اثرات تراکم ذخیره سازی و دفعات غذادهی بر شاخص های رشد و هماتوکریت در بچه ماهی کلمه

نویسندگان

دانشگاه علوم کشاورزی و منابع طبیعی گرگان

چکیده
دفعات تغذیه و تراکم ذخیره­سازی از فاکتورهای مهم مؤثر بر رشد و بلوغ ماهیان پرورشی است. هدف این مطالعه تعیین اثرات تراکم (10، 20، 30 و 40 قطعه ماهی در آکواریوم) و دفعات تغذیه (2، 3 و 4 نوبت غذادهی در روز) بر پارامتراهای رشد و هماتوکریت ماهی کلمه (Rutilus rutilus caspicus) است. آزمایش در دو تکرار و به مدت 45 روز انجام شد. نتایج این مطالعه نشان داد که پارامترهای رشد شامل افزایش وزن، ضریب تبدیل غذا و نرخ رشد ویژه به­ طور معنی ­داری تحت تأثیر تراکم قرار گرفتند (05/0>P)، اما دفعات غذادهی اثر معنی­ داری نداشت (05/0<P). بالاترین وزن و نرخ رشد ویژه در پایین­ ترین تراکم (10 قطعه ماهی در آکواریوم) ثبت شد. کمترین ضریب تبدیل غذا در تراکم 10 قطعه ماهی در آکواریوم بدست آمد، ضریب تبدیل غذا با افزایش تراکم به­ طور معنی­ داری افزایش یافت (05/0>P). همچنین، اثرات متقابل تراکم و دفعات غذادهی بر پارامترهای رشد معنی­ دار نبود (05/0<P). تراکم و دفعات تغذیه تأتیر معنی­ داری بر میزان هماتوکریت نداشت (05/0<P). از سوی دیگر، اثرات متقابل تراکم و دفعات تغذیه بر میزان هماتوکریت معنی­دار بود (05/0>P). کمترین سطح هماتوکریت در تراکم 10 و با دو وعده غذادهی در روز مشاهده شد. نتایج این مطالعه نشان داد که تراکم بر رشد اثر معنی­ داری دارد، اما افزایش دفعات غذاذهی تأثیری بر رشد ماهی کلمه ندارد.

کلیدواژه‌ها


عنوان مقاله English

Effects of stocking density and feeding frequency on the growth parameters and hematocrit of the Rutilus rutilus caspicus juvenile

نویسندگان English

Mohammadreza Imanpour
Mahrokh Nemati
Hadiseh Afshar
Zahra Roohi
Gorgan university of Agricultural science and Natrual science
چکیده English

Feeding frequency and stocking density are important factors affecting growth and maturation of cultured fishes. The aims of this investigation were to determine the effects of stocking density (10, 20, 30 and 40 fish per aquarium) and feeding frequency (2, 3 and 4 times per day) on growth parameters and hematocrit of the Rutilus rutilus caspicus. The experiment was continued for 45 days in two replicates. The results of this study showed that growth parameters, including weigh gain (WG), feed conversion ratio (FCR) and specific growth rate (SGR) were affected significantly by stocking density (P<0.05), but not significantly affected by feeding frequency (P>0.05). The highest WG and SGR were recorded with the lowest stocking density (10 fish / aquarium). The least FCR was obtained in density of 10 fish/aquarium, FCR value was significantly higher with high stocking density (P<0.05). Also, interactions between stocking density and feeding frequency were no significant on growth parameters (P>0.05). Density and feeding frequency hand no significant effect of hematocrit concentration (P>0.05). On the other hand, interactions between stocking density and feeding frequency significantly affected hematocrit levels (P<0.05). The lowest level of hematocrit was observed in density of 10 fish/aquarium at two times / day feeding frequency. The results of this study indicated that density is significantly affected the growth, but increasing of feeding frequency there is not effect on growth in the Rutilus rutilus caspicus.

کلیدواژه‌ها English

blood
fish
nutrition
specific growth rate
weight
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  • تاریخ دریافت 18 خرداد 1405
  • تاریخ انتشار 18 خرداد 1405