A rally has been held at Lough Neagh over the environmental crisis facing the largest freshwater lake in Ireland and Britain.
Blue-green algae returned to Lough Neagh in the centre of Northern Ireland this week for the third summer in a row, with some describing the current levels as the worst they have seen.
An overpowering smell from the algae was noticeable at Battery Harbour in Cookstown, near a popular campsite.
Local residents, swimmers and fishermen attended the demonstration today organised by the Save Lough Neagh coalition.
Protesters called for five demands to be met during the rally at the Fionn Mac Cumhaill statue on the shores of the lough in Antrim.
They want fines and penalties for "major polluters"; a well-funded public water service; an end to the exploitation of Lough Neagh through sand-dredging; investment into research and recovery actions for the lough; and protections for the natural environment.
Nitrogen and phosphorus from agricultural fertiliser running off fields and from wastewater treatment are said to be a contributory factor in the blue-green algae blooms.
The spread of the invasive zebra mussel species is also understood to have played a role in the blooms because they have made the water clearer, allowing more sunlight to penetrate, stimulating an increase in algal photosynthesis.
Climate change is another factor as water temperatures rise.
The condition of the lough has resulted in the eel-fishing season to be cut short this summer.
The blue-green algae has also spread to other waterways, causing two north coast beaches to close for bathing at the weekend.
Last week, Agriculture, Environment and Rural Affairs Minister Andrew Muir said he was "determined to turn the situation around", and the Stormont Assembly has agreed to a Lough Neagh action plan.
However, the protest was told that the agreed action plan does not go far enough and Mr Muir needed to "put the environment first for once".
The local fishing group Western Shore Angling said more locals needed to attend protests about Lough Neagh.
"Unfortunately, the people who are shouting from the rooftops and commenting underneath every post about the situation failed to show up and attend," they said in a post on Facebook.
"It was the same old faces, as the saying goes, and that simply isn't good enough.
"Positive change will only happen if everyone is behind the wheel, pushing it forward for the greater good and future generations."
