| 摘要: |
| 缢蛏(Sinonovacula constricta)是我国重要的水产经济贝类,开展耐高盐新品种选育对平衡不同地区缢蛏良种养殖意义重大。本研究对不同家系缢蛏幼贝进行高盐胁迫,运用统计学方法和相关性分析探究了缢蛏耐高盐性能及其与生长性状的相关性。结果显示,缢蛏家系间壳长、壳高、壳宽和体质量表型值差异较大,体质量变异系数达15.53%。不同家系对高盐耐受性差异较大,家系间死亡率范围在0~100%。胁迫实验共持续9d,各家系缢蛏首粒死亡时间在第1~9d之间,而且死亡率较高的家系内缢蛏死亡时间离散程度较大,说明不同个体间高盐耐受性差异也较大。缢蛏开始出现大量死亡的时间主要在胁迫后第8d,第9d部分家系死亡率高于80%,说明缢蛏对高盐耐受存在一个阈值,超过该阈值会开始或大量死亡。皮尔逊和斯皮尔曼相关性分析显示,缢蛏存活时间和生长性状为正相关,其中存活时间与缢蛏壳长、体质量相关性均达到显著水平(P<0.05)。缢蛏存活率与体质量、生长速度均显著正相关(P<0.05)。整体而言,壳长较长和体质量较重的缢蛏个体耐高盐性能较强,在高盐环境中具有生长优势。本研究揭示了缢蛏的高盐耐受性及其与生长性状的相关性,为缢蛏耐高盐选育工作提供了重要的参考依据。 |
| 关键词: 缢蛏(Sinonovacula constricta) 耐盐性 生长性能 相关性分析 |
| DOI：10.11759/hykx20210928004 |
| 分类号:S968 |
| 基金项目:国家重点研发计划“蓝色粮仓科技创新”专项项目(2019YFD0900400) |
|
| Correlation between high salt tolerance and growth performance of the razor clam Sinonovacula constricta |
|
CHEN Yi-hua1,2, NIU Dong-hong1,3, DONG Zhi-guo2, LI Jia-le1,3
|
|
1.Shanghai Collaborative Innovation Center for Cultivating Elite Breeds and Green-culture of Aquaculture animals, Shanghai 201306, China;2.Jiangsu Key Laboratory of Marine Biotechnology, Jiangsu Ocean University, Lianyungang 222005, China;3.Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China
|
| Abstract: |
| The razor clam, Sinonovacula constricta, is an aquatic species of economic importance in China. Breeding for a new razor clam variety with improved salt tolerance can balance the yield of clams in different regions. In this study, the young razor clams from different families with a 2.67±0.38-cm mean shell length and 1.48±0.26-g mean body weight were used for the high salt stress experiment. Data were tested for correlation between high salt tolerance and growth performance of razor clams. The results showed that there was a wide variation in the phenotypic values of shell length, shell height, shell width, and body weight among different families. The coefficient of variation of body weight was 15.53%. The mortality among different families ranged from 0% to 100%, indicating that tolerance to high salt stress differed among the families. The family with the highest mortality had a large degree of variation in time to death, which indicated that there were great differences in high salt tolerance among individuals within the family. The stress experiment lasted for 9 days, and the razor clams died in large numbers on the 8th day. This showed that there was a threshold for high salt tolerance in razor clams. Pearson and Spearman correlation analysis showed that the survival time of the razor clam was significantly and positively correlated with shell length and body weight (P <0.05). The survival rate of razor clams in each family was significantly and positively correlated with body weight and specific growth rate (P <0.05). Overall, razor clams with longer shell lengths and heavier body weights were more tolerant to high salt stress and had a higher growth rate in the high salt environment. This study provides a baseline for the selection and breeding of the razor clam for high salt tolerance. |
| Key words: Sinonovacula constricta high salt tolerance growth performance correlation analysis |
