Pearl mussels feed on plant detritus, small particles of organic mass of plant origin, which they filtrate from water. The source of detritus are water plants and grasses of surrounding meadows. From them, the organic mass gets into watercourses with groundwater or by leaf fall. Because, also due to human interventions in the past, there are few natural streams that would collect food for pearl mussels, artificial food brooks are being created in the localities where pearl mussels occur. These have to be checked regularly and restored to the original width because they gradually get clogged and overgrown. We started off the complete regeneration of the food brooks on Lužní and Bystřina streams this spring.
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