Correlation between morphometric trait and any of body weight and net body weight of adult Misgurnus anguillicaudatus
[Objective]In order to provide theoretical basis for artificial breeding of loach,the correlations between morphometric traits and any of body weight and net weight of adult Misgumus anguillicaudatus were studied.[Method]A total of 120 12-month-old M.anguillicaudatus individuals were randomly sampled from pond for experiment.Their body weight(BW),net weight(NW),total length(X1),body length(X2),snout-vent length(X3),postanus length(X4),periproct (X5),anal body height(X6),anal body breadth(X7),head length(X8),head height(X9),head breadth(X10),interorbital space(X11),nasal space (X12),trunk length(X13),body depth (X14),body breadth(X15),caudal peduncle length (X16),caudal peduncle height(X17),dorsal fin girth(X18),body height on dorsal fin(X19),snout length(X20),predorsal length (X21) were measured.Then,the effect of these morphological traits on body weight and net weight was studied through correlation analysis,path analysis and multiple regression analysis.[Result]All correlation coefficients between phenotyoic traits and any of body weight and net weight were at extremely significant level(P<0.01).The path analysis showed that,the total determination coefficients of three selected morphological traits(X,,X19,X20) to body weight and net body weight were 0.863 and 0.866,respectively,but the body height on dorsal fin(X19) had the largest direct effect on body weight and net body weight,the corresponding path coefficients were 0.490 and 0.487,respectively.The total length(X1) had the largest indirect effect on body weight and net body weight,the corresponding path coefficients were 0.361 and 0.357,respectively.Multiple regression equations of selected morphological traits with body weight and net weight were established,as follows:BW=0.103X1+0.745X19+0.279X20-10.092 and NW=0.104X1+0.783X19+0.269X20-17.115,respectively.[Conclusion]Body height on dorsal fin can be regarded as core trait,while total length can be regarded as relative important trait in loach breeding.
Misgurnus anguillicaudatusmorphological traitbody weightnet body weightpath analysismultiple regression analysis