جستجوی مقالات مرتبط با کلیدواژه « شاخص های استرس » در نشریات گروه « شیلات »

The aim of this study was to investigate the effects of apple pomace (Malus pumila) derived pectin (APDP) on rainbow trout (Oncorhynchus mykiss). Therefore, 300 rainbow trout with an average weight of 3.56 ± 0.007 were fed diets containing 0.5, 1 and 2% pectin per kg of diet and the control group was fed a diet without pectin for 6 weeks. At the end of the experiment, hematological and biochemical indices were evaluated based on standard formulas and means were analyzed using Tukey test. Based on the results obtained from hematological indices, the treatment fed with 0.5 and 1% of pectin showed the highest levels of hematocrit, hemoglobin and numbers of white blood cells significantly different from those of control treatment (p < 0.05). In terms of other blood indices (erythrocytes, MCV and MCH), no significant difference was found between the experimental treatments and control group (P>0.05). Feeding fish with pectin-containing diets significantly increased albumin index and decreased cholesterol, glucose and cortisol indices (p < 0.05). In case of total protein, globulin and triglyceride, no significant difference was observed between different levels of pectin and control group (P>0.05). Therefore, it can be concluded that the use of pectin in the diet of rainbow trout leads to the improvement of some hematological and biochemical indices

To investigate the effect of anesthetic concentration, time of anesthesia and stage of anesthesia, an experiment was conducted on common carp. Fish were subjected to concentrations 0.7, 1, 2, 3, 4 and 5 g/l clove solution and times of stage 3 and 5 induction were recorded. Immediately after induction, fish were bled and blood levels of cortisol and glucose were determined. At stage 3, cortisol showed correlation only with time, not concentration (R2=0.63). However, glucose showed no correlation with time and/or concentration at this stage. On the other hand, both cortisol and glucose showed strong correlation with both time and concentration at stage 5, which the effect of time was more pronounced and significant than concentration. The obtained models could be used to predict of anesthesia-induced stress under various concentrations of clove solution and different times. The results showed that judgment on the fish behavior could not be a suitable means for induction of anesthesia and start of blood sampling. According to the results, it is suggested that fish should be bled at constant time so that obtained data are not affected by sampling method. Likewise, it is better to use short induction time (less than one min) to suppress anesthesia-induced stress.