Hello,
the anwer is they prefer 'sewage water'
this is because this is their habitat they are adapted to it
Mayfly larvae are primarily freshwater organisms and are not adapted to live in saltwater environments. They typically inhabit clean, well-oxygenated rivers and streams. While some aquatic insects can tolerate brackish water, mayflies do not have the physiological adaptations necessary to survive in seawater. Therefore, mayfly larvae cannot thrive in marine environments.
The larva of a mayfly is commonly referred to as a "naiad." Naiads are aquatic and typically live in freshwater environments, where they undergo several molts before emerging as adult mayflies. These larvae are important indicators of water quality and are often found in clean, oxygen-rich waters.
Mayflies are highly sensitive to water quality, and their larvae require clean, oxygen-rich environments to thrive. Polluted water often contains harmful substances, like heavy metals and excessive nutrients, which can disrupt their growth, reproduction, and overall survival. Additionally, pollutants can reduce oxygen levels, making it difficult for mayfly larvae to breathe and develop properly. As a result, the presence of mayflies is often an indicator of a healthy aquatic ecosystem.
It is a treatment plant which turns sewage water into clean water
no some fresh water has sewage in it
Sewage
The water is clean, and well oxygenated.
Make sure the sewage pipe is in good repair and has NO leaks then extend it to a facility where the sewage can be treated (turned into good water by mixing it with air to let the good bacteria break down the sewage). It is possible to turn sewage into harmless, good products and to make the water clean again. This is a natural process (otherwise all the water on earth would be bad) and it is possible to make this process happen faster using waste treatment methods.
There are no exact products for sewage spill . Mainly people have come up with tons of ways to clean up and stop it for happening.
By disconnecting it from the piping , clean it off and look at the manufacturers tag
Close the affected area and clean it.
Bloodworms, the larvae of midge flies, possess a unique adaptation that allows them to thrive in low-oxygen environments. They can tolerate high levels of pollution and have a hemoglobin-rich blood that efficiently binds and transports oxygen, enabling them to survive where oxygen levels are depleted. In contrast, mayfly nymphs are more sensitive to water quality and oxygen levels, making them less capable of enduring polluted conditions. Their physiological requirements for clean, oxygen-rich water limit their survival in such environments.