اثرعصاره جلبک پادینا (Padina astraulis Hauck) روی شاخص‌های رشد، تغذیه، ترکیب شیمیایی و پروفایل اسیدهای چرب لاشه ماهی کفال خاکستری (Mugil cephalus Linnaeus, 1758)

نوع مقاله: مقاله کامل

نویسندگان

گروه شیلات، دانشکده علوم دریایی، دانشگاه دریانوردی و علوم دریایی چابهار، چابهار، ایران

چکیده

تحقیق حاضر به منظور بررسی اثر عصاره جلبک پادینا (Padina astraulis) بر شاخص‌های رشد، تغذیه، ترکیب شیمیایی و اسیدهای چرب بدن ماهی کفال خاکستری به‌مدت 62 روز صورت گرفت. در این مطالعه، تعداد 360 قطعه لارو کفال ماهی با میانگین وزنی 02 /0±82/0 گرم در یک طرح کاملا تصادفی با 4 تیمار آزمایشی و 3 تکرار (با تعداد 30 قطعه در هر تکرار) که شامل تیمار آزمایشی شاهد (بدون استفاده از عصاره جلبک) و در تیمار‌های آزمایشی 2، 3، 4 میزان استفاده از عصاره جلبک به ترتیب گرم در 5، 10، 15 کیلوگرم در غذا بود مورد استفاده قرار گرفتند. نتایج حاصله نشان داد که در پایان آزمایش، بالاترین وزن نهایی 11/0±22/4 گرم، بیشترین میزان رشد روزانه 51/0±77/1 درصد، کمترین ضریب تبدیل غذا 05/0±95/0، بالاترین میزان غذای دریافتی 12/0±81/2 درصد، بالاترین راندمان مصرف پروتئین 78/0±91/2، بالاترین راندمان مصرف چربی54/0±66/3 بیشترین میزان پروتئین لاشه 98/0±51/23 درصد، بیشترین میزان چربی لاشه 08/0±95/18 درصد و بیشترین سطوح اسیدهای چرب غیر اشباع چند زنجیره‌ای (PUFA) شامل اسید لینولئیک 04/0±51/6 درصد، اسید لینولنیک (09/0±81/4 درصد) و ایکوزا پنتانوئیک اسید (10/0±21/5 درصد) در تیمار حاوی گرم در 15 کیلوگرم عصاره جلبک مشاهده شد. که با تیمار شاهد دارای تفاوت معنی‌دار بود (05/0>P). در مجموع بر اساس نتایج این تحقیق، افزودن گرم در 15 کیلوگرم عصاره جلبک پادینا به جیره غذایی ماهی کفال خاکستری به منظور بهبود شاخص‌های رشد، تغذیه، کیفیت لاشه و افزایش اسید‌های چرب چند زنجیره‌ای در این ماهی پیشنهاد می‌شود.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Padina atraulis extract on growth, feed, carcass composition and fatty acids in Mugil cephalus Linnaeus, 1758

نویسندگان [English]

  • P. Akbary
  • N. Shahraki
Assistant Prof. of Fisheries Group, Marine Sciences Faculty, Chabahar Maritime University, Chabahar, Iran.
چکیده [English]

This experiment was conducted to evaluate the effect of Padina astraulis extract on the growth performances of Mugil cephalus in terms of final weight (FW) and daily growth ratio (DGR), feed indices (feed conversion rate) (FCR), voluntary feed intake (VFI), protein efficiency ratio (PER) and lipid efficiency ratio (LER) and body chemical (protein, fat, moisture and ash) and fatty acid composition of Mugil cephalus for 62 days. The experiment was conducted in a completely randomized design with 360 of grey mullet larvae (with average weight of 0.82±0.02g) in 4 treatments and 3 replicates (n=30 in each replicate) and included: control group without using algae extract, an another groups (treatment 2, 3 and 4) the amounts of this extract were 5,10 and 15 g/kg food. The results showed that at the end of experiment, the highest FW (4.22±0.11g), DGI (1.77±0.51%), the lowest FCR (0.95±0.05), the highest VFI (2.81±0.12 %), the highest PER (2.91±0.78), the highest LER (3.66±0.54), the highest crude protein (23.51±0.98%), the highest crude lipid (18.95±0.08%) and the highest poly unsaturated fatty acid (PUFA) including C18:2n-6 (6.51±0.04%), C18:3n-3 (4.81±0.09%) and C20:5n-3 (EPA) (5.21±0.10%) were observed in the diet containing 15 g /kg algae extract in all of these parameters, treatment 4 showed a significant difference compared with control treatment (P<0.05). Finally, the present results suggest that diet containing 15 g/kg Padina astraulis could improve growth, feed performances, carcass quality and increase PUFA level in Mugil cephalus larvae.

کلیدواژه‌ها [English]

  • Mugil cephalus
  • Padina astraulis extract
  • Carcass composition
  • FCR
  • Growth promoter
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