Morphological Study Of Early Allometric Growth,Sexual Dimorphism,Pharyngeal Bones Of Carassius Auratus In Qihe River

Carassius auratus in Qihe River belong to Cyprinidae,Cyprininae,Carassius,Carassius auratus gibelio.It's natural triploidy gynogenesis crucian,which is produced in Qihe River,Hebi City,Henan Province.It's not only unique quality precious species in Henan Province,but also key protected rare and endangered wild animals.Because Carassius auratus in Qihe River was provided with fast growth rate,delicious taste and economic high growth,which made it become the research focus of many scholars.In this thesis,we use empirical morphometry and statistical analysis comprehensively to study the early development and allometric growth patterns,adult sexual dimorphism and morphological description of pharyngeal bone and pharyngeal teeth of Carassius auratus in Qihe River.The purpose of study is to supplementary current morphological research materials of Carassius auratus in Qihe River,fill a gap which has hitherto existed in early development and allometric growth patterns.This provides the foundation material for morphological research,identification of germplasm resources and breeding protection.1.The study the early development ofCarassius auratus in Qihe RiverThe measured data were analyzed by SPSS version 20.0 for Windows statistical software.Descriptive statistics analysis and regression analysis were used to study growth characteristics and mechanism of the allometric growth law of Carassius auratus in Qihe River.The results showed that the relationship total length,body height,body width,head length and head width with day-old was fitting power exponential model(P<0.05).The early growth of each morphological variable showed typical characteristics of allometric growth.2.Sexual dimorphism of Carassius auratus in Qihe RiverThe covariance analysis,multivariate discriminant analysis and factor analysis of different dependent variables were used to investigate sexual dimorphism of Carassius auratus in Qihe River.There were significant differences(P<0.05 or 0.01)of 7 variables(body height,body width,head length,snout length,eye diameter,the length of the back of the eye and tail stem caudal peduncle length)among the 14 variables.The females had significantly larger body length than the males did,while males had significantly longer length of caudal peduncle and height of caudal peduncle than females did.Factor analysis showed that 3 factors could be extracted from 13 morphological variables.They could explain 72.5% of the total variation of the original variables.The discriminant analysis was high,with overall classification accuracies ranging from 80.4% to 86.3%.Accuracies created by cross-validation were slightly lower than the original sample test,ranging from 76.5% to 78.4%.3.Morphology of pharyngeal bone and teeth of Carassius auratus in Qihe RiverShape composition of pharyngeal bone and teeth of Carassius auratus in Qihe River were observed and described.One-way ANOVA and PCA were used to analysis the sexual dimorphism between pharyngeal teeth and body size.The result showed that there was no significant difference in sexual dimorphism between males and females for the variables of pharyngeal bone and variables of ratios(P<0.05),with morphology variables being smaller for males than for females.The result from PCA showed that seven variables of pharyngeal bone are extracted four factors that explained 88.45% of the variance of the original variables.Compared to sex determination of pharyngeal bone,there were significant sex differences in the variables of external morphology.Few factors which were extracted from pharyngeal bone could be explained by independent variables.