Effect of Handling Stress on Primary and Secondary Stress Responses of the Catfish, Clarias batrachus

Shifali Hafeez, F. A. Sherwani
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Abstract

Cortisol is a major hormone directly associated with stress in fish and is a reliable physiological indicator of primary stress response in fish, whereas glucose and osmolality are the indicators of secondary stress response in fish. This study explored the stress levels in the catfish, Clarias batrachus (Magur) by measuring the cortisol, glucose, and osmolality levels in plasma by exposing the fish to three different kinds of interventions namely, non-anaesthetized, anaesthetized, and stressed. No statistically significant changes were reported in the plasma cortisol, plasma glucose, and plasma osmolality levels when the blood samples were collected after the three interventions. These results indicated that Clarias batrachus is a sturdy fish, which can withstand routine laboratory handling, and that the blood samples can be collected without anaesthetization.
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处理应激对鲶鱼主、次应激反应的影响
皮质醇是鱼类应激直接相关的主要激素,是鱼类初级应激反应的可靠生理指标,而葡萄糖和渗透压是鱼类次生应激反应的指标。本研究通过对鲶鱼进行三种不同的干预,即非麻醉、麻醉和应激,通过测量血浆中的皮质醇、葡萄糖和渗透压水平,探讨了应激水平对Clarias batrachus (Magur)的影响。在三种干预措施后采集血液样本时,血浆皮质醇、血浆葡萄糖和血浆渗透压水平均无统计学意义的变化。这些结果表明,claras batrachus是一种强壮的鱼,可以承受常规的实验室处理,并且可以在不麻醉的情况下采集血液样本。
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