Pesticides are highly used in world’s agriculture, sometimes affecting non-target organisms. Acetamiprid (chemical pesticide) affects behavior, morphology, biochemistry and blood electrolytes of aquatic inhabitants after agricultural runoffs. Azadirachta indica is an ecofriendly pesticide as it protects the environment and decreases the objectionable impacts of synthetic pesticides. This book evaluates the toxicity potential of acetamiprid and Azadirachta indica leaves extract on biochemical parameters of Labeo rohita. This book will be very helpful for the agriculturist, environmentalist and toxicologist and it can be used as a ready reference for students, researchers, technology developers and policy makers.