First comprehensive field guide catalogues over 100 fish species in Chennai's waters

A new field guide released on Madras Day has catalogued more than 100 freshwater and brackish fish species living in Chennai's rivers, lakes, temple tanks and estuaries, filling a gap in documentation that has existed despite the city's historic ties to aquatic life.

First comprehensive visual reference

Fishes of Chennai, compiled by Aravind Manoj and Beta Mahatvaraj, organises species by body type and habitat preference rather than scientific taxonomy, making identification accessible to non-experts. The guide features about 150 photographs and includes short accounts of each fish's size, diet, habitat and conservation status.

"Chennai's rivers, lakes, temple tanks, and estuaries are full of fish, and until now no single book had named them all. This one does," said Beta Mahatvaraj. The collection ranges from commonly recognised carps and catfish to native species that have barely been recorded elsewhere.

Beyond identification

The field guide distinguishes between indigenous species and introduced fish, documenting which belong to the region's natural ecosystem. It also tracks losses driven by pollution and disappearing habitat, providing a baseline for understanding the ecological pressures facing Chennai's waterbodies.

The book explores the cultural dimension of the city's relationship with fish, including their presence and significance in ancient Tamil literature. This dual approach—combining practical field identification with cultural context—reflects Chennai's long connection to freshwater fish that extends beyond consumption or commerce.

The publication was timed for Madras Day on Saturday, linking contemporary conservation awareness to the city's historical identity.

Source: The Hindu