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.

کلیدواژه‌ها

عنوان مقاله [English]

Investigating water quality and growth of Cyprinus carpio fingerlings fed with different protein levels of diet in biofloc system

نویسندگان [English]

  • Mahsa Mahmoudi Khoshdarehgi 1
  • Abdolmajid Haji Moradloo 1
  • Behrouz Dastar 2
1 Fisheries Department, Faculty of Fisheries and Environmental sciences, Gorgan University of Agricultural Sciences and Natural Resources., P.O.Box: 49175-487 Gorgan, Iran
2 Animal and Poultry Nutrition Department, Faculty of Animal Science, Gorgan University of Agricultural Sciences and Natural Resources, P.O.Box: 49175-487 Gorgan, Iran
چکیده [English]

This study was conducted to investigate the effects of biofloc on water quality and growth efficiency of Cyprinus carpio fingerlings fed with different protein levels (23%, 27%, 31% and 35%) and a trial treatment with no biofloc in 8 weeks period. Mean oxygen rate (5.33) and pH (8.05) were investigated and were high in control treatment than BFT treatments. Total suspended solids was significantly high than control treatment (P<0.05). During feed experiment, good water quality was kept with biofloc development by adding sugar beet molasses. In biofloc treatments, ammonia, nitrate and nitrite amount decreased from the fourth week through time and biofloc developments, and their amount in biofloc treatments was lower than control treatment at the end of the experiment. Growth efficiency based on weight gain percentage and specific growth rate in fingerlings fed with 27% and 31% protein level was significantly higher than control treatment that fed with diet containing 35% protein (P<0.05). Totally, results of this study showed that in biofloc system, feeding of Cyprinus carpio with diet containing 27 and 31% protein has the best result in improvement of water quality and growth.

کلیدواژه‌ها [English]

  • Water quality
  • Growth efficiency
  • Cyprinus carpio
  • Protein diet
  • Biofloc system

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فصلنامه محیط زیست جانوری
دوره 10، شماره 3
مهر 1397
صفحه 191-198

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