 However, this was found to not be too deleterious, as it did not seem to affect the passage of migratory fish.In fact, because of the stations' introduction of warm water into the river, basking sharks were known to be attracted to the area.From the start, the power stations' fly ash was dumped in the North Sea, and 800,000 tonnes of fly ash were dumped between the Stella and Blyth stations in 1976.