Assessing the diversity of mangroves in the Nayaru Lagoon, Nayaru Lagoon © Kumudini Ekaratne, IUCN SL, 2014
Mangrove vegetation distribution, fishery and water quality in Nayaru lagoon assessed for sustainable management of lagoon ecosystem.
Acquisition of high-resolution acoustic data (bathymetry) and compilation of a detail bathymetric map of the lagoon.
Distribution pattern of the filamentous algal mat in the lagoon assessed.
Physicochemical parameters of lagoon water (pH, Salinity, Dissolved Oxygen, Phosphates ad Nitrates) assessed.
Mangrove and lagoon ecosystems in the north and east coasts of the country have not been scientifically exploited for the last 30 yrs due the war situation prevailed in the area. However, with the return of peace to the country the areas are now accessible to the scientific community and hence it’s our duty to evaluate the present status of these ecosystems and make available the information generated to the wider audience.
The lagoon is approximately 300ha in extent. A wide lagoon mouth is located at the southeastern part of the lagoon. Nay Aru and Palidai Aru are the main freshwater sources to the lagoon. Nay Aru and Palidai Aru open to the lagoon from its western side.
Mullativu – Kokilai road runs parallel to the eastern border of the lagoon. Eastern shore of the lagoon supports very little mangrove cover, while well developed mangrove cover is seen in the southern and western shores of the lagoon.
Lagoon fishery is the main livelihood of the people living in Chenmalai and Kumulamunai villages.
Nayaru Lagoon was surrounded by a well developed mangrove and reported to have been supporting a rich prawn fishery. The lagoon also served as very important water bird habitat. However, the recent development activities in the lagoon area have resulted in clearing some mangrove patches and constructing a narrow bridge over the lagoon month. This has lead to the hydrological changes in the lagoon which may lead to the collapse of the lagoon fishery and decline of the mangrove vegetation cover around the lagoon. Lack of recent and reliable ecological information on the lagoon ecosystem prevents the authorities to assess the ecological and economical importance of the lagoon.
The proposed project will collect up to date information on these issues which could then be used by the relevant authorities to make vital decisions for the wise management and sustainable utilization of this lagoon ecosystem.
1) Survey of mangroves
2) Survey of lagoon fishery
3) Survey of threats
4) Recording the distribution of the algal mat in the lagoon using GPS and mapping
5) Analysis of physicochemical parameters of lagoon water
6) Establishment of a system for regular consultation with the stakeholders
7) Conducting an awareness programme for fisher and farming community
Community living around the Nayaru Lagoon, decision makers.
1) List of true mangrove species and mangrove associates
2) Map showing the mangrove cover around the lagoon with estimates of extent of the mangrove
3) List of fin fish and shellfish species harvested and their price ranges
4) Report on recommended fishing methods/gear and lagoon fishery regulations
5) Report on threats to the lagoon
6) Bathymetric Map of the lagoon
7) Map showing the distribution of the filamentous algal mat
8) Report on the lagoon water quality and possible sources of nutrient loading
The project was successfully completed.
Conservation priorities and regulatory activities of the lagoon ecosystem were identified during the study and they conveyed to the relevant authorities (such as the Forest Department and the Fisheries
The project will contribute to the overall biodiversity conservation effort of the country. Protecting the mangrove forest cover is important as the mangrove species will also serve as a sink of atmospheric CO2 .
Findings of the project will be communicated to a wide range of audience including scientific communities and decisions makers.
26th Dec 2013 to 25th Nov 2014
Grantee: LKR 300,000.00
Ecological Association of Sri Lanka(EASL)Mr Ranjith KulasekeraSecretaryEASL172, Bogahatenna, Udaperadeniya, Peradeniyaemail: email@example.com