Mohammad Hossein Khanjani; Omidvar Farhadian; Yazdan Keivany; Eisa Ebrahimi
Volume 12, Issue 1 , April 2013, , Pages 67-76
Abstract
The most important factors controlling cladocerans production, growth, and morphometric characters are temperature, food quantity and quality and photoperiod. Effects of temperature and photoperiod on production, and morphometric characters of cladoceran, Ceriodaphnia quadrangular, were examined by culturing ...
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The most important factors controlling cladocerans production, growth, and morphometric characters are temperature, food quantity and quality and photoperiod. Effects of temperature and photoperiod on production, and morphometric characters of cladoceran, Ceriodaphnia quadrangular, were examined by culturing on green algae Scenedesmus quadricauda in 250 ml conical flasks (150 ml water). Treatments used for temperature (˚C)and photoperiod (light hours:dark hours) were 20,25,30 (˚C) and 12:12,24:0 and 0:24, respectively. The maximum population density (5.51 ind./ml) obtained at 24:0 and 30 (˚C), while maximum body length (731 µm) and maximum body width (491 µm) obtained at 0:24 and 20 (˚C). Correspondingly, the maximum adult (61 %), maximum neonate (39 %) and young (9 %) in population under culture conditions of 0:24, 12:12,24:0 (L: D) and 20 (˚C) obtained, respectively. Overall, this research showed that growth and reproduction of Ceriodaphniaquadrangula gave better performance at 25 (˚C)and 24:0, light: dark photoperiod.
Eisa Ebrahimi; Razia Tangestani; Ebrahim Alizade; Parviz Zare
Volume 11, Issue 4 , March 2013, , Pages 1-12
Abstract
The effect of garlic essential oil (garlic essence) as an growth promoter, on growth, feeding indices and chemical body composition were investigated in juveniles of reared beluga (Huso huso). Six diets (one diet without garlic essential oil and antibiotic as in control diet, one diet with 30 mg/kg Oxytetracycline ...
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The effect of garlic essential oil (garlic essence) as an growth promoter, on growth, feeding indices and chemical body composition were investigated in juveniles of reared beluga (Huso huso). Six diets (one diet without garlic essential oil and antibiotic as in control diet, one diet with 30 mg/kg Oxytetracycline antibiotic and four diets with 50, 100, 150 and 200 mg/kg garlic essence) were prepared. Juveniles of reared beluga with averaged weight 24±1.50 g were fed with these diets for 8 weeks. The Final Weight (FW) and percentage increase in Body Weight (BWI), Protein Efficiency Ratio (PER), Protein Production Ratio (PPR) and Protein level of Chemical body composition wear significantly higher in diet with 150 mg/kg garlic essences while, the Food Conversion Ratio (FCR) was significantly lower. This treatment was significantly (P<0.05) better than other treatments. In conclusion, adding 150mg/kg garlic essential oil to beluga juveniles diet, is proposed to improve Growth Performance, Feeding indices and Chemical body composition.