alexa TOXICITY & HISTOPATHOLOGICAL CHANGES IN THE THREE INDIA


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Research Article

TOXICITY & HISTOPATHOLOGICAL CHANGES IN THE THREE INDIAN MAJOR CARPS, LABEO ROHITA (HAMILTON), CATLA CATLA (HAMILTON) AND CIRRHINUS MRIGALA (HAMILTON) EXPOSED TO FENVALERATE

T. Anita Susan1, K. Sobha2 and K.S. Tilak3
  1. Department of Zoology, Andhra Christian College, Guntur-522004, Andhra Pradesh, India
  2. Department of Biotechnology, RVR & JC College of Engineering, Guntur-522019, Andhra Pradesh, India
  3. Department of Zoology, Acharya Nagarjuna University, Guntur-522010, Andhra Pradesh, India
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Abstract

Toxicity of synthetic pyrethroid Fenvalerate (technical grade and 20% Emulsifiable concentrate) to the fry and fingerling stages of the three major carps viz., Catla catla, Labeo rohita and Cirrhinus mrigala was studied using static and continuous flow through systems. A comparison has been made to find out relative sensitivity of fry and fingerling stages of the carps exposed to the two forms of the toxicant fenvalerate. The LC50 values for 24h, 48h and 96h were highest in Cirrhinus mrigala followed by Catla catla and Labeo rohita for fry, while that of fingerling stage were highest in Catla catla followed by Labeo rohita and Cirrhinus mrigala in the decreasing order. On exposure to 20% EC fenvalerate, the LC50 values of both fry and fingerlings for 24h, 48h and 96h were highest in Cirrhinus mrigala followed by Catla catla and Labeo rohita. Our observations indicate that static LC50 values are nearly thrice (2.5 to 3 times) higher than continuous flow through LC50 values. For histopathological studies, fingerlings of the three carps were exposed to the sub-lethal concentration (1/10th of 24h LC50) for ten days and the vital tissues like gill, liver and kidney were isolated and processed for histopathological examinations. All the tissues showed significant deteriorative changes as compared to control

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