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Production of Induced Gynogenetic Diploid Bagrid Catfish Leiocassis ussuriensis (Siluriformes) - I. Optimization of Treatment Condition for Diploid Gynogenesis  

Park, Sang-Yong (Department of Marine Biotechnology, Soonchunhyang University)
Lee, Yoon-A (Department of Marine Biotechnology, Soonchunhyang University)
Nam, Yoon-Kwon (Department of Aquaculture, Pukyong National University)
Bang, In-Chul (Department of Marine Biotechnology, Soonchunhyang University)
Publication Information
Journal of Aquaculture / v.20, no.3, 2007 , pp. 184-189 More about this Journal
Abstract
Treatment conditions for the induced diploid gynogenesis, a maternal-exclusive form of artificial parthenogenetic reproduction, were optimized in bagrid catfish (Leiocassis ussuriensis, Siluriformes). Optimal amounts of ultraviolet (UV) irradiation for the genetic inactivation of spermatozoa in bagrid catfish and Pseudobagrus fulvidraco were proven to be ranged from 3,600 to 4,800 $ergs/mm^2$ based on the examination of viability of embryos and haploid incidence. Haploid embryos were restored to diploidy by preventing the extrusion of the second polar body using cold shock treatment. Thermal treatments (4 or $6^{\circ}C$ for 30, 40 or 50 min) were carried out 3, 5 or 7 min post insemination. Best scores for embryo viability (38.6% of total eggs taken) and incidence of normal diploidy (87.9% of hatched larvae) were observed at the embryo group treated at $4^{\circ}C$ for 40 min, 5 min after insemination. Restoration of gynogenetic diploidy was confirmed based on the absence of haploid syndrome, cell size and/or nucleolar organizing region (NOR) counts.
Keywords
Bagrid catfish (Leiocassis ussuriensis); Induced gynogenesis; UV-irradiation; Cold shock treatment;
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