پاسخ‌های اولیه و ثانویه تاس ماهی سیبری Brandt, 1869) Acipenser baerii) به استرس دستکاری در دو اندازه مختلف

نوع مقاله : فیزیولوژی (جانوری)

نویسندگان

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

2 گروه علوم دریایی، پژوهشکده حوضه آبی دریای خزر، دانشگاه گیلان، رشت، ایران

چکیده

 این مطالعه با هدف بررسی پاسخ‌های اولیه و ثانویه تاس­ماهی سیبری (Acipenser baerii) به استرس دستکاری در دو اندازه مختلف انجام گرفت. در این مطالعه ماهیان در دو گروه شامل اندازه کوچک با میانگین وزنی 2/54±627/27 گرم و اندازه بزرگ با میانگین وزنی 5/30±1078/5 گرم در شش تکرار با بیوماس یکسان توزیع شدند. برای بررسی تغییرات فیزیولوژیک خون، شش نمونه خون قبل از استرس و سه نمونه خون در 1، 3، 6، 12 و24 ساعت پس از استرس حاد (ماهیان دو دقیقه در معرض هوا قرار گرفتند) از هر گروه به‌طور تصادفی گرفته شد. میزان کورتیزول در هردو اندازه افزایش یافت اما بین ساعت­ ها اختلاف معنی‌داری دیده نشد (0/05˃p ). با توجه به نتایج به­‌دست ‌آمده، گلوکز خون در اندازه بزرگ  پس از استرس افزایش یافت و اختلاف معنی‌دار دیده شد (0/05˂p)، درحالی­ که اختلاف معنی‌داری در میزان گلوکز پس از استرس در تیمار اندازه کوچک دیده نشد (0/05˃p). میزان لاکتات در هر دو اندازه پس از استرس افزایش یافت و اختلاف معنی‌دار نشان داد (0/05˂p). نتایج نشان داد که ماهیان اندازه بزرگ پاسخ‌های استرسی بیش­تری نسبت به ‌اندازه کوچک نشان می‌دهند بنابراین نسبت به استرس حساس ­تر حستند.
 

کلیدواژه‌ها

عنوان مقاله [English]

Primary and secondary responses of Siberian sturgeon (Brandt, 1869) Acipenser baerii to handling stress in two different sizes

نویسندگان [English]

  • Sakineh Ebrahimi 1
  • Majidreza Khoshkholgh 2
  • Bahram Falahatkar 2
1 Department of Fisheries, Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Iran
2 Department of Marine Science, The Caspian Sea Basin Research Center, University of Guilan, Rasht, Iran
چکیده [English]

The aim of this study was to investigate the primary and secondary responses of Siberian sturgeon (Acipenser baerii) to handling stress on at two different sizes. In this study, the fish were distributed in small and large sizes with mean weights of 672.27 ± 2.54 g and 1078.5 ± 5.30 g, respectively, in six replicates with equal biomasses. Six blood samples were randomly taken before the stress thereafter three blood samples were taken at 1, 3, 6, 12 and 24 hours after acute stress (the fish were exposed to air for two minutes) to examine the physiological changes of blood. Cortisol levels increased in both sizes, although there was no significant difference in experimental treatments. According to the results, blood glucose increased in large size after stress and a significant difference was observed (p ˂ 0.05), but no significant was observed in small size (p ˃ 0.05). Lactate levels significantly increased in both sizes after stress (p ˂ 0.05). The results showed that large-sized fish show larger stress response than small size, and therefore they tend to be more susceptible to stress.

کلیدواژه‌ها [English]

  • Acute stress
  • Fish Size
  • Cortisol
  • Siberian sturgeon (Acipenser baerii)

مراجع

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فصلنامه محیط زیست جانوری
دوره 10، شماره 4
دی 1397
صفحه 235-242

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