تأثیر سطوح مختلف عصاره غنی از فلوروتانین در جیره غذایی بر شاخص‌های رشد و تغذیه میگوی پا سفید غربی (Litopenaeus vannemei)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش آموخته کارشناسی ارشد، گروه شیلات، دانشکده علوم دریایی، دانشگاه دریانوردی و علوم دریایی چابهار

2 استادیار گروه شیلات، دانشکده علوم دریایی، دانشگاه دریانوردی و علوم دریایی چابهار

چکیده

در مطالعه حاضر تأثیر افزودن سطوح مختلف (1، 3 و 5 درصد) فلوروتانین استخراج شده از جلبک قهوه‌ای سارگاسوم (Sargassum sp.) به جیره غذایی میگوی پا سفید غربی (Litopenaeus vannamei) بر عملکرد رشد، تغذیه، فعالیت آنزیم‌های گوارشی و ترکیب شیمیایی بدن طی دوره پرورش 5 هفته‌ای بررسی گردید. در طی 5 هفته، طول و وزن تمامی تیمارها به طور معنی داری افزایش یافت (05/0>P)، با این وجود میزان افزایش در گروه‌های مختلف، متفاوت بود و بیش‌ترین افزایش در تیمار فلوروتانین 5 درصد به دست آمد (05/0>p). در شاخص‌های وزن نهایی، افزایش وزن بدن، نرخ رشد، نرخ رشد ویژه و ضریب تبدیل غذایی بهترین عملکرد در میگوهای پا سفید غربی تغذیه شده با جیره‌غذایی حاوی 5 درصد فلوروتانین وجود داشت (05/0>p). فعالیت نسبی آنزیم‌های اصلی گوارشی یعنی آمیلاز، پروتئاز و لیپاز و هم چنین درصد پروتئین و چربی لاشه در میگوهای تغذیه شده با فلوروتانین 5 درصد در مقایسه با دیگر تیمارها بیش‌تر بود (05/0>p). نتایج نشان داد که استفاده از فلوروتانین به عنوان یک ترکیب زیست‌فعال طبیعی در سطح 5 درصد در جیره غذایی می‌تواند باعث بهبود عملکرد رشد، تغذیه، فعالیت آنزیم‌های گوارشی و ترکیب شیمیایی بدن میگوی پا سفید غربی در طی دوره پرورش گردد.

کلیدواژه‌ها


عنوان مقاله [English]

The effect of different levels of dietary-phlorotannins-rich extract on the growth and nutritional indices of whiteleg shrimp (Litopenaeus vannemei)

نویسندگان [English]

  • Osman Balouch Lashari 1
  • Salim Sharifian 2
1 MSc graduate, Department of Fisheries, Faculty of Marine Sciences, Chabahar Maritime University, Chabahar, Iran
2 Assistant Professor, Department of Fisheries, Faculty of Marine Sciences, Chabahar Maritime University
چکیده [English]

In the present study, the effect of using different levels of dietary -phlorotannins (1, 3 and 5%) extracted from Sargassum brown seaweed on growth function, nutrition, digestive enzyme activity and body chemical composition of white leg shrimp (Litopenaeus vannemei) was studied during a culture period of 35 days. During 5 weeks, the length and weight of all treatments increased significantly (P<0.05), however, the rate of increase was different in different groups and the highest rate was achieved in phlorotannins treatment of 5% (P<0.05). The best records of final weight, percentage of body weight index, growth rate, specific growth rate and feed conversion ratio, resulted in diet containing 5% phlorotannins (P>0.05). The relative activity of major digestive enzymes namely amylase, protease and lipase as well as protein and lipid content was higher in treatment containing 5% phlorotannins compared to other treatments (P<0.05). The results showed that the use of phlorotannins as a natural bioactive compound at the level of 5% in the diet can improve the growth, nutrition, activity of digestive enzymes and chemical composition of white leg shrimp during the culture period. 

کلیدواژه‌ها [English]

  • Seaweed
  • Phlorotannins
  • Diet
  • Shrimp
  • Growth Index
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