Description
Pesticides protect the world’s crops, but they rarely stay where they are sprayed. Rain, spray drift and field drainage carry them into streams, paddies, ponds and wells, the same waters that support fish, farms and families. Residues have been detected in rivers, sediments and fish in many parts of the world. Fish live in that water, so they are often the first to show the damage. Fish as Sentinels follows pesticides from the treated field to the water, into fish and finally to the people who depend on them. It explains how organophosphates, pyrethroids, organochlorines and newer chemistries injure fish gills, nerves, reproduction and immunity, and how the same chemicals reach people through farm work, drinking water and food. It shows why a compound that looks safe for people can be extremely toxic to fish, and how long-lasting contaminants build up through the food chain. Chapters on residues, health effects and vulnerable groups show why fish are valuable early warning signals of wider environmental and public health risks. The book is practical and up to date. It covers monitoring methods and biomarkers, national and international regulation, and emerging trends such as integrated pest management, biopesticides, drones and precision agriculture. It also looks at protective measures for farms, aquaculture ponds and consumers. Real cases from Kerala, Punjab and Andhra Pradesh, together with global examples such as the Rhine fish kill, show what is at stake. Around thirty tables and clear diagrams make complex ideas easy to follow. Written for students, researchers, aquaculture professionals and policy makers, this book makes one central point: when fish are harmed, people are at risk too, and protecting one means protecting both. Whether you are planning research, managing a pond or shaping policy, it offers a clear, evidence-based starting point.