في هور الحمار- جنوب العراقCyprinus carpio L. التغيرات السنوية في نشاط مبايض سمكت الكارب الاعتيادي

Abstract

The present study includes monitoring the development and maturation in females ovaries
Cyprinus carpio L.Which were collected from Al-Hammar Marsh south Iraq, from July 2006 to
June 2007 , selected environmental factors( such as air and water temperature ,salinity and day
light) were measured in the study area .
Depending on values of the Gonado Somatic index (G.S.I) through out the reproductive
cycle for one year, there are five growth and maturation stages were observed in the ovaries.
namely: Resting stage; it was presented in August & September . The averages of GSI values
varied from 0.96-2.20. Developing & Maturing stage; it was presented in October, December,
January & February. The averages of G.S.I values varied from 3.56-5.45. Prespawning stage; it
was presented in March , with an G.S.I values 12.95 .
Spawning stage; it was presented in April & May , with an G.S.I values varied from 3.49-5.19.
Post spawning stage; it was presented in June & July ,with averages of G.S.I varied from1.92-2.13
The process of oviposition started from April up to May .This indicate that the spawning
period of this species dose not suit the same period of annual prevention 15/2-15/4 ,which is
issued by Ministry of Agriculture . Eggs were released in batches .