过程中更具有针对性的目的。实验通过对实验鱼的体重、体高、体长和性腺重进行测定,然后应用生物统计学原理进行相关性的分析,最后得出结论。结论表明在彭泽鲫的生长过程中,体长、体高、体重与性腺重相关性都极显著。  相似文献   

9.
鲤头长、体厚、体高性状的QTL定位及遗传效应分析   总被引:2,自引:2,他引:0  
用174个SSR、41个EST、345个SNP标记对以镜鲤良种后代为祖父母本所培育的杂交F2群体的68个个体进行基因型检测,运用JoinMap4.0软件包构建遗传连锁图。利用MapQTL5.0区间作图法(interval mapping,IM)和多QTL区间定位法(MQM mapping,MQM)进行QTL检测,通过置换实验(1000次重复)确定连锁群显著性水平阈值。在对体高、头长、体厚的区间定位中,共检测到6个与体高性状相关的QTLs区间,分布在LG1(SNP1339-SNP1490)、LG10(HLJE469-SNP1491)、LG12(SNP0922-HLJ1316)、LG13(SNP0937-HLJ328)、LG25(SNP1041-HLJ594)、LG35(SNP1425-SNP0389)等6个连锁群上,解释表型变异范围为20.0%~43.3%。其中,SNP1339-SNP1490区间LOD值最大为3.64,解释表型变异35.4%。6个与头长相关的QTLs,分布在LG1(SNP1339-SNP1490)、LG12(HLJ071-HLJ336)、LG13(SNP0937-HLJ328)、LG24(SN...  相似文献   

10.
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