The peritoneum exists in vertebrates widely.It is mainly composed of mesothelial cells and formed by a layer of membranous tissue through the support of connective tissue,which has the functions of lubricant, support and protection.Fish have a peritoneum and chromatophores are generally distributed on it.In this stud-y,an expected economic fish Carassius auratus was chosen as the experimental object to study the distribution of peritoneum and the morphological properties of chromatophore by histological methods and to explore the influ-ence of light conditions on the peritoneal chromatophore of C.auratus.The results showed that the peritoneum of C.auratus was black,with apparent distribution on the inner side of the abdominal wall and the side of the trans-verse septum closest to the abdominal cavity.The black peritoneum on the inner side of the abdominal wall ex-tended above the abdominal cavity,enveloping the gonads and connecting to the underside of the swim bladder.The peritoneal melanocytes of C.auratus were black dendritic cells.The paraffin tissue section of the inner perito-neum of the abdominal wall of C.auratus showed that the melanocytes were continuously distributed to form black pigment bands,and the nuclei were oval and blue-purple.Scanning electron microscopy revealed that the peritoneal tissue of C.auratus was uneven and consisted of a polygonal meshwork of cristae.Transmission elec-tron microscopy showed that the peritoneal melanocytes of C.auratus had nuclei and melanosomes,and the mel-anosomes were divided into four periods: Ⅰ,Ⅱ, Ⅲ and Ⅳ.Different illuminations impacted the morphology of the peritoneal melanocytes in C.auratus.The melanocytes in the light group became larger,darker, and had thicker branches, whereas those in the dark group became smaller and had slender branches.This study enri-ches the basic biological parameters of C.Auratus,providing basic data for the protection and utilization of its germplasm resources.On the other hand,it serves as a theoretical reference for studying the fish peritoneal sys-tem.
维普
万方数据
