DOI: 10.1016/j.aquaculture.2019.734640
论文题名: A temporal assessment of family composition and genetic diversity in a commercial cohort of Dusky Kob, Argyrosomus japonicus, across the production cycle
作者: Jenkins S.F. ; Ishengoma E. ; Rhode C.
刊名: Aquaculture
ISSN: 448486
出版年: 2020
卷: 516 语种: 英语
英文关键词: Broodstock
; Culling
; Finfish aquaculture
; Parentage analysis
; Selective breeding
; Size grading
Scopus关键词: aquaculture production
; body size
; brood stock
; cohort analysis
; culling
; fish culture
; genetic analysis
; perciform
; selective breeding
; temporal analysis
; Animalia
; Argyrosomus japonicus
; Kobus
英文摘要: The reproductive modes and life history of aquaculture species, such as dusky kob (Argyrosomus japonicus), characterised by high fecundity, mass larval mortality and skewed broodstock spawning success, poses a challenge for the implementation of selective breeding programmes. This often results in inbreeding and the loss of genetic diversity and reduced overall population productivity. These effects might be further exacerbated by standard aquaculture production practices, such as size grading and culling, but this remains under-investigated. In the present study, 14 microsatellite markers were used to monitor changes in genetic diversity and family compositions throughout the production cycle of F1 dusky kob (weaning to marketable size). Overall, the F1 animals experienced a substantial reduction in allelic content and presented statistically significant differentiation from the wild, with a global FST of 0.03 (P < 0.01). Parentage analyses indicated an effective broodstock population size of only seven (out of 12) individuals, with only five full-sib families (from a potential of 16) and three half-sib offspring groups. Two families each had a starting contribution, at weaning, of less than 5%, though neither was eliminated following removal of the smallest animals by grading and culling. Culling, at the final stage, however, did contribute to a significant increase in genetic relatedness in the oldest (i.e. market-sized) group analysed and a single family represented 88% of the resulting stock, suggesting that these individuals were on average faster growing than others. The obtained results demonstrate that culling practices do have the potential to create bias in the representation of families, further complicating the selection of unrelated broodstock candidates in selective breeding programmes. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159946
Appears in Collections: 气候变化与战略
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作者单位: Department of Genetics, Stellenbosch University, South Africa; Department of Biological Sciences, Mkwawa University College of Education, University of Dar es Salaam, Tanzania
Recommended Citation:
Jenkins S.F.,Ishengoma E.,Rhode C.. A temporal assessment of family composition and genetic diversity in a commercial cohort of Dusky Kob, Argyrosomus japonicus, across the production cycle[J]. Aquaculture,2020-01-01,516