supported by the National Natural Science Foundation of China(Grant No.30330480);the State Key Basic Research Project of China(abbreviate:973 Project)(Grant No.2001CB109006);the Doctoral Station of University of the Education Ministry of China(Grant No.200405422001).
The histological and ultra-structure of the pituitary in diploid red crucian carp(Carassius auratus red var.),triploid crucian carp and allotetraploid hybrids within and after the breeding season were comparatively st...