A community based initiative in Sri Lanka to keep our natural environment clean

Thalangama Wetland Watch

The Thalangama Area


  1. Mafaza Fara from Horizon Campus, Malabe, started in March 2019 her BSc research on water quality effects on fish diversity and distribution in Colombo wetlands, taking the Diyasaru park at Thalawathugoda, and the Thalangama lake as case studies. Aside water sampling and the analysis of water quality parameters, Mafaze will have to catch fish (with a net) and immediately release them back into the water after identification. Compared with the Diyasaru wetland, much fewer fish species were recorded in the Thalangama lake. “Tilapia” appears now the most common species which can live under certain oxygen conditions, and will be affected if the lake undergoes further maintenance measures that will decrease the already low dissolved oxygen levels in the water.

  2. Nuwanthika Dharmaratne from the University of Colombo is studying water quality changes in five wetlands of Colombo, including the Thalangama Lake. One photo shows her and her team colleague in action, the other some of the aquatic macro invertebrates (snails, insects, etc.) which are bio-indicators for different levels of water quality. Nuwanthika is also looking at birds and dragonflies next to a set of chemical and physical water characteristics, as well as disturbance factors. She says: “I want to check the co-relations between all of these factors to determine those which could most closely reflect wetland quality”.

  3. The “Nature Beyond the Horizon” environmental society of the Horizon campus is working on a regular bird monitoring as one of their activities. The contact is natbeho@horizoncampus.edu.lk

  4. The Sri Lankan NGO ‘People To People Volunteers’ supports in the Thalangama lake area the conservation of bio-diversity with funding from UNDP GEF. One of their activities serves the promotion of organic vegetable cultivation on the bushy ‘highlands’ (ovita) within the paddy fields. Other activities support, for example, dairy farmers. The contact is Mr Anuradha Prabath Kumara.