اثر استفاده از حلزون هرز شاخ قوچی (Planorbis sp) به عنوان غذا بر شاخص های رشد ماهی لوچ کماندو (Yasuhikotakia sidthimunki)

محورهای موضوعی : فصلنامه زیست شناسی جانوری

علی احمدی آسور ¹ (گروه منابع طبیعی، واحد سوادکوه، دانشگاه آزاد اسلامی، سوادکوه، ایران)
مریم شاپوری ² (گروه منابع طبیعی، واحد سوادکوه، دانشگاه آزاد اسلامی، سوادکوه، ایران)

تاریخ دریافت : 1400/08/10 تاریخ پذیرش : 1400/08/29 تاریخ انتشار : 1401/06/01

کلید واژه: تغذیه, شاخص رشد, حلزون هرز شاخ قوچی, ماهی لوچ کماندو,

چکیده مقاله :

این مطالعه به منظور بررسی اثرات استفاده از حلزون هرز شاخ قوچی به عنوان یک غذای طبیعی و کم هزینه بر شاخص های رشد ماهی لوچ کماندو که از لوچ ماهیان معروف در صنعت ماهیان زینتی می باشد، انجام گردید. برای این طرح 135 عدد با میانگین وزنی 01/0 ± 1 گرم و طول اولیه 02/0 ± 3 سانتی متر بودند. سپس بچه ماهیان به تعداد مساوی در 9 عدد آکواریوم شیشه ای به ابعاد 40*40*90 سانتی متر توزیع گردیدند. در این مطالعه از سه تیمار غذای طبیعی (حلزون)، شرکتی (بیومار) و ترکیبی (حلزون + بیومار) برای تغذیه لوچ ماهیان به مدت 48 روز استفاده گردید. در طی عملیات زیست سنجی فاکتورهای وزن، ضریب تبدیل غذایی، درصد بازماندگی، ضریب رشد ویژه و درصد افزایش وزن مورد بررسی قرار گرفت. نتایج بدست آمده بیش ترین میانگین میزان وزن (62/2 گرم) و طول نهایی (56/4 سانتی متر) را در تیمار های تغذیه شده با جیره ترکیبی نشان می دهد. همچنین مقایسه درصد بازماندگی ماهیان در تیمار های مختلف بیش ترین درصد بقا را در جیره ترکیبی با 7/97 درصد و کم ترین درصد بقا در جیره حلزون با 3/93 درصد نشان می دهد که تفاوت معنی داری را در این فاکتور نشان نمی دهد (05/0 > p). نتایج نشان می دهد استفاده ترکیبی از حلزون و بیومار در جیره غذایی منجر به بهبود شاخص های رشد در ماهیان می گردد.

چکیده انگلیسی:

This study was aimed at investigating the effects of using Planorbis sp as a natural and low-cost food on the growth indices of Yasuhikotakia sidthimunki, one of the most famous loach fish in the ornamental fish industry. To this end, 135 baby fish with an average weight of 1.0 ±0.01 g and an initial length of 3 ±0.02 cm were collected. Then, they were distributed in equal numbers in nine glass aquariums with dimensions of 40 * 40 * 90 cm. In this study, three treatments of natural food (snail), corporate (biomar), and combination (snail + biomar) were used to feed loach fish for 48 days. Weight factors, feed conversion ratio, survival rate, specific growth rate, and weight gain percentage were examined during bioassay operations. The results revealed that the highest mean weight (2.62 g) and final length (4.56 cm) were obtained in the combined feeding treatment. Moreover, the comparison of fish survival percentage in different treatments shows the highest survival percentage in the combined diet with 7.97% and the lowest survival percentage in the snail diet with 3.93%, not showing a significant difference in this factor (P < 0.05). The results show that the combined use of snails and biomar in the diet leads to improved growth indices in fish.

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