التغيرات السنوية في نشاط مبايض سمكة الكارب الاعتيادي Cyprinus carpio L. في هور الحمار -جنوب العراق

الملخص EN

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 and September.

The averages of GSI values varied from 0.96-2.20.

Developing and Maturing stage ; it was presented in October, December, January and 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 and May, with an G.S.I values varied from 3.49- 5.19.

Post spawning stage ; it was presented in June and 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.