الاختيارية الغذائية لأسماك البياح الأخضر (liza subviridis (valenciennes, 1836

الملخص EN

the food of 68 fish of Liza subviridis from Shatt Al-Basrah canal was studied during the period April – June/ 2009.

The study revealed that the fish tend to be a herbivorous where the animal preys consist 0.19, 2.5% of the food consumed estimated as frequency of occurrence and numeric proportions respectively.

This proportion increased to be 34% when calculated according to the volume of food items.

This fish consumed 25 plant food items and two animal food items.

Coscinodiscus sp.

ranked the first important food item according to the relative importance index while Guinardia sp., Sorerella sp., Cyclotella sp., Gyrosigma sp., Noctiluca sp.

and Naviculla sp.

occupied the next importance in sequence.

Other preys were of less importance.

Ivelev’s selectivity index was applied to determine the food selectivity of this fish and revealed that it prefers Coscinodiscus sp., Guinardia sp., Noctiluca sp.

and Gyrosigma sp.

in sequence of preference.

Other food items were consumed due to scarcity of the preferred food items in the environment.