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April 12, 2012
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December 20, 2012
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Abstract

Uttarakhand is considered as one of the freshwater fish biodiversity zone within India and the aquatic biodiversity here is threatened primarily due to anthropogenic activity and introduction of non-native fishes.  Colonization and invasion of new aquatic habitats are common in nature as a result of climatic or geotectonic events but humans provide additional artificial pathways by which introduced non-native fishes can overcome biogeographic barriers. Here, in this paper, we assessed the i) factors assisting establishment of introduced brown trout’s (Salmo-trutta) population in river Asiganga and other fresh water systems in district Uttarakashi, ii) attributes of brown trout’s dietary habits that are helping them establish their population by analyzing the stomach contents of brown trout and, iii) food preferences of brown trout. As evident from our studies it is found that fish fingerlings is the food of choice and based on the morphometric assessment most of these fingerlings being preferred as food are that of an endemic species Schizothorax.  Brown trout does eat benthos but Selectivity Index data suggest that these benthos are not a preference but lie in the neutral zone as most of the values are between -0.25 to 0.25. Different feeding preferences and reduced water level in pockets of rivers for long distance migration, seems to be major factor in establishment and spread of brown trout which in turn is threatening the endemic fish species of Uttarakhand.   

Keywords

endemic species Asiganga brown trout feeding habits

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Thapliyal, M., Barthwal, M., Chandra, T., Bahuguna, S. ., Bhatt, J., & Thapliyal , A. (2012). Establishment of population of introduced brown trout (Salmo trutta) co-related to their feeding habits in river Asiganga, district Uttarkashi, Uttarakhand. Environment Conservation Journal, 13(3), 15–21. https://doi.org/10.36953/ECJ.2012.130303
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