بررسی عادات غذایی، تخمین سطح غذایی و نرخ غذای مصرفی ماهی حسون معمولی (Teleostomi/Synodontidae) در خلیج فارس (استان بوشهر)

In order To increase the knowledge of Saurida tumbil biology and ecology, an investigation of food habits of this species was conducted from October 2010 to September 2011 in Bushehr coastal waters, Persian Gulf. 485 fish stomach contents were studied. In this study the frequency of occurrence of prey, feeding intensity index, the index is empty stomachs, the mean Trophic levels and the rate of food consumption was calculated. Total three major taxonomic categories were identified in the stomach contents of this species and were weighted including arthropods (crustaceans higher crustaceans), mollusks (Cephalopod) and Teleostei and the results show that Teleostei was the most abundant prey item which including the family Carangidae, Nemipteridae, Synodontidae, Mullidae, Sphyraenidae, Leiognathidae , Haemulinae and Trichiuridae. The results showed that the highest intensity of feeding occurs in the fall and lowest in summer. S. tumbil also shows cannibalistic behavior in ecosystem. The mean trophic level for S. tumbil was estimated 4.64 for the first time in Persian Gulf, indicating that S.tumbil is largely carnivore and has a high rate of food consumption.