Showing 2 results for Esmaeili sari
Reza Rajabinezhad , Ghobad Azari Takami , Abbas Esmaeili Sari , Alireza Nikoeian ,
Volume 2, Issue 4 (3-2011)
Abstract
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.
Saeed Yadollahi, Maryam Shapouri, Abolghasem Kamali, Abbas Esmaeili Sari,
Volume 2, Issue 4 (3-2011)
Abstract
Sonbolrood river originates from the springs of Kalij village mountains located in Savadkooh region in geographical situations of N:36" 18' 877 and E: 52" 49' 384, and finally , joins Babolrood river , which is one of input branches of south basin of the Caspian Sea. Geographical situation of this region is N: 36" 20' 15 and E: 50" 24' 550. Sonbolrood River located in Savadkooh region was assessed with the aim of a better understanding of benthic invertebrates' roles in self- biofiltration resulting from sewage entrance. Consequently, 4 stations were selected among 8 stations according to the pre-sampling program. Sampling started in autumn 2009 and ended in summer 2010.Generally, Sonbolrood river benthoses consisted of 3 branches of arthropods and wide worms along with 3 classes, 6 orders and 14 families of mollusca. The maximum diversity and distribution were in autumn and the minimum were in summer at all the stations.The fourth and the third stations showed the maximum and the minimum diversity and distribution. The water quality of Sonbolrood river was assessed for all the stations except station 3 ,based on Hisenov water quality guideline.Sonbolrood river was a wholly decent ecosystem for aquatic organisms due to having an extreme steep, stony-sandy bed and doing self-biofiltration. The increase of organic substances and the sewage of the factory located in an industrial complex at station 3 ,the increase of water contamination resulting from culturing warm-water fish in the soil dam of Sonbolrood river and the entrance of the adjacent village home sewage such as Seyedkala village and Sirdarkala,caused the increase of pollution and trophy of the benthoses resistant to the pollution and influenced on benthic communities.
