بررسی کیفیت آب و رشد بچه ماهی کپورمعمولی (Cyprinus carpio) تحت تغذیه با جیره های حاوی سطوح مختلف پروتئین در سیستم بیوفلوک

نوع مقاله: تغذیه

نویسندگان

1 گروه شیلات، دانشکده شیلات و محیط زیست، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، صندوق پستی: 487-49175

2 گروه تغذیه دام و طیور، دانشکده علوم دامی، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، صندوق پستی: 487-49175

چکیده

این مطالعه جهت ارزیابی اثرات بیوفلوک روی بهبود کیفیت آب و عملکرد رشد بچه ماهی کپورمعمولی (Cyprinus carpio) تغذیه شده با جیره­ های حاوی مقادیر مختلف پروتئین به ­میزان 23، 27، 31 و 35 درصد و تیمار آزمایشی بدون بیوفلوک در یک دوره 8 هفته صورت گرفت. متوسط مقدار اکسیژن (5/33) و( pH (8/05  در تیمارها بررسی شده و در تیمار شاهد بیش­ تر از تیمارهای بیوفلوکی بود. غلظت جامدات معلق کل  در تیمارهای بیوفلوکی به ­طور معنی ­داری بالاتر از تیمار شاهد بود (0/05>P) کیفیت خوب آب با توسعه بیوفلوک از طریق افزودن ملاس چغندرقند در طی آزمایش غذایی نگه داشته شد. با گذشت زمان و توسعه بیوفلوک در تیمارهای بیوفلوکی، مقدار آمونیاک، نیترات و نیتریت از هفته چهارم آزمایش شروع به کاهش نمود و در انتهای آزمایش مقدار آن ­ها در تیمارهای بیوفلوکی کم ­تر از تیمار شاهد شده بود. رشد براساس درصد وزن حاصله و ضریب رشد ویژه در بچه ماهی ­های تغذیه شده با جیره­ های حاوی 27 و 31 درصد پروتئین  به­ طور معنی ­داری بالاتر از بچه ماهی های تیمار شاهد بود که با جیره حاوی 35% پروتئین تغذیه کرده بودند (0/05>P). در مجموع نتایج این مطالعه نشان داد که در سیستم بیوفلوک، تغذیه ماهی کپورمعمولی با جیره حاوی 27 و 31 درصد پروتئین، بهترین نتیجه را در بهبود کیفیت آب و عملکرد رشد دارد.

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