Challenges of genetic homogeneity in aquaculture of the kelp Saccharina japonica: Insights from China in ten year’s retrospect
Genetic homogeneity among principal cultivars of the kelp Saccharina japonica was first documented a decade ago in Rongcheng, a historically significant Saccharina farming city in China. Seven large-scale hatcheries in this region supply seedlings for approximately 50,795 ha of cultivation area, yie...
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Elsevier
2025-09-01
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| Series: | Aquaculture Reports |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S235251342500290X |
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| author | Xiaodong Li Lirong Chang Feng Han Xia Li Luyang Xiao Ershuai Huang Yaning Yang Li Su Shaojun Pang |
| author_facet | Xiaodong Li Lirong Chang Feng Han Xia Li Luyang Xiao Ershuai Huang Yaning Yang Li Su Shaojun Pang |
| author_sort | Xiaodong Li |
| collection | DOAJ |
| description | Genetic homogeneity among principal cultivars of the kelp Saccharina japonica was first documented a decade ago in Rongcheng, a historically significant Saccharina farming city in China. Seven large-scale hatcheries in this region supply seedlings for approximately 50,795 ha of cultivation area, yielding ∼2.7 million metric tons of fresh biomass annually. These hatcheries have implemented independent breeding programs to enhance the productivity of cultivated populations. To assess decadal changes in farmed populations, we conducted a comprehensive investigation during the 2023–2024 cultivation cycle, combining microsatellite marker analysis of genetic composition/structure with open-sea cultivation trials to evaluate both genotypic and phenotypic characteristics. Our analyses confirmed persistent genetic homogeneity in five of six examined cultivars, consistent with prior findings. Standardized parental sporophyte selection criteria, coupled with uniform hatchery protocols and infrastructure, were identified as primary drivers of homogeneity. Notably, genetic introgression was detected in 2024 populations following the introduction of a hybrid cultivar developed through targeted hybridization at one hatchery. The incorporation of phylogenetically distinct germplasm induced measurable genotypic and phenotypic modifications in farmed populations, concomitant with productivity improvements. These findings underscore the necessity for hatcheries to maintain self-sustaining broodstock management and seedling production systems to preserve cultivar genetic integrity in a multi-hatchery operation environment. Regular monitoring of population genetic architecture is strongly recommended to ensure sustainable aquaculture practices. |
| format | Article |
| id | doaj-art-fd49c69891de4f1c93b69f636d24e536 |
| institution | Kabale University |
| issn | 2352-5134 |
| language | English |
| publishDate | 2025-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Aquaculture Reports |
| spelling | doaj-art-fd49c69891de4f1c93b69f636d24e5362025-08-20T03:45:12ZengElsevierAquaculture Reports2352-51342025-09-014310290410.1016/j.aqrep.2025.102904Challenges of genetic homogeneity in aquaculture of the kelp Saccharina japonica: Insights from China in ten year’s retrospectXiaodong Li0Lirong Chang1Feng Han2Xia Li3Luyang Xiao4Ershuai Huang5Yaning Yang6Li Su7Shaojun Pang8Key Laboratory of Breeding Biotechnology and Sustainable Aquaculture (CAS), Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China; Laboratory for Marine Biology and Biotechnology, Qingdao Marine Science and Technology Center, Qingdao, ChinaWeihai Changqing Ocean Science & Technology Co., Ltd., Weihai, ChinaNational Fisheries Technology Extension Center, Beijing, ChinaXinghuacun Fenjiu Distillery Co., Ltd., Fenyang, ChinaWeihai Changqing Ocean Science & Technology Co., Ltd., Weihai, ChinaWeihai Changqing Ocean Science & Technology Co., Ltd., Weihai, ChinaKey Laboratory of Breeding Biotechnology and Sustainable Aquaculture (CAS), Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China; Laboratory for Marine Biology and Biotechnology, Qingdao Marine Science and Technology Center, Qingdao, China; University of Chinese Academy of Sciences, Beijing, ChinaKey Laboratory of Breeding Biotechnology and Sustainable Aquaculture (CAS), Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China; Laboratory for Marine Biology and Biotechnology, Qingdao Marine Science and Technology Center, Qingdao, ChinaKey Laboratory of Breeding Biotechnology and Sustainable Aquaculture (CAS), Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China; Laboratory for Marine Biology and Biotechnology, Qingdao Marine Science and Technology Center, Qingdao, China; Corresponding author at: Key Laboratory of Breeding Biotechnology and Sustainable Aquaculture (CAS), Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China.Genetic homogeneity among principal cultivars of the kelp Saccharina japonica was first documented a decade ago in Rongcheng, a historically significant Saccharina farming city in China. Seven large-scale hatcheries in this region supply seedlings for approximately 50,795 ha of cultivation area, yielding ∼2.7 million metric tons of fresh biomass annually. These hatcheries have implemented independent breeding programs to enhance the productivity of cultivated populations. To assess decadal changes in farmed populations, we conducted a comprehensive investigation during the 2023–2024 cultivation cycle, combining microsatellite marker analysis of genetic composition/structure with open-sea cultivation trials to evaluate both genotypic and phenotypic characteristics. Our analyses confirmed persistent genetic homogeneity in five of six examined cultivars, consistent with prior findings. Standardized parental sporophyte selection criteria, coupled with uniform hatchery protocols and infrastructure, were identified as primary drivers of homogeneity. Notably, genetic introgression was detected in 2024 populations following the introduction of a hybrid cultivar developed through targeted hybridization at one hatchery. The incorporation of phylogenetically distinct germplasm induced measurable genotypic and phenotypic modifications in farmed populations, concomitant with productivity improvements. These findings underscore the necessity for hatcheries to maintain self-sustaining broodstock management and seedling production systems to preserve cultivar genetic integrity in a multi-hatchery operation environment. Regular monitoring of population genetic architecture is strongly recommended to ensure sustainable aquaculture practices.http://www.sciencedirect.com/science/article/pii/S235251342500290XSaccharina japonicaKelp farmingSeaweed aquacultureGene introgressionProductivity |
| spellingShingle | Xiaodong Li Lirong Chang Feng Han Xia Li Luyang Xiao Ershuai Huang Yaning Yang Li Su Shaojun Pang Challenges of genetic homogeneity in aquaculture of the kelp Saccharina japonica: Insights from China in ten year’s retrospect Aquaculture Reports Saccharina japonica Kelp farming Seaweed aquaculture Gene introgression Productivity |
| title | Challenges of genetic homogeneity in aquaculture of the kelp Saccharina japonica: Insights from China in ten year’s retrospect |
| title_full | Challenges of genetic homogeneity in aquaculture of the kelp Saccharina japonica: Insights from China in ten year’s retrospect |
| title_fullStr | Challenges of genetic homogeneity in aquaculture of the kelp Saccharina japonica: Insights from China in ten year’s retrospect |
| title_full_unstemmed | Challenges of genetic homogeneity in aquaculture of the kelp Saccharina japonica: Insights from China in ten year’s retrospect |
| title_short | Challenges of genetic homogeneity in aquaculture of the kelp Saccharina japonica: Insights from China in ten year’s retrospect |
| title_sort | challenges of genetic homogeneity in aquaculture of the kelp saccharina japonica insights from china in ten year s retrospect |
| topic | Saccharina japonica Kelp farming Seaweed aquaculture Gene introgression Productivity |
| url | http://www.sciencedirect.com/science/article/pii/S235251342500290X |
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