In France, green algae is proliferating in Brittany's Morlaix Bay, fed by farm waste and nitrogen fertilizers. Among the numerous consequences, oysters farmed in the bay are threatened.

Brittany

Oyster farmers in Morlaix Bay, Brittany, are contending with increasing outbreaks of green algae, which are impeding oyster growth and threatening the local industry. The thick mats of algae can rot on the oysters, killing them and requiring farmers to spend extra time managing the problem.

Environmentalists attribute the algae blooms to nitrogen runoff from livestock farming, particularly in Brittany, a major pork-producing region. Combined with rising water temperatures, these factors create ideal conditions for the algae, endangering both the oyster industry and the broader local economy.

France: Green algae threatens oyster industry in Brittany

In Morlaix Bay, oyster farmers are overwhelmed by green tides. Algae blooms are proliferating, and it's a real cause for concern. The mass of green algae that grows thick on the oysters hinders their growth. Because the algae is so thick, it starts to putrefy, to rot. When the algae rots, when it rots on the oysters, it kills everything. Marc Le Provost is an oyster farm manager, and for over a year, he's been warning about the threat posed by the algae blooms to oyster production in the bay. If it continues to increase like it is today, in 10 or 15 years, oyster farming won't be viable in a bay like this. So the industry risks disappearing. It's not just one or two businesses that are affected by algae. It's really the whole economy, not to mention tourism. These green tides also generate thousands of hours of additional work for the oyster farmers, who are forced to re-suspend the algae in the water to prevent it from rotting on the seabed and suffocating the oysters. Environmentalists blame the nitrogen fertilizer used in raising livestock for causing the green tides. Brittany is the sixth largest pork-producing region in Europe, and home to more than six and a half million pigs. It's the runoff from the farm waste and fertilizers that end up being carried by the rivers. Couple that with warming water temperatures, and conditions are just right to fuel these devastating algae blooms.

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