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| Heritability Assessment of High Temperature Tolerance Traits in Juvenile Pacific White Shrimp Litopenaeus vannamei |
| QU Min1,2, TAN Jian2,3, LUAN Sheng2,3, QIANG Guangfeng2,3, LUO Kun2,3, SUI Juan2,3, MENG Xianhong2,3, KONG Jie2,3 |
1. College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, China;
2. Key Laboratory of Marine Fisheries Sustainable Development, Ministry of Agriculture and Rural Affairs, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China;
3. Functional Laboratory of Marine Fishery Science and Food Production Processes, Qingdao Pilot National Laboratory of Marine Science and Technology, Qingdao 266071, China |
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Abstract In order to study the effects of high temperature on genetic variation of Pacific white shrimp Litopenaeus vannamei, 40 full-sibling families were randomly selected from the 4 populations of Pacific white shrimp (EGDB, PRMA, API, and SIS) that were introduced from abroad in 2018, and 100 individuals were randomly selected from each family, divided into two parts and reared to P21—P23 in the designated test barrels. The test barrels were heated using a water bath heating method and its corresponding survival time and temperature were recorded. A single character animal model was used to evaluate the genetic parameters of its heat resistance. The results showed that the heat resistance values of larvae of each family were ranged from 782.64 to 2074.33 ℃·h, indicating that there were significant differences in heat resistance among Pacific white shrimp larvae. The coefficient of variation of heat resistance between families was ranged from 10% to 68%, and the cumulative survival rate of each line was ranged from 58% to 99% at water temperature increasing from 28 ℃ to 40 ℃. The heritability of heat resistance traits in juvenile Pacific white shrimp was estimated to be 0.22±0.05, as medium heritability, by using a single character animal model combined with pedigree information. There was a high level of genetic variation in heat resistance traits of juvenile Pacific white shrimp, and there was a great potential for genetic improvement. The findings can provide data reference for high- temperature culture and breeding of high-temperature resistant strains of Pacific white shrimp in summer.
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Received: 11 November 2021
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