The algae can be harmful to both people and animals, Hull City Council officials say.
The alert follows reports a young pet died shortly after a visit to Coniston Water.
Rights of Nature could give Lough Neagh the same status as a person, entitled to the same protections.
Rangers in Surrey have found what is suspected to be blue-green algae in Frensham Great Pond.
Ecologists say the warming is "part of a long-term shift that requires our attention and action".
The Environment Agency says the algae, also found in a flood channel, is toxic to people and pets.
The Environment Agency said the algae is toxic to people and pets.
Campaigners gathered at several locations around Lough Neagh to come together to 'Sing for the Lough'.
The QUB team says it is the first time several techniques have been combined to analyse the effect.
