التغيرات الفصلية في الغذاء الطبيعي للسمكة الذهبية Carassius Auratus L. في نهر الفرات عند مدينة المسيب-بابل-العراق

الملخص EN

The natural food of golden fish Carassius auratus L.were studied in the Euphrates River at Al-Musayab city during the period from 2/1/2014 to 31/12/2014.

The foregut contents of 295 fish were examined depending on Importance Relative Index (IRI%).

In winter, the results showed that insects came firstly with 19.8%, followed by nondiagnosed digested food (16.7%).

Detritus came firstly in spring by 41% followed by aquatic plants (18 %), in summer, detritus also consisted of the food in the first rank 28.21% followed by non-diagnosed digested food 23.87%.

In autumn detritus also came firstly in 32.1% followed by non-diagnosed digested food 16.9%.

The results indicated that the higher feeding intensity was recorded in spring 30.55 points/fish, while the lowest was 17.69 in autumn.

This fish was more active to feed in spring (95.65%) while the least in winter (88.46%).

It was concluded from the current study that the fish was omnivorous.