بررسی تاثیر سطوح مختلف اسیدآمینه متیونین بر فاکتورهای رشد و ترکیبات بدن بچه ماهی ازون برون (Acipenser stelatus)

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه شیلات، دانشکده منابع طبیعی و محیط زیست، دانشگاه ملایر، ملایر، ایران

چکیده

متیونین یک اسید آمینه ضروری برای ماهیان بوده که کمبود آن باعث کاهش رشد و کارایی غذا می‌شود. این پژوهش با هدف بررسی اثر افزایش اسید آمینه متیونین بر بهبود عملکرد شاخص‌های رشد و ترکیب بدن بچه ماهی ازون برون (Acipenser stellatus) صورت گرفت. بدین منظور تعداد 200 قطعه بچه ماهی 20 گرمی‌به طور تصادفی در 10 تانک توزیع شدند و دوبار در روز به میزان 4 درصد وزن بدن با جیره‌های غذایی حاوی سطوح مختلف اسید آمینه متیونین (0/5 درصد، 1/5 درصد، 2/5 درصد) در طی 8 هفته تغذیه شدند. شاخص‌های رشد و تغذیه شامل ضریب چاقی، درصد افزایش وزن بدن، ضریب رشد ویژه، ضریب تبدیل غذایی، شاخص وزن بدن، شاخص احشائی و هم چنین ترکیب لاشه بدن ارزیابی شدند. بر اساس نتایج حاصله در بین پارامترهای مورد ارزیابی، به جز ضریب تبدیل غذایی، تفاوت معنی داری بین تیمارهای آزمایشی مختلف مشاهده شد (0/05 <P). بر‌ این اساس، بیش‌ترین میزان عملکرد شاخص‌های رشد و کم‌ترین ضریب تبدیل غذایی در تیمار حاوی 2/5 درصد متیونین مشاهده شد. هم چنین حضور متیونین در جیره سبب افزایش مقدار پروتئین و چربی در تیمار 2/5 درصد می‌گردد. از‌ این رو طبق نتایج حاصله، می‌توان بیان کرد که افزودن اسید آمینه متیونین به میزان 2/5 درصد در جیره بچه ماهی ازون برون سبب بهبود عملکرد رشد می‌گردد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effect of different level of methionine on growth performance and body composition of juvenile of stellate sturgeon (Acipenser stellatus)

نویسندگان [English]

  • Lima Tayebi
  • Mohammadhosein Dadfar
  • Davoud Mohammadrezaei
Department of Fisheries, Faculty of Natural Resources and Environment, Malayer University, Malayer, Iran
چکیده [English]

Methionine is an essential amino acid for fish, which deficiency of it reduces the growth and efficiency of the food. Methionine is usually the first essential limiting amino acid in many diets, especially those with high levels of plant proteins. This study aimed to investigate the effect of increasing the Methionine on growth, and body composition in juvenile of stellate sturgeon (Acipenser stellatus) during 8 weeks. A total of 200 fish were randomly distributed in 10 tanks. Fish were fed with diets containing different levels of the amino acid Methionine (0.5, 1.5, 2.5 percent and control diet). Growth and nutrition indices, including condition factor, body weight increasing, specific growth rate, food conversion ratio, body weight index, visceral index and carcass composition were evaluated. Based on the results, there was no significant difference in growth parameters between the experimental treatments, except for the feed conversion ratio, which had a significant difference (P <0.05). Accordingly, the highest performance of growth indices in the treatment contained 2.5 percent and the feed conversion ratio was related to the treatment of 1.5 percent methionine and the lowest was different in different treatments. On the other hand, the results showed that the presence of Methionine in the diet increases the amount of protein and fat in the treatment of 0.5 and 2.5 percent compared to the treatment of 1.5 percent. Therefore, it can be stated that the addition of the 2.5 percent Methionine in the diet of stellate sturgeon juvenile will improve growth performance.

کلیدواژه‌ها [English]

  • Methionine amino acid
  • Acipenser stellatus
  • Growth Indicators
  • Carcass Composition
  • juvenile of stellate sturgeon

مراجع

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فصلنامه محیط زیست جانوری
دوره 15، شماره 2
مرداد 1402
صفحه 243-248

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