Successful crossbreeding between Oreochromis niloticus and Sarotherodon melanotheron to produce a commercial hybrid has been *** karyotypes and isoenzyme of these two species and their reciprocal hybrids（*** ♀ ×...
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Successful crossbreeding between Oreochromis niloticus and Sarotherodon melanotheron to produce a commercial hybrid has been *** karyotypes and isoenzyme of these two species and their reciprocal hybrids（*** ♀ × *** ♂,*** ♀ × *** ♂,the last not included in the isoenzyme study） were investigated via metaphase chromosomes obtained from head kidney cells and electropherogram of lactate dehydrogenase（LDH） isoenzymes from the liver,kidney,white muscle,heart,and eye *** diploid chromosome number（2n=44） and the fundamental number（NF=50） of the four tilapia genotypes were the ***,the karyotype of *** had three pairs of sub-metacentric（sm）,twelve pairs of sub-telocentric（st）,and seven pairs of telocentric（t） chromosomes,while *** had one pair of metacentric（m）,two pairs of sm,12 pairs of st,and seven pairs of t *** reciprocal hybrids both showed a mixed karyotype range between their parents：0.5 pair of m,2.5 pairs of sm,12 pairs of st,and seven pairs of t *** view of the electropherogram of isozymes,only the LDH of the kidney showed significant clear bands,with five bands in ***,three bands in ***,and duplicated six bands in the *** bands varied depending on their activities and *** considered that the differences in karyotype and isoenzyme were related to the genetic mechanism for post-mating isolation,and provided some additional basic genetic background of their taxonomy.
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