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Relationship between natural feeding of Brown trout salmo trutta fario and benthic organisms' biomass in Lar reservoir
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Reza Rajabinezhad   , Ghobad Azari Takami , Abbas Esmaeili sari , AliReza Nikoeian |
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Abstract: (7623 Views) |
| In this Study, 186 pieces of Brown trout, salmo trutta fario were captured monthly from June to December 2005 with drift gill net from the Lar reservoir. The age of samples varied between 2 to 5 years with a mean of 3.0 ± 0.7. Average of fork length and weight respectively were 27.5 ± 6.0 cm and 235.1 ± 124.0 gr. Index of fullness average was 148.2 ± 85.9 that indicates an undesirable status of fish feeding. Average of relative length of gut was 0.47 ± 0.08 and condition factor were determined 0.91 ± 0.14. Gut contents of Brown trout in this lake included Daphniidae, Chironomidae and Cytheridae families with following percentages respectively 63/970, 17/981 and 13/034 which were the main preys of the fish. Although Tubificidae with 77.12% were the most frequent benthos organisms but their frequency in the digestive system of fish was 0.002% which showed fish reluctancy for consuming them. In addition to cannibalism, a wide range of macrobenthic invertebrates including aquatic insects, terrestrial organisms and mollusks of the Limnaeidae family were identified in fish diet.
The results of this research indicated that Brown trout consumed a wide range of organisms belonging to the river ecosystem in addition to lake organisms in their natural diet that was due to frequent movement of fish between two ecosystems. |
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| Keywords: Brown trout, salmo trutta fario, gut contents, Index of fullness, Benthos biomass, Lar reservoir, Iran |
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Full-Text [PDF 1123 kb]
(2842 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2014/01/31 | Accepted: 2014/01/31 | Published: 2014/01/31
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