Environment agency Sepa said every part of the country had now reached some level of water scarcity. The weather conditions could last until early July and followed a drier than usual winter and spring. In May, Scotland only received 44% of its long-term average rainfall.
Scientists said the critically-endangered species had previously only been found in rivers and know pearl mussels have been discovered in the Scotland Lochs.
Scottish Water says storage levels at some sites are at 66% amid one of the driest summers in 160 years.
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