دانلود مقاله Use of Saccharomyces cerevisiae PTTC5052 as a probiotic on growth of rainbow trout (Oncorhynchus mykiss) larvae
سال انتشار: ۱۳۸۷
محل انتشار: اولین کنگره بین المللی مدیریت بهداشتی و بیماریهای آبزیان
تعداد صفحات: ۱
D Zargham – Faculty of Marine Science and Technology, Islamic Azad University, North Tehran Branch, Iran
H Hosseinzadeh Sahhafi – IRANIAN Fisheries Research Institute, Tehran, Iran
M Emtiazjoo – Faculty of Marine Science and Technology, Islamic Azad University, North Tehran Branch, Iran,
T Bashti –
Method & Materials: The yeast (Saccharomyces cerevisiae PTCC5052) was obtained from Iranian Research Organization of Science and Technology (IROST). The weight and length of fries were measured before feeding started. Then, 700 fish were counted per tank. The initial stocking density was 60 larvae per litre. Water flow rate were maintained at approximately 0.5 – 1 litr/min. A 12-h light: 12-h dark photoperiod was maintained and controlled by timers to prepare natural condition to larvae. Each diet was fed to fishes 7 times per day in light hours. Feeding trial was conducted for 7weeks.
Results & Conclusion: Total length, and wet weight were 44.36 mm and 0.786 g, respectively. The spesific growth rate for each treatment was calculated. As result, the SGR for control, treatment A, treatment B, and treatment C, was 3.21, 3.36, 3.34, 3.43, respectively. Condition factor for each treatment was calculated. As result, the CF for control, treatment A, treatment B, and treatment C, was 0.924, 0.902, 0.905, 0.896, respectively. It seems the length enhancement of probiotic treatments was better than weight enhancement, because the condition factor in probiotic treatments is lower than control. Its reason can be found in feeding.