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اثر شرایط نوری دورة انکوباسیون بر تخم مولدین قزل‌آلای رنگین‌کمان (Oncorhynchus mykiss) تغذیه شده با سطوح مختلف اسید اسکوربیک | ||
| شیلات | ||
| دوره 78، شماره 1، فروردین 1404، صفحه 15-26 اصل مقاله (1018.85 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/jfisheries.2022.337019.1309 | ||
| نویسندگان | ||
| زهره قادری فهلیانی1؛ بهرام فلاحتکار* 1؛ عبدالعلی راهداری2 | ||
| 1گروه شیلات، دانشکدة منابع طبیعی، دانشگاه گیلان، صومعه‌سرا، گیلان، ایران. | ||
| 2گروه شیلات، پژوهشکدة تالاب بین‌المللی هامون، پژوهشگاه زابل، زابل، سیستان و بلوچستان، ایران. | ||
| چکیده | ||
| تحقیق حاضر با هدف بررسی اثر شرایط نوری بر انکوباسیون تخم مولدین قزل‌آلای رنگین‌کمان تغذیه‌شده با سطوح مختلف اسید اسکوربیک انجام شد. به این منظور، تعداد 54 عدد مولد مادة قزل‌آلا با وزن متوسط 5/50±812 گرم به حوضچههایی با ابعاد 0/75×1/5×1 متر و حجم آبگیری 910 لیتر (هر حوضچه 6 مولد) معرفی گردیدند. مولدین به‌مدت 16 هفته با سه جیرة غذایی حاوی صفر، 100 و 1000 میلیگرم در کیلوگرم غذا اسید اسکوربیک از نوع ال-اسکوربیل-2-پلی فسفات تغذیه شدند. در پایان هفتة 16، تعداد 4 مولد از هر تکرار تخم کشی و لقاح انجام شد. تخم ها در هر سه تیمار تقسیم و تحت شرایط تاریکی و نور کامل (470 لوکس) دوره انکوباسیون را سپری کردند. نتایج به‌دست آمده حاکی از معنی دار بودن اثر اسید اسکوربیک بر هم آوری کاری (0/05>P) بود. درصد لقاح در تیمارهای حاوی 100 و 1000 میلی گرم اسید اسکوربیک در کیلوگرم، با تیمار شاهد اختلاف معنی داری داشت (0/05>P). بالاترین درصد چشم زدگی در تیمار 1000 میلی گرم اسید اسکوربیک و شرایط تاریکی کامل و کمترین مقدار آن در تیمار صفر و شرایط نوری دائم مشاهده شد (05/0>P). همچنین، در جیرة 1000 میلی گرم در کیلوگرم اسید اسکوربیک و تاریکی، درصد تخم چشم‌زده نسبت به دو تیمار دیگر و شرایط نور دائم به‌طور معنیداری افزایش یافت (0/05>P). اسید اسکوربیک جیره تأثیر معنیداری بر میزان تلفات از مرحلة چشمزدگی تا شنای عمودی نداشت (0/05<P) ولی کمترین مقدار (0/6±9/6 درصد) در جیرة 1000 میلیگرم در کیلوگرم جیره مشاهده شد. در خصوص درجه-روز تا مرحلة چشم زدگی، نتایج بیانگر عدم وجود اثر متقابل بود (0/777 =P)، ولی بین اسید اسکوربیک و نور در شاخص درصد چشم زدگی بود اثر متقابل وجود داشت (0/001>P). همچنین، در رابطه با درجه-روز تا مرحلة تبدیل به آلوین نیز نتایج نشان از عدم وجود اثر متقابل و تفاوت معنی دار بود (0/145 =P). نتایج این مطالعه نشان داد تغذیة مولدین قزل آلا با جیرة حاوی 1000 میلیگرم در کیلوگرم اسید اسکوربیک نسبت به جیره های شاهد و 100 میلی گرم در کیلوگرم اسید اسکوربیک منجر به بهبود شاخص های تولیدمثل می گردد. نتایج این مطالعه نشان دهندة ضرورت تغذیة مولدین قزل آلا با مقادیر بالای اسید اسکوربیک و انکوباسیون تخم در شرایط دور از نور جهت دستیابی به کارایی تولیدمثل بالاتر است. | ||
| کلیدواژه‌ها | ||
| انکوباسیون؛ تولیدمثل؛ قزل‌آلای رنگین‌کمان؛ نور؛ ویتامین C | ||
| عنوان مقاله [English] | ||
| Effect of light conditions during the incubation period on eggs of rainbow trout ( | ||
| نویسندگان [English] | ||
| Zohreh Ghaderi Fahliani1؛ Bahram Falahatkar1؛ Abdolali Rahdari2 | ||
| 1Fisheries Department, Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Guilan, Iran. | ||
| 2Department of Fisheries, Hamoun International Wetland Research Institute, Research Institute of Zabol, Zabol, Sistan and Baluchistan, Iran. | ||
| چکیده [English] | ||
| The aim of this study was to investigate the effects of different levels of dietary-ascorbic acid and dark-light periods on incubation indices of rainbow trout eggs. For this purpose, 54 breeders (812 ± 50.5 g) were introduced into the fish tanks with dimensions of 1.5×1.5×1 m with the holding capacity of 910 liters of water (6 fish per tank). Fish brooders were fed with three diets containing 0, 100 and 1000 mg/kg of L-ascorbyl-2-polyphosphate as treatments in triplicates for sixteen weeks. At the end of the experimental period, the oocytes of four female brooders were striped and fertilized with sperm and incubated under absolute darkness or constant light. The results showed that ascorbic acid significantly affecting on working fecundity (P<0.05). Fertilization rates in 100 and 1000 mg/kg had significant differences compared to control (P<0.05). The highest hatching rates and eyed eggs were observed in fish fed 1000 mg ascorbic acid and incubated under darkness (P<0.05). Dietary ascorbic acid had not significant effect on mortality during stages of eyed eggs to swim-up of larvae (P>0.05), but the lowest amount (9.6 ± 0.6%) was observed in 1000 mg/kg diet. Regarding the degree-day up to the eyed stage, the results showed no interaction among treatments (P= 0.777). However, there was an interaction between ascorbic acid and light in the percentage of eyed eggs (P<0.001). Moreover, in relation to the degree-day up to the stage of alevin, the results showed no interaction among treatments (P=0.145). The results of this study showed that feeding with a diet containing 1000 mg/kg ascorbic acid compare to control and 100 mg/kg ascorbic acid leads to improved reproductive indices. The results of this study indicate the necessity to feed rainbow trout breeders with high levels of ascorbic acid and egg incubation away from light to achieve higher reproductive efficiency. | ||
| کلیدواژه‌ها [English] | ||
| Incubation, Light, Rainbow trout egg, Reproduction, Vitamin C | ||
| مراجع | ||
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