Ecology, Environment and Conservation Paper

Vol.15, Issue 02, 2009; Page No.(241-244)

EVALUATION OF HERBAL STRESS SU RESSOR (STRESROAK) ON CORTISOL LEVELS IN COMMON CARP, CYPRINUS CARPIO

K. Sithara and K. Kamalaveni

Abstract

Blood plasma cortisol concentration is an indicator of stress in fish and stress suppressors may serve to ameliorate stress and reduce the cortisol response. Plasma cortisol was evaluated in Common carp, Cyprinus carpio after applying thermal stress and treatment were carried out with a herbal stress suppressor (Stresroak) through immersion and feed in different concentration. Fishes in all stresroak treatment had showed lower cortisol levels than untreated controls. Stresroak shows a significant stress relieving effect at the 2 g/kg of feed and 20 mg/L of stresroak immersion. Hence Stresroak can be recommended as a potent stress reliever in aquaculture. Therefore the use of such stress suppressor especially stresroak should be beneficial in reducing thermal stress. Based on our data further studies refining the use of herbal stress suppressor are warranted in common carps.

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