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0.05). In ZarrinGol river males were divided into 3 age classes of 0+ to 2+ and females into 4 age classes of 0+ -3+. In Gomishan lagoon both males and females were categorized in 3 age classes of 0+ to 2+. Age class 1+ was the most abundant class of fish in both sexes and populations. Mean total length (TL) of males and females in ZarrinGol River were 7.5 ± 2 and 8.2 ± 1.7 and 9.7 ± 1.1 and 8.2 ± 1.4 in Gomishan lagoon respectively. Growth pattern in ZarrinGol River was positive alometric for both sexes and isometric in Gomishan lagoon. Condition factor varied in both populations in different months and age classes. Comparison of condition factor for both sexes in two populations showed no significant differences in age class 0+ while there were such differences in age classes of 1+ and 2+. Values of the condition factor were higher in ZarrinGol population. ]]>
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0.05). Treatment group 4 with 1% bile salt had the least amount of fat, 32.52 ± 0.629%, and statistically, it was significantly different from other groups (P<0.05). Also, group 2 with 0.5% bile salts showed the highest and control group with 0% bile salts showed the lowest level of blood cholesterol and triglyceride, and therefore were significantly different from other groups (P< 0.05). Also the total amount of protein, white blood cells, red blood cells, hemoglobin, hematocrit and MCH, MCHC, MCV were significantly different between treatment groups and the control group (P< 0.05).]]>
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0.05). But no significant difference was observed in case of growth performances in second group despite of decreasing in feed intake in bioflocs treatments. Also the results showed that application of biofloc system in intensive carp culture decrease concentration of ammonia, nitrite and nitrate despite of no water exchange (1% daily) in these treatments whiles water was exchanged at a rate approximately every 10 min in control. The results suggest biofloc technology seems to be efficient for intensive farming of common carp.]]>
p. 45−53
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p. 69−78
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0.05). However, growth parameter and feed utilization in group fed with 80% vegetable oil did not exhibited any significant difference compared to the control group (P>0.05).
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p. 125−132
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0.05). The effect of the farms on rivers pH were not significant (p>0.05). TSS in Hasanjoun River was more than Khochireh River (p<0.05) and Khochireh River had less phosphorus contaminant than Hasanjoun River (p<0.05). As a result, the load of organic contaminant in Hasanjoun was more than Khochireh branch (p<0.05). Changes in macrobenthos communities showed that the dominant families were Choronomidae (Diptera order) with 11.6 mean numbers in m2 and Elmidae (Coeloptera order) with 10.0 mean numbers in m2 in the study area. HFBI results based on macrobenthos diversity and density in sampling time showed that presence of Rainbow Trout farm in Khochire caused decreasing in river quality as little as one degree from “Moderate” in station1 to “Fairly poor” in station2. But this fish farm has not effect on Shahroud river main branch, based on no changing in HFBI results on stations3 and 4. The quality of Hasanjoun branch at fish farm upstream was “Bad” because of the presence of population centers in this area. Assimilative capacity of the river cause better condition in water quality at fish farm downstream in this branch as “Moderate” condition. Shahroud river at this area had “Very good” condition on station7 (upstream of Hasanjoun branch in Shahroud) and “Bad” condition on station8 (Downstream of Hasanjoun branch in Shahroud) that is shown the effects of organic pollutants entering from Hasanjoun branch to the Shahroud main branch. Results of physicochemical and biological comparison showed that in the sampling time, the fish farms had not impacts on Shahroud main river branch because of high water volume of this river.
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