Last year, 69 pollution incidents involved slurry leaking into waterways
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The latest check on Northern Ireland's rivers suggests pollution remains a major problem despite a reduction in reported incidents.
The figures, contained in the annual report by the Fisheries Conservancy Board, detail 212 pollution incidents last year, down from 271 the year before.
The board identifies farmers as the worst offenders with chemicals, slurry and sewage causing the most problems.
The pollution of local waterways remains commonplace, with the board confirming an average of four incidents a week.
It is thought pollution may be even more widespread than the figures suggest.
The Conservanacy Board points to slurry as a growing problem.
Millions of gallons of liquid manure are produced on farms as a fertiliser.
Last year, 69 pollution incidents involved slurry leaking into waterways.
Even more deadly is silage effluent which robs rivers of oxygen and can kill off aquatic life for miles downstream.
There were 76 confirmed pollution incidents involving silage effluent.
Non-agricultural related pollution accounted for 12 incidents, including 3 involving sewage from water service treatment works.