The embryonic development of the multiple tetroploid pengze crucian carp

The multiple tetroploid pengze crucian carp was found in the offspring of allogynogenetic pengze crucian carp,and is considered to be very important in both theoretical and practical researches.In order to study the embryonic development and the reproductive mode of the multiple tetroploid pengze crucian carp,the eggs from the multiple tetroploid pengze crucian carp were stimulated by sperms from its maternal parent pengze crucian carp and paternal parent sea carp,respectively.Development of the two kinds of embryos were successively observed and described under Nikon microscope.The main morphological features and the development time of 23 embryonic developmental stages were described from fertilization to hatching.The influences on developmental speed by different water temperature were observed.The differences of embryonic development between the multiple tetroploid pengze crucian carp and the allogynogenetic pengze crucian carp were compared.Based on the above observation,we found that the embryo of multiple tetroploid pengze crucian carp,no matter came from the stimulation of maternal parent's sperm or paternal parent's sperm,showed no obvious differences.The results implied that the multiple tetroploid pengze crucian carp might reproduce by gynogenesis,no matter its egg responded to maternal parent's sperm or to paternal parent's sperm.This result and conclusion are essential different from the phenomena observed in the artificial tetroploid allogynogenetic silver crucian carp.