Document Type : Research Paper
Authors
1
MSc., Department of Fisheries, Faculty of Marine Natural Resources, Khoramshahr Marine Science and Technology University, Iran
2
Assistant Prof., Department of Fisheries, Faculty of Marine Natural Resources, Khoramshahr Marine Science and Technology University, Iran
3
Assistant Prof., Department of Marine Biology, Faculty of Marine Science, Khoramshahr Marine Science and Technology University, Iran
4
Associate Prof., Department of Fisheries, Faculty of Marine Natural Resources, Khoramshahr Marine Science and Technology University, Iran
Abstract
This study was conducted for identifying the feeding indices of Botak fish (Cyprinion macrostomum)
in the Sezar River. Monthly sampling was done from July to December 2011, using pursing net with
different mesh size and gill net with 50 mm mesh size. In total 68 specimens of C. macrostomum were
examined. The results of feeding indices showed that the mean of RLG was 5.33±0.07. Also, the mean
of GI, K, IF and CV were 0.13±0.002, 1.41±0.01, 340.96±20.77 and 5.47, respectively. Based on the
results, Navicula, Cymbella, Diatoma and Nitzschia as main, Microspora, Coconeis, Oscillatoria,
Pediastrum, Rhoicosphenia, Mougeotia, Tribonema, Synedra, Cosmarium, and Spirogyra as subsidiary
and Ulothrix, Gyrosigma, Closterium Scenedesmus, Pinnularia, Gomphonema, Cymatopleura,
Diploneis Oedogonium, and Melosira as an accidental food items were detected. Diet analysis showed
that Cyprinion macrostomum is a priphyton feeder with a RLG of five processing an appropriate
condition factor and feeding condition in the Sezar River.
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