تأثیر سطوح مختلف استات سدیم جیره بر کارآیی رشد و فعالیت آنزیم های گوارشی روده ماهی طلایی (Carassius auratus)

نوع مقاله : محیط زیست جانوری

نویسندگان

1 گروه شیلات، دانشکده منابع طبیعی، دانشگاه گیلان، صومعه سرا، ایران

2 گروه شیلات، دانشکده شیلات و محیط زیست، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران

چکیده

در این تحقیق، تأثیر سطوح مختلف استات سدیم جیره بر رشد و فعالیت آنزیم­­ های گوارشی روده ماهی طلایی (Carassius auratus) مورد مطالعه قرار گرفت. به این منظور 120 قطعه ماهی طلایی با وزن متوسط 1/29±14/24 گرم در 4 تیمار و 3 تکرار تقسیم شدند. تیمارها شامل غلظت­ های متفاوتی از نمک استات سدیم با مقادیر صفر (شاهد)، 2/5، 5 و 10 گرم به ­ازای هر کیلوگرم غذا بود. ماهی ­ها روزانه 3 بار در حد سیری و به­ مدت 75 روز غذادهی شدند. هر دو هفته یک­ بار زیست­ سنجی انجام شد و در پایان دوره آزمایش در هر تیمار از 6 ماهی جهت سنجش فعالیت آنزیم ­های پروتئاز و لیپاز نمونه ­برداری شد. نتایج به ­دست آمده نشان داد ماهیان تغذیه شده با 5 گرم نمک استات سدیم در هرکیلوگرم غذا، دارای بیش ­ترین وزن نهایی بودند، به ­طوری ­که اختلاف معنی­ دار آماری بین این تیمار در مقایسه با سایر تیمار­ها وجود داشت (0/05>P) اما تفاوت معنی ­دار آماری در دیگر شاخص ­های رشد اندازه ­گیری شده بین تیمار شاهد و تیمار­های تغذیه شده با نمک استات سدیم مشاهده نشد (0/05<P). از لحاظ میزان فعالیت آنزیم ­های لیپاز و پروتئاز نیز بین تیمارهای مختلف اختلاف معنی ­دار آماری مشاهده نشد (0/05<P). نتایج آزمایش کنونی نشان داد که استفاده از 5 گرم برکیلوگرم نمک استات سدیم در جیره غذایی ماهی طلایی می ­تواند باعث افزایش رشد این ماهی شده ولی تأثیری بر فعالیت آنزیم ­­های گوارشی روده ندارد.

کلیدواژه‌ها


عنوان مقاله [English]

The effects of different levels dietary sodium acetate on growth performance and digestive enzymes activity in goldfish (Carassius auratus)

نویسندگان [English]

  • Atefeh Rostamzadeh 1
  • Hamid Allaf Noveirian 1
  • Mirmasoud Sajjadi 1
  • Seyed Hossein Hoseinifar 2
1 Department of Fisheries, Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Iran
2 Department of Fisheries, Faculty of Fisheries and Environment, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
چکیده [English]

The present study investigates effects of different levels dietary sodium acetate (SA) salt on the growth and activity of digestive enzymes activity in goldfish (Carassius auratus). 120 fish (mean initial weight 14.24 ± 1.29 g) were fed 3 times a day with four experimental diets supplemented with 0, 2.5, 5 and 10 g/kg SA for 10 weeks. Biometry was done to measure growth and nutritional indices every two weeks. Also, six fish were randomly sampled at the end of experiment to study the activity of protease and lipase enzymes. The obtained results showed that fish fed with 5 g/kg SA had highest final weight, so there was a significant difference between the treatments compared to other treatments (P<0.05). However, no statistically significant difference was observed in other growth indices between control and SA fed fish (P>0.05). There was no significant difference in the lipase and protease activities between different treatments (P> 0.05). The results of the current test showed that the use of 5 g/kg SA could increase the growth of this fish. However, no notable effect was noticed in case of the activity of the digestive enzymes.

کلیدواژه‌ها [English]

  • Organic salts
  • Digestive enzymes
  • Growth indices
  • Gold fish (Carassius auratus)
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