Comparative histomorphology of cartilage tissue of vertebral column with dorsal fin in Persian sturgeon (Acipenser persicus)

In this study، cartilage tissue of vertebral column and dorsal fin of 40 days، 70 days، one and 4 years old of Persian sturgeon after preparation were fixed in buen fixative. Then rutin procedure of histology examination were done and paraffin blocks cut at 6 microne and then stained with H&E، Safranin-O and Verhoff staining. In photomicrographs were compared cell structure and compounds of substance grounds in cartilage tissues. It showed that perichondrium layer of dorsal fin was more advanced from perichondrium layer of vertebral column and their componants were different. Microscopic masurement of two cartilage tissue showed the cells of dorsal fin were larger than the cells of vertebral column but in cells number،decrised with physiological maturation. Comparative study of volume of extracellular matrix and number of isogenous groups by SPSS software showed that growth of cartilage tissue of vertebral column was interstitial but in dorsal fin was appositional.