اثرات تغذیه با سطوح مختلف کرم خاکی (Eisenia fetida) بر کیفیت آب مخازن پرورش ماهی قزل آلای رنگین کمان (Oncorhynchus mykiss)

نویسندگان

1 دانشجوی کارشناسی‌ارشد، شیلات، دانشکده کشاورزی و منابع طبیعی، دانشگاه گنبد کاوس، گلستان، ایران

2 استادیار، گروه شیلات، دانشکده کشاورزی و منابع طبیعی، دانشگاه گنبد کاوس، گلستان، ایران

3 دانشیار، گروه شیلات، دانشکده کشاورزی و منابع طبیعی، دانشگاه گنبد کاوس، گلستان، ایران

چکیده

این آزمایش با هدف تأثیر استفاده از کرم خاکی (Eisenia fetida) زنده به­عنوان مکمل غذایی بر کیفیت آب مخارن پرورش ماهی قزل­آلای رنگین‌کمان طراحی شد. ماهیان با میانگین وزنی 58 گرم در قالب طرح کاملا تصادفی در 4 تیمار و هر یک در 3 تکرار تقسیم شدند. ماهی قزل­آلا با سطوح مختلف (شاهد- بدون کرم (صفر درصد)، T1 (25 درصد)، T2 (50 درصد) و T3 (75 درصد)) جیره غذایی از کرم زنده (با احتساب 50 درصد رطوبت) به‌مدت 8 هفته در دمای (18 درجه سانتی‌گراد) تغذیه شدند. در پایان آزمایش، فاکتورهای کیفی آب شامل PH (بیش‌ترین شاهد 9/7، کم­ترین تیمار 3 4/7) DO (بیش­ترین تیمار 3 8/7، کم­ترین شاهد 7/6)، TSS، TAN (بیش‌ترین شاهد 16/0، کم­ترین تیمار 3 057/0)، NO2-(بیش­ترین شاهد 05/0، کم­ترین تیمار 3 01/0)وNO3-(بیش­ترین شاهد 6/6، کم‌ترین تیمار 3 35/3)سنجیده شد. مقایسه میانگین­های به‌دست آمده از این فاکتورها نشان از اختلاف معنی­دار [Dr.1] آماری PH شاهد با دیگر تیمارها، DO و TSS بین همه تیمارهای آزمایشی داشت (05/0P<). میزان TAN در نمونه‌برداری اول تیمارهای فوق دارای اختلاف معنی­دار آماری بودند (05/0P<)، اما این مقدار در نمونه‌برداری آخر نشان­گر کاهش مقدار TAN و عدم اختلاف آماری معنی­دار بین تیمار 2 و تیمار 3 [Dr.2] بود (05/0P≥). مقایسه  NO2-و NO3- در نمونه‌برداری­های متوالی کاهش معنی­دار آماری بین همه تیمارها، با افزایش میزان کرم در غذا، مشاهده شد (05/0P<). استفاده از کرم خاکی در سطح 50 درصد بهترین افزایش رشد و کیفیت آب مخازن را داشت.



 

کلیدواژه‌ها


عنوان مقاله [English]

The effect of dietary Earth worm (Eisenia fetida) difference levels on water quality of Rainbow trout (Oncorhynchus mykiss) rearing tanks

نویسندگان [English]

  • mohammad khademi hamidi 1
  • Mohamad Harsig 2
  • Hojatolah Jafarian 3
  • Mohamad Farhangi 2
1 Student, Department of Fisheries, Faculty of Agriculture Sciences and Natural Resources, GonbadKavous University,GonbadKavous, Iran.
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