That’s the reason it got here as a little bit of a shock to the biologists on the Danish Environmental Safety Company when on Monday there have been stories of 1000’s of lifeless fish that had washed up on the coast east of Thisted.
– It was a tragic sight on the morning stroll, says Susanne Rugaard Bruun, who noticed the big shoals of fish from the trail beneath Johnsens Allé, simply east of Thisted Harbor and the city’s sewage remedy plant.
She prolonged the stroll to see the extent of this fish kill. And was capable of verify that fish had additionally washed in on the opposite facet of Thy Cablepark, greater than a kilometer additional to the east.
A minimum of on massive elements of this stretch there weren’t simply numerous lifeless fish. The underside of the fjord was additionally lined with a layer of small jellyfish, says Susanne Rugaard Bruun.
Biologist Mikael Hjorth Jensen from the Environmental Safety Company Funen, who displays the marine space, doesn’t instantly have any clarification for both the in depth fish demise – or why the lifeless fish seem along with jellyfish in massive numbers.
– I’ve not heard of jellyfish being linked to fish deaths earlier than, he says.
On the premise of the photographs he has seen of the lifeless fish, Mikael Hjorth Jensen believes that it’s most definitely herring, which, as is well-known, seem in massive shoals.
Oxygen loss was due to this fact not measured when the Danish Environmental Safety Company visited this a part of the Limfjord final week. However even when the current cool and windy summer season climate ought to contribute to the fjord not gasping for climate, Mikael Hjorth Jensen doesn’t need to rule out that pockets of low oxygen content material might happen regionally.
– Usually, a college of fish will transfer away from an space of oxygen depletion. However you’ll be able to properly think regarding that they’d not have been capable of get away if such a mass of water is pushed in the direction of land, he says.
Oxygen depletion is usually related to massive algal blooms. Or extra exactly, it’s the lifeless algae that use the oxygen following they sink to the underside. And on the Danish Environmental Safety Company’s sampling in a. Thisted Bredning final week a big focus of algae was measured.
– However the algae may make balls themselves, if it is likely one of the poisonous species, or in the event that they happen in massive portions, Mikael Hjorth Jensen factors out.
On Friday final week, fishermen have been additionally capable of inform the Environmental Safety Company regarding lifeless lobsters in cabin barrels and tiles at a location west of Mors. Whether or not it’s associated to the lifeless fish at Thisted is just not identified.
In any case, individuals from the Danish Environmental Safety Company are anticipated to return to Thisted later this week to seek out out extra in regards to the fish demise.
2024-06-17 15:14:04
#Thriller #lifeless #fish #coast #Limfjorden
