تأثیرات دفعات غذادهی در شاخص‌های رشد، تغذیه و ترکیبات بیوشیمیایی ماهی استرلیاد (Acipenser ruthenus

نوع مقاله: مقاله پژوهشی

نویسندگان

1 . کارشناس ارشد، گروه شیلات، دانشکدة منابع طبیعی دریا، دانشگاه علوم و فنون دریایی

2 . استادیار گروه شیلات، دانشکدة منابع طبیعی دریا، دانشگاه علوم و فنون دریایی خرمشهر.

3 . دانشیار گروه شیلات، دانشکدة منابع طبیعی دریا، دانشگاه علوم و فنون دریایی خرمشهر

چکیده

مطالعة حاضر با هدف بررسی تأثیرات دفعات غذادهی مختلف در شاخص‌های رشد، تغذیه و ترکیبات بیوشیمیایی ماهی استرلیاد (ruthenusAcipenser) طراحی شده است. به این منظور تعداد 150 قطعه ماهی استرلیاد با متوسط وزن اولیة 1±50 گرم انتخاب و در 15 تانک تقسیم‌بندی شدند. ماهی‌ها 2 بار در روز (تیمار 1)، 3 بار در روز (تیمار 2)، 4 بار در روز (تیمار 3)، 5 بار در روز (تیمار 4) و 6 بار در روز (تیمار 5) به میزان 3 درصد وزن تر بدن به مدت 60 روز غذادهی شدند. نتایج نشان می‌دهد که اختلاف معنی‌داری (05/0P<) در شاخص‌های رشد با دفعات غذادهی مختلف به استثنای ضریب چاقی وجود دارد. بر اساس نتایج، بهترین میزان شاخص‌های رشد در تیمار 5 وعده غذادهی در روز مشاهده شد. ضریب تبدیل غذایی، بازده غذایی، درصد مصرف خالص پروتئین و چربی به طور معنی‌داری تحت تأثیر دفعات مختلف غذادهی قرار دارند. افزایش تعداد دفعات غذادهی تا 5 نوبت موجب بهبود شاخص‌های تغذیه‌ای در این گونه شد. مقایسة آماری ترکیبات بیوشیمیایی در دفعات غذادهی مختلف فقط اختلاف معنی‌داری (05/0P<) را در محتوای پروتئین و چربی خام بدن نشان داد. بنا بر نتایج این تحقیق می‌توان بیان کرد که بهترین نتایج در عملکرد رشد و تغذیه در تیمار 4 مشاهده شد، بنابراین برای تغذیة ماهی استرلیاد 5 وعده غذادهی در روز پیشنهاد می‌شود.
 
 
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effect of feed frequency on growth performances, feed utilization and biochemical composition of sterlet sturgeon, Acipenser ruthenus

نویسندگان [English]

  • Leila Kochaki 1
  • Mohammad Zakeri 2
  • Seyed Mohammad Mousavi 2
  • Vahid Yavari 3
  • Preeta Kochanian 3
1 M.S. student, Department of Fisheries, Faculty of Marine Natural Resources, Khorramshahr University of Marine Science and Technology, Iran
2 Assistant Professor, Department of Fisheries, Faculty of Marine Natural Resources, Khorramshahr University of Marine Science and Technology, Iran
3 Associated Professor, Department of Fisheries, Faculty of Marine Natural Resources, Khorramshahr University of Marine Science and Technology, Iran
چکیده [English]

The effect of feeding frequency on growth performance, feed consumption and body biochemical composition of Acipenser ruthenus juveniles was investigated. The trial was performed using 150 fish with a mean initial weight of 50±1 g randomly introduced in fifteen tanks. Fishes were fed at a feeding frequency of twice daily (T1), three times a day (T2), four times a day (T3), five times a day (T4) and six times a day (T5) at the rate of 3 percentage of wet body weight for 60 days. There was a significant difference (P< 0.05) in fish growth performance between the feeding frequencies except condition factor. The best growth rate was observed in the treatment where fish were fed five times a day. Food conversion ratio, feed efficiency ratio, net protein utilization and net lipid utilization were significantly affected by different feeding frequencies. Increased feeding frequency showed an improvement in nutritional indicators. A statistical comparison of the biochemical composition revealed a significant difference (P<0.05) in crude protein and lipid among treatments, but none specifically (P>0.05), in ash content. Based on the results of this study, five meals per day (T4) is recommended for juvenile sterlet sturgeon feeding.
 
 
 

کلیدواژه‌ها [English]

  • Acipenser ruthenus
  • feeding frequency
  • Growth
  • feed conversion
  • Body biochemical composition
 

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