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Water hyacinth resurges in Ooty lake amid ecological concerns

Less than two years after a major cleanup operation, invasive water hyacinth has returned to blanket large portions of Ooty lake in Tamil Nadu. The resurgence has coincided with a sharp decline in the region's bird population, raising questions about the ecological impact of the previous remediation efforts.

LSN India · 5 October 2026

Water hyacinth resurges in Ooty lake amid ecological concerns

The picturesque Ooty lake is facing renewed environmental challenges as water hyacinth has rapidly recolonized significant areas of the water body, reversing gains from a cleanup drive completed in late 2022. Local ornithologists have documented a marked deterioration in avian diversity and population numbers since the earlier intervention, pointing to ecological disruption as a possible cause.

Bird watching groups monitoring the lake have attributed the decline to the methodology employed during the previous cleanup operation. The initiative reportedly resulted in the destruction of critical natural features including sand banks and reed beds—habitats that had become essential for the lake's resident and migratory bird populations.

These natural formations serve as breeding, nesting, and feeding grounds for numerous species that depend on the lake ecosystem. Their removal has left birds with diminished resources, contributing to the observed population reduction across multiple species.

The renewed infestation of water hyacinth underscores the complexities of lake restoration projects. Environmental experts have long cautioned that cleanup efforts must be carefully designed to preserve existing ecological functions rather than focus solely on removing visible problems. The situation at Ooty lake highlights the need for more scientifically-informed and comprehensive approaches to managing invasive aquatic vegetation while maintaining habitat integrity for dependent wildlife populations.