Mahmoud Mohseni

Effects of Salinity Changes on Hematological Responses in Juvenile Ship Sturgeon Acipenser nudiventris

A 10-day trial was conducted to evaluate the salinity tolerance and hematological responses of juvenile ship sturgeon Acipenser nudiventris under different salinity levels. A total of 240 fish averaging 6.2 ± 0.13 g (mean ± SD) were randomly distributed into 12 tanks in groups of 20, and each tank was then randomly assigned to one of three replicates of four different salinities at 0, 4, 8 and 12‰. At the end of 10 days of experimental period, plasma protein value of fish exposed to 0‰ and 4‰ salinities was signifi cantly higher than those of fish exposed to 8‰ and 12‰ salinities ( P < 0.05). Significantly higher values for plasma cortisol and glucose were obtained in fish exposed to 12‰ salinity compared to the fish exposed to 0‰ and 4‰ salinities ( P < 0.05). Plasma potassium and sodium values increased significantly by increment of salinity levels ( P < 0.05). Therefore, these results indicated that in natural environments, juvenile ship sturgeon, A. nudiventris in migratory populations could be able to migrate and adjust successfully into brackish water with a salinity of up to 8‰ without any short-term hematological stress responses.

Effects of Different Dietary Cadmium Levels on Growth and Tissue Cadmium Content in Juvenile Parrotfish, Oplegnathus fasciatus

This feeding trial was carried out to evaluate the effects of different dietary cadmium levels on growth and tissue cadmium content in juvenile parrotfish, Oplegnathus fasciatus, using cadmium chloride (CdCl2) as the cadmium source. Fifteen fish averaging 5.5±0.06 g (mean±SD) were randomly distributed into each of twenty one rectangular fiber tanks of 30 L capacity. Each tank was then randomly assigned to one of three replicates of seven diets containing 0.30 (C0), 21.0 (C21), 40.7 (C41), 83.5 (C83), 162 (C162), 1,387 (C1,387) and 2,743 (C2,743) mg cadmium/kg diet. At the end of sixteen weeks of feeding trial, weight gain (WG), specific growth rate (SGR) and feed efficiency (FE) of fish fed C21 were significantly higher than those of fish fed C83, C162, C1,387 and C2,743 (p<0.05). Weight gain, SGR and FE of fish fed C0, C21 and C41 were significantly higher than those of fish fed C162, C1,387 and C2,743. Protein efficiency ratio of fish fed C0, C21 and C41 were significantly higher than those of fish fed C1,387 and C2,743. Average survival of fish fed C0, C21, C41 and C162 were significantly higher than that of fish fed C2,743. Tissue cadmium concentrations increased with cadmium content of diets. Cadmium accumulated the most in liver, followed by gill and then muscle. Muscle, gill and liver cadmium concentrations of fish fed C0, C21, C41 and C83 were significantly lower than those of fish fed C162, C1,387 and C2,743. Based on the ANOVA results of growth performance and tissue cadmium concentrations the safe dietary cadmium level could be lower than 40.7 mg Cd/kg diet while the toxic level could be higher than 162 mg Cd/kg diet.

EFFECTS OF VITAMIN E DEFICIENCY ON DIETARY VITAMIN C REQUIREMENT IN SIBERIAN STURGEON (Acipenser baerii)

هديکچ سرزب ی سرا رَظٌه ِب زضاح ی با ی ييهاتیٍ لباقته تازثا C ٍ E اّ صخاض ،ِیذغت ییاراك ،ذضر دزکلوع زب ی ًَخ ی ، ب ي ضَ ي و ي ا یی ، شًآ ی ن اّ ی ذبك ی ّاوسات ِچب یٌویا نتسيس ٍ ی س ي زب ی ( Acipenser baeri ) ضرٍزپ ی ، لیرَتكاف حزط بلاق رد 5 × 2 حازط ی ٍ دزگ ازجا ی ذ زّ ییاذغ ُزيج ُد . ی ک س اب ِ ييهاتیٍ حطس ٍد یَتحه رازکت E ٍ 200 تاتسا مزگ یليه DL لَفزكَت ( TA ) زّ ی ک حطس جٌپ اب 0 ، 100 ، 200،000 ٍ 000 ذيسا مزگَليك زّ رد مزگ یليه L ( کيبرَکسآ AA لکض ِب ُزيج رد ) L ليبرَکسآ 2 تافسفٌَه ( AMP ) .ذًذض ِلَهزف زيج ُ ¬ یاّ كزت ي ب ی ٍ ذقاف ٍُزگ ٍد رد ی هات ي ي E ٍ فلتخه حَطس اب ی هات ي ي C :لهاض E0C0 ، E0 C100 ، E0 C200 ، E0 C400 ٍ E0 C800 ٍاح ٍُزگ ٍ ی 200 ه ي ل ی ييهاتیٍ مزگ E مزگَليك زّ رد ج ي ُز ٍ فلتخه حَطس اب ی هات ي ي C :لهاض E200 C0 ، E200 C100 ، E200 C200 ، E200 C400 ، E200 C800 یحازط داذعت .ذًذض 200 ّاه ِچب دذع ی طسَته ىسٍ اب 66 / 1 ± 0 / 22 مزگ رَطب یٍاسه اّ ذحاٍ رد ی اهسآ ی ط ی سَت ی ع تذه ِب ٍ 12 ج اب ِتفّ ي ُز اّ ی ذغت قَف ی ِ اپ رد .ذًذض ی ىا ُذض بسك ىسٍ ،شرٍزپ ُرٍد ( WG ) ّاه ي ىا ذغت ی ِ ج اب ُذض ي ُز اّ ی E0 C400 ٍ E0 C800 ٌعه رَطب ی راد ی سً ّاه ِب تب ي ىا ذغت ی ِ ُذض E0C0 ٍ E0 C100 دَب زتلااب ( p< 0.05 ) اراك ،ذضر ذًٍر . یی اذغ اّ صخاض ٍ ی ًَخ ی ، ب ي ضَ ي و ي ا یی شًآ ٍ ی ن اّ ی ذبك ی ّاه ِچب ي ىا ذغت ی ِ ٍاح ُذض ی 200 ه ي ل ی ييهاتیٍ مزگ E سا کی زّ رد ييهاتیٍ حَطس C ٌعه فلاتخا ىٍذب ی ٍّزگ ىٍرد راد ی ( p>0.05 ٌعه رَطب ،) ی راد ی ٍ ذقاف ٍُزگ ِب تبسً ی هات ي ي E دَبْب ی ذٌتفا ا. ی ي وّا ُذٌّد ىاطً زها ي ت ب ي زتط ٍ ی هات ي ي E ج ي ُز ٍ ِب تبسً ی هات ي ي C ه ی ه ِچ زگا .ذضاب ي ىاش ٍ ی هات ي ي C ّ ي چ ثات ي ز لٍ ،تضاذً ُذض ِیذغت ىايّاه یگذًاهساب ذصرد زب یراد یٌعه ی ًِاطً ¬ یاّ دَبوك ىآ سا ليبق زيخات ذضر ٍ یب ا ییاْتض رد ىايّاه ِیذغت ُذض یتح د ر ٍ فلتخه حَطس ی هات ي ي E دزگ ُذّاطه ی ذ اتً ِب ِجَت اب . ی ج ييهاتیٍ دَبوك ترَص رد زضاح ِعلاطه

Effects of Photoperiod Manipulation on Growth Performance and Hematological Responses of Juvenile Caspian Roach Rutilus rutilus caspicus

A 8-week trial was conducted to evaluate the effects of photoperiod manipulation on the growth performance and hematological parameters of juvenile Caspian roach, Rutilus rutilus caspicus (average weight 1.46 ± 0.12 g mean±SD) reared under five photoperiods (24 h Light, 24L; 18 h Light & 6 h Dark, 18L:6D; 12 h Light & 12 h Dark, 12L:12D; 6 h Light & 18 h Dark, 6L:18D; 24 h Dark, 24D) with constant light intensity 1,500 lx on the water surface. Triplicate of 20 fish were allocated into each of 15 fiberglass tanks of 50 L capacity and they were fed three times per day with the commercial feed (SFK, Co., Sari Iran) contains 50.0% protein and 10.5% lipid. At the end of experimental period, final body weight, weight gain and specific growth rates of fish exposed to 24L were significantly higher than those of fish exposed to 12L:12D, 6L:18D and 24D (P < 0.05). Red blood cell and hemoglobin of fish exposed to 24L were significantly higher than those of fish exposed to 24D. No significant difference observed in hematocrit, white blood cell and plasma glucose among the different treatments groups. Therefore, these results demonstrated that the growth performance of juvenile Caspian roach can be significantly stimulated by using 24L and 18L:6D photoperiods without any measurable significant stress response such as plasma glucose concentration.