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Protocol for Acute and Chronic Ecotoxicity Testing of the Turquoise Killifish Nothobranchius furzeri

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Lambda cyhalothrin induced alterations in Clarias batrachus.

R Saravanan¹, K Revathi, P Balakrishna Murthy

¹International Institute of Biotechnology and Toxicology, Padappai, India. rsaravanan2@yahoo.com

Journal of Environmental Biology

|February 4, 2010

Summary

This summary is machine-generated.

Synthetic pyrethroid lambda-cyhalothrin exposure significantly disrupts endocrine function in catfish. This pesticide exposure led to decreased thyroid hormones and testosterone, and increased cortisol levels in Clarias batrachus.

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Area of Science:

Environmental toxicology
Endocrinology
Aquatic biology

Background:

Synthetic pyrethroids, like lambda-cyhalothrin, are widely used pesticides.
Pesticide exposure can disrupt endocrine systems in aquatic organisms.
Clarias batrachus (freshwater catfish) is a relevant model for studying aquatic toxicology.

Purpose of the Study:

To investigate the toxic effects of lambda-cyhalothrin on endocrine gland function in freshwater catfish.
To analyze alterations in hormone secretion following pesticide exposure.

Main Methods:

Freshwater catfish (Clarias batrachus) were exposed to a sublethal concentration (5.768 ppm) of lambda-cyhalothrin for 45 days.
Hormone profiles, including thyroid hormones, testosterone, and cortisol, were analyzed at 15, 30, and 45 days of exposure.

Main Results:

A significant decline in thyroid hormones and testosterone levels was observed (p<0.05).
A significant increase in cortisol levels was noted (p<0.05) during the exposure period.
These hormonal changes indicate stress and disruption of endocrine regulation.

Conclusions:

Lambda-cyhalothrin exposure induces significant endocrine disruption in Clarias batrachus.
The observed hormonal imbalances suggest potential adverse effects on fish health and reproduction.
Further research is needed to understand the long-term ecological implications of such toxic effects.