Mass Fish Die-off in the Noorderzijlvest Area
There are currently several locations throughout the entire Noorderzijlvest Water Authority area Noorderzijlvest Water Authority large-scale fish mortality has been observed. This applies to both watercourses rural areas and ponds in urban areas. Oxygen depletion caused by the severe weather last weekend, combined with the high temperatures of the past week, has led to this mass die-off. The water authority with external parties to remove the dead fish.
Severe weather is a major cause
Last weekend, severe storms Noorderzijlvest Water Authority through the Noorderzijlvest Water Authority area. Due to the large amount of rainfall in a short period of time, many sewer overflows occurred. This led to a decrease in oxygen levels in ponds, canals, ditches, and lakes. Combined with last week’s high temperatures and the extent of vegetation growth in a number watercourses , this watercourses led to oxygen levels in the water falling too low, resulting in significant fish mortality.
Fish Mortality Is Declining
With the current lower temperatures and the inflow of oxygen-rich water from the major watercourses our water system, oxygen levels in smaller bodies of water and in the polders will rise. This will lead to a decrease in fish mortality.
Fish Cull
The water authority currently water authority with external parties to remove the dead fish. This work is expected to take a few more days. If you notice areas with a large number of dead fish, the water authority asks that you do not remove water authority dead fish yourself, but instead contact the water authority 050-3048911. The water authority the situation.
Previous report of dead fish in Hoornsegraft
Last Saturday, June 27, a report was received of a large number of dead fish in the Hoornsegraft in Groningen. An enforcement officer visited the site and measured the oxygen level in the water. These measurements showed that the oxygen level was normal. The water quality and flow were also checked. The deeper part of the watercourse clean and clear. The dead fish were removed last Monday.