Document Type : Original Manuscript
Authors
1 Department of Biodiversity and Ecosystem Management, Institute of Environmental Sciences Research, Shahid Beheshti University, Tehran, Iran.
2 of Department of Fisheries, Faculty of Marine Science and Technology, University of Hormozgan, Bandar Abbas, Iran.
3 Department of Biodiversity and Ecosystem Management, Environmental Sciences Research Institute, Shahid Beheshti University, Tehran, Iran.
Abstract
A study was conducted to determine food habits brown trout (Salmo trutta), 63 specimen (42 males and 21 females) were caught using an electrofishing in January 2016. The range of total Length for males were 10.3-17.0 cm and for females 10.4-19.3 cm. Weight of males and female were the range of 8.1- 46.1 g and 8.05-76.12 g respectively. After counting and identifying the contents of the stomach, four prey, Trichoptera, Ephemeroptera, Plecoptera and Diptera were identified, with Trichoptera with 37.60% and Diptera with 52.24% having the highest relative frequency. According to Castello, the brown trout 's feeding strategy was general and the predominant prey was Trichoptera, and female specimens use Trichoptera exclusive. The mean Shannon index of male and female were 1.26 and 1.12, respectively, and there was no significant difference between the mean Shannon index of male and female. The mean Evenness index for males and females were 0.95 and 0.81, respectively, but there was no significant difference between the mean Evenness index in male and female. The relative gut Length (RLG) and diet composition of S. trutta suggests carnivore
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