مقايسه آناليزلاشه و پروفايل اسيدهاي چرب بين قزل‌آلاي رنگين كمان رودخانه‌اي، پرورشي (Oncorhynchus mykiss) و قزل‌آلاي خال قرمز (Salmo trutta fario) در رودخانه هراز

Comparison of corpus analysis and of fatty acid profiles between rainbow trout of river and farm (Oncorhynchus mykiss) and red speckled trout (Salmo trutta fario) from Haraz River

تحقيق حاضر با هدف تعيين تركيب شيميايي و پروفايل اسيد‌هاي چرب بافت عضلاني سه گروه از آزاد‌ ماهيان رودخانه‌اي و پرورشي شامل قزل­آلاي رنگين­كمان رودخانه‌اي و پرورشي (Oncorhynchus mykiss) و قزل ­آلاي خال قرمز (Salmo trutta fario) انجام شد. در مجموع 9 عدد ماهي قزل ­آلاي رنگين كمان رودخانه ­اي، خال قرمز و قزل ­آلاي پرورشي از محدوده رودخانه هراز نمونه برداري شد. نمونه‌ها به حالت منجمد به آزمايشگاه منتقل، زيست سنجي سپس تركيبات لاشه و پروفايل اسيدهاي چرب با سه تكرار اندازه گيري شدند. مطابق با نتايج زيست سنجي و آناليز لاشه (خاكستر، رطوبت، پروتئين و چربي) اختلاف معنا‌داري بين سه گروه مشاهده نشد (0/05P).اما در ميزان امگا 3 (ω-3)، امگا 6 (ω-6)، ايكوزاپنتائنوئيك اسيد (EPA) و دوكوزا هگزانوئيك اسيد (DHA) بين گروه­ها اختلاف معني‌داري ديده نشد (0/05

The purpose of this study was to determine the chemical composition and fatty acid profile of muscle tissue in three groups of salmonids including:Rainbow trout river and farmed (Oncorhynchus mykiss) and red speckled trout (Salmo trutta fario(.A total of 27 rainbow trout of river and red speckled trout from the river Haraz and farmed fish were sampled from around the Haraz River. The samples were transferred frozen to the laboratory. The carcass composition biometry was conducted and then the fatty acid profiles were prepared with three replications. According to biometric and carcass analysis (ash, moisture, protein and fat), there was no significant difference between the three groups (P <0.05).The highest amount of saturated fatty acids content of (SFA) 24.85 ± 0.87, monounsaturated (MUFA) of 48.33 ± 1.06 and polyunsaturated fatty acid (PUFA) of 45.95 in river trout, speckled red and farmed there was a significant difference between the three species (p < 0.05). But in the omega-3, omega-6 EPA and DHA, there was no significant difference between species. The ratio of ω-3/ω-6 was higher than one in all species. The highest ratio of ω-3/ω-6 were observed in farmed trout 3.30± 0/625, red spotted trout 2.44± 0.458 and river trout 2.36± 0.706. In all three groups of ω-3/ω-6 was higher than the recommended dose of experts. Based on the results a river trout, farmed and red speckled trout are very rich in nutritional value.