Diet and feeding indices of small scale sardeh fish(Capoeta damascina) in Sezar River (Lorestan province)

This study conducted to survey the feeding indices of small scale sardeh fish (C. damascina) in Sezar river of Lorestan Province. Montely sampling was done from Julay to December 2011 and by Purse seine net with different mesh size and gill net with 50 mm mesh size. For diet analysis، 128 number of C. damascina was used. The length and weight of sampled fishes was in renges of 18 to 33 cm and 76 to 519 g، respectively. The average of RLG index was 5. 33±0. 07 that specified the herbivory or prephyton feeder. The mean of gastro- somatic index، condition factor (K)، index of fullness (IF) and vacuity index (CV) was 0. 13± 0. 002، 1. 41± 0. 01، 340. 96±20. 77 and 5. 47، respectively. The genera Navicula، Cymbella، Diatoma and Nitzschia were identified as the main food، the genera Fragillaria، Microspora، Pinnularia، Gomphonema، Oscillatoria، Pediastrum، Rhoicosphenia، Acnanthidium، Tribonema، Melosira، Surirella، Achnanthes، Lyngbya، Scenedesmus as the supplementary food and the genera Ulothrix، Gyrosigma، Spirogyra and Closterium as the incidental food of C. damascina.