In the families produced by diallel 2 × 2 crosses there were positive relationships in two experimental groups between individual heterozygosity (H0) at four allozyme loci (PGM*,G3PDH*,sMEP*,sMDH−3,4*) and the size of the fish, their morphological variability (10 traits) and the viability among families. An integrativeH0influence on complexes of morphological traits was also obtained. On the basis of factor and discriminant analysis it was shown thatH0correlated with morphological homeostasis at least within one experimental gro