کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8493065 | 1552793 | 2018 | 33 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Chronic exposure to increased water temperature reveals few impacts on stress physiology and growth responses in juvenile Atlantic salmon
ترجمه فارسی عنوان
در معرض قرار گرفتن در معرض شدید دمای آب، اثرات چندگانه بر فیزیولوژی استرس و پاسخ های رشد در ماهیان آتلانتیک نوجوانان نشان می دهد
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کلمات کلیدی
استرس مزمن، کورتیزول، گلوکز، کلسترول، رشد دوجانبه،
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم آبزیان
چکیده انگلیسی
Fish are subjected to a variety of stressors under common cage aquaculture conditions. While short-term exposure to a stressor often results in an adaptive response to cope with stress, repeated and/or chronic exposure to stress can result in negative impacts on fish welfare and production. In fish, little is known about the impact of long-term exposure to stressors, including elevated water temperature. In this study we examined and developed temporal response profiles of physiological indicators of stress and growth in juvenile Atlantic salmon (Salmo salar) exposed to 12â¯Â°C, 16â¯Â°C, and 20â¯Â°C for 99â¯days. Five times throughout the study we quantified plasma cortisol, glucose and cholesterol levels, and growth. Fish body mass and fork length were not significantly different amongst temperatures after 99â¯days. Plasma cortisol was significantly elevated at 16â¯Â°C when comparing day 8 with 99, while at 12â¯Â°C plasma cortisol increased from day 1 to day 8, then returned to initial levels (day 1 and 8) after 99â¯days. Plasma glucose and cholesterol were not significantly different amongst the temperatures throughout the experiment. In addition, at the end of the experiment we quantified eye darkening, and identified the development of a bimodal growth distribution in all temperatures. Fish with a fork lengthâ¯â¤â¯240â¯mm were categorised as lower mode (LM) and those with a fork lengthâ¯>â¯240â¯mm as in the upper mode (UM) of growth. Plasma cholesterol was significantly lower in the LM group in all three temperatures, but plasma cortisol and glucose levels did not differ between modes. Eye darkening also did not differ between modes, but increased significantly in the groups exposed to 16â¯Â°C and 20â¯Â°C when compared with 12â¯Â°C. This study showed a clear physiological stress response (elevated levels of cortisol) and eye darkening in fish maintained at 16â¯Â°C but not at 12â¯Â°C or 20â¯Â°C, suggesting that some aspects of the physiological responses available to deal with chronic stress are affected by temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Aquaculture - Volume 495, 1 October 2018, Pages 196-204
Journal: Aquaculture - Volume 495, 1 October 2018, Pages 196-204
نویسندگان
Jared J. Tromp, Paul L. Jones, Morgan S. Brown, John A. Donald, Peter A. Biro, Luis O.B. Afonso,