Title of article :
Ovarian development of Caspian roach, Rutilus caspicus, in southern Caspian Sea: A histological and ultrastructural study
Author/Authors :
Akhoundian, Maryam Department of Marine science - University of Mazandara , Savari, Ahmad Department of Marine Science - Khorramshahr University of Marine Science and Technology , Salamat, Negin Department of Marine Science - Khorramshahr University of Marine Science and Technology , Movahedinia, Abdolali Department of Marine Science - Khorramshahr University of Marine Science and Technology , Salari, Mohammad Ali Department of Marine Science - Khorramshahr University of Marine Science and Technology
Abstract :
The histology and ultrastructure of the ovarian maturation process in Caspian roach, Rutilus caspicus, was studied. A total 170 female specimens were collected from the Gharasoo River, Bandar Turkmen, the southern Caspian Sea to evaluate its maturation cycle. Based on the results, its ovarian follicle’s development could classified into six stages by distinct characteristics. Minimum and maximum diameter of oocytes were recorded in the chromatin-nucleolus and maturation stages as 56.34±3.74 and 918.83±14.82 µm, respectively. The zona radiata was observed from the cortical alveoli stage and its maximum diameter measured in the secondary vitellogenesis stage as 93.11±23.0 µm. Gonadosomatic index (GSI) reached to its peak in mid-March and its sharp drop in the late April showed its spawning period from late March or early April till the end of April. A positive correlation was found between the GSI and HSI in the vitellogenesis stage. The results also revealed Caspian roach as iteroparous synchronous spawner.
Keywords :
Reproductive cycle , Gonado-somatic indices , Zona radiate , Spawning season
Journal title :
International Journal of Aquatic Biology
