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Early Survival and Karyotype of Backcross Bullhead Hybrid between Pseudobagrus fulvidraco Female and P. fulvidraco $\times$ Leiocassis ussuriensis Hybrid Male  

Park, Sang-Yong (Department of Marine Biotechnology, Soonchunhyang University)
Kang, Eun-Jong (Southern Regional Inland Fisheries Research Institute, NFRDI)
Nam, Yoon-Kwon (Department of Aquaculture, Pukyong National University)
Bang, In-Chul (Department of Marine Biotechnology, Soonchunhyang University)
Publication Information
Journal of Aquaculture / v.22, no.1, 2009 , pp. 74-78 More about this Journal
Abstract
Backcross hybridization between Korean bullhead Pseudobagrus fulvidraco female and Korean bullhead P. fulvidraco $\times$ Ussurian bullhead Leiocassis ussuriensis hybrid male was performed, and early viability and karyotype of the backcross hybrids were examined along with their parental species. Mean fertilization rate (86.8%), hatching success (70.7%) and early survival rate (76.4%) of backcross hybrids were similar with those found in the maternal species, the Korean bullhead. From the chromosome analysis, modal chromosome numbers of Korean bullhead, Ussurian bullhead, their hybrid and backcross hybrid were the same as 2n = 52. However, their karyotypes were different among genotypes. The karyotype of backcross hybrid was 22 metacentric + 18 submetacentacentric + 12 acrocentric chromosomes.
Keywords
Backcross hybrid; Pseudobagrus fulvidraco; Leiocassis ussuriensis; Karyotype; Early viability;
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