تاثیر توام تراکم و استراتژی های مختلف تغذیه ای بر عملکرد رشد و شاخص های هماتولوژیک ماهی کوی (Cyprinus carpio var. Koi)

نوع مقاله: تغذیه

نویسندگان

گروه شیلات، دانشکده منابع طبیعی، دانشگاه گیلان، صومعه سرا، ایران

چکیده

 در تحقیق حاضر اثر استراتژی­ های مختلف تغذیه ­ای در تراکم­ های مختلف ذخیره ­سازی بر رشد و پارامترهای هماتولوژیک ماهی کوی (Cyprinus carpio var. Koi) با میانگین وزن 0/27±3/44 گرم و به ­مدت 45 روز مورد بررسی قرار گرفت. برای این منظور ماهی ­ها در 6 تیمار آزمایشی در 3 تکرار شامل، تراکم بالا (20 عدد ماهی در مخزن) و تغذیه در حد سیری (20 C)، تراکم پایین (10 عدد ماهی در مخزن) و تغذیه در حد سیری (10 C)، تراکم بالا و تغذیه در حد 50% سیری (20 R)، تراکم پایین و تغذیه در حد 50% سیری (10 R)، تراکم بالا و گرسنگی (20 S)،  تراکم پایین و گرسنگی (10 S) درنظر گرفته شد. زیست­ سنجی ماهیان و اندازه ­گیری شاخص ­های رشد و تغذیه هر 15 روز یک ­بار انجام گرفت. در پایان دوره آزمایش خونگیری از ماهیان جهت اندازه­ گیری پارامترهای خونی به ­عمل آمد. نتایج نشان داد در پارامترهای رشد ماهی کوی با اعمال توام استراتژی تغذیه ­ای در تراکم مختلف اثر معنی­ داری بر فاکتورهای وزن کسب شده و فاکتور وضعیت  ماهیان مشاهده شد (0/05>P). پارامتر­های رشد در تیمارهای 20 C و 10 C نسبت به سایر تیمارها بالاتر بود. هم­ چنین با بررسی نتایج آنالیز خون ماهیان اعمال استراتژی تغذیه­ ای در تراکم مختلف تفاوت معنی­ داری در تعداد گلبول ­های سفید، درصد لنفوسیت و نوتروفیل ماهیان مشاهده شد (0/05>P). نتایج پژوهش کنونی نشان داد که تغذیه در حد سیری در تراکم بالا و پایین تاثیر مثبتی بر روی عملکرد رشد و پارامترهای هماتولوژیک ماهیان کوی دارد.

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