بررسي برخي فاكتورهاي زيست شناسي و بافت شناسي گنادها كاكپور معمولي در طي دو فصل پرورش

Study of some biological and histological factors of common carp. Cyprinus carpio, gonad in two culture season

The morphological and histological struture of 52 male and female carps gonads have been studied. The fishes divided to four weight groups: (up to 100, 100-500, 500-1000, 1000-2000 grams) during two culture season. Tissue samples were stained with H & E and PAS Stain. The results showed that gonadosomatic index (GSt) was 4.18, 0.977, 2.033, 3.302 in different groups respectively . The difference between GSI in different groups was significant. Common carp ovary is an asynchronus type because all of stages of oocyte development were observed in same time, characteristics and diameter of oocytes in different groups determined as below: The oocyte diameter range was 9.99 - 33.3µm in chromatin nucleolus stage, 39.75-145.75µm, in perinucleolus stage, 66.25-265 µm in yolk vesicle stage, 304.8-437.3 /