تأثیر افزودن ال-کارنیتین به جیرة غذایی در میزان مقاومت به استرس‌های دما و شوری در ماهی صبیتی (Sparidentex hasta)

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه شیلات، دانشکدة کشاورزی و منابع طبیعی، دانشگاه هرمزگان، ایران

2 دانشیار گروه شیلات، دانشکدۀ منابع طبیعی، دانشگاه هرمزگان، ایران

3 استادیار گروه شیلات، دانشکدة علوم و فنون دریایی و جوی، دانشگاه هرمزگان، ایران

4 دکتری تغذیة دام و آبزیان، مربی پژوهشی، سازمان تحقیقات کشاورزی، هرمزگان، ایران

چکیده

به منظور بررسی اثر افزودن ال-کارنیتین به جیرة غذایی در میزان مقاومت به استرس‌های دما و شوری در ماهی صبیتی (Sparidentex hasta)، آزمایشی با 240 قطعه بچه‌ماهی با میانگین وزن اولیة 03/0±01/3 گرم به مدت 10 هفته انجام شد. تیمارهای آزمایشی شامل چهار سطح صفر، 500، 1000 و 1800 (به ترتیب شاهد، 500LC، 1000LC و 1800LC) میلی‌گرم ال-کارنیتین در هر کیلوگرم جیره و با سه تکرار در قالب طرحی کاملاً تصادفی بودند. غذادهی در کل دوره به صورت دستی، و بر اساس سیری، روزانه در سه نوبت انجام شد. در پایان دورة آزمایشی، در آزمایش استرس دمایی، ماهیان به مدت 30 دقیقه در معرض دو دمای 15 و 37 درجة سانتی‌گراد و در آزمایش استرس شوری، ماهیان به مدت یک ساعت در معرض دو شوری 12 و 70 قسمت در هزار قرار گرفتند. در تیمارهای 1000LC و 1800LC مقاومت در برابر استرس دمای بالا، دمای پایین و شوری بالا در مقایسه با گروه شاهد دارای افزایش بود (05/0>P). علاوه بر این، در مقاومت در برابر استرس شوری پایین بین تیمارهای مختلف اختلاف معنی‌داری مشاهده نشد (05/0<P). نتایج این تحقیق نشان داد که افزودن ال-کارنیتین به جیرة غذایی می‌تواند در میزان مقاومت به استرس‌های دما و شوری در ماهی صبیتی تأثیرگذاری مطلوبی داشته باشد. از بین سطوح مختلف به‌کار برده‌شده، بهترین دوز مؤثر در مقاومت در برابر استرس دما و شوری در ماهی صبیتی سطح 1000 میلی‌گرم ال-کارنیتین بر کیلوگرم جیرة غذایی بود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The effect of dietary supplementation of L-carnitine on resistance to temperature and salinity stresses in Sobaity seabream Sparidentex hasta

نویسندگان [English]

  • Om-Albanin Taheri Kondor 1
  • Mir Masoud Sajjadi 2
  • Iman Sourinejad 3
  • Abd- Alrasoul Daryaei 4
  • Fereshteh Khademi 1
  • Ghodrat Mirzadeh 4
1 MSc. Department of Fisheries, Faculty of Agriculture and Natural Resources, University of Hormozgan, Iran
2 Associate Prof. Department of Fisheries, Faculty of Natural Resources, University of Hormozgan, Iran
3 Assistant Prof. Department of Fisheries, Faculty of Marine and Atmospheric Science and Technology, University of Hormozgan, Iran
4 PhD, Animal Nutrition and Aquatics- Research Lecturer, Agricultural Research, Hormozgan, Iran
چکیده [English]

To investigate the effect of dietary supplementation of L-carnitine on resistance to temperature and salinity stresses in Sobaity fry, an experiment was carried out with 240 pieces of fish with average initial weight of 3.01±0.03 g for 10 weeks. Experimental treatments were consisted of four levels of 0, 500, 1000 and 1800 (respectively control, LC500, LC1000 and LC1800) mg L-Carnitine per kg of diet, each with three replicates in a completely randomized design. During the experimental period, feeding was performed by hand and the fish were daily fed to satiation at three intervals. At the end of the experimental period, fish were exposed to two temperatures of 15 and 37°C for 30 minutes for thermal stress test and to two salinity levels of 12 and 70 ppt for one hour for salinity stress test. The results showed that in LC1000 and LC1800 treatments, the resistance to high temperature, low temperature and high salinity stresses increased significantly compared to control group (P<0.05). Furthermore, there was no significant difference in resistance to low salinity stress between the treatments (P>0.05). The results of present research revealed that the dietary supplementation of L-carnitine could favorably affect the resistance to temperature and salinity stresses in Sobaity fry. Between the different levels of L-carnitine used, the most effective dose on resistance to temperature and salinity stresses in Sobaity seabream fry was the level of 1000 mg L-carnitine per kg of diet.

کلیدواژه‌ها [English]

  • l-carnitine
  • Salinity stress
  • Sobaity Seabream
  • Sparidentex hasta
  • temperature stress
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