Activities of digestive enzymes in relation to ingested natural food in three carp species of the Himalayan River Ladhiya,northern India |
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| Authors: | KJ Nilssen MR Ngasainao JG Sharma SK Srivastava S Chandra KS Moirangthem BK Khangembam S Kumar R Chakrabarti |
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| Affiliation: | 1. Department of Biological Science, Norwegian University of Science and Technology, Trondheim, Norway;2. Department of Zoology, Deshbandhu College, University of Delhi, New Delhi, India;3. Department of Biotechnology, Delhi Technological University, New Delhi, India;4. Directorate of Coldwater Fisheries Research, Field Centre, ICAR, Champawat, India;5. Aqua Research Lab, Department of Zoology, University of Delhi, New Delhi, India |
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| Abstract: | The present investigation was carried out to study gut content and accompanying digestive enzyme profiles of the three carp species, golden mahseer Tor putitora, snow trout Schizothorax richardsonii and hill trout Barilius barila. The fishes were captured from the River Ladhiya, Champawat district, Uttarakhand, northern India. The digestive tract length was on average 1.8 and 2.3 times longer than the body, while members of Bacillariophyceae, Chlorophyceae, Cyanophyceae and Zygnematophyceae made up 95.15% and 99.63% of gut content in the golden mahseer and snow trout, respectively. In hill trout, the digestive tract being only half the body length, gut content was insects (72.73%), eggs of aquatic organisms (22.73%) and nematodes (4.55%). Estimated gut enzyme activities demonstrated that amylase activity was significantly (P < 0.05) higher in golden mahseer and snow trout compared to hill trout, while total protease, trypsin and chymotrypsin activities were all significantly (P < 0.05) higher in the hill trout compared to other species. A strong co‐relation was found among relative gut length, food composition and digestive enzyme activities of each species. This may guide the future formulation of feed to these important species of carps kept in farm. |
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| Keywords: |
Barilius barila
digestive enzyme activities natural food
Schizothorax richardsonii
Tor putitora
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