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Aquatic macrofauna are visible to the naked eye and includes invertebrates such as beetles, snails and dragonfly larvae. Aquatic macrofauna constitutes a very rich group of animals, whose respresentatives are found in all water types. 

Many species of macrofauna have specific environmental requirements meaning that this group is an ideal group to be used as indicators of the ecological condition of the water and sediment.

Protected species
A number of species are protected under wildlife legislations. This includes rare species such as European crayfish (Astacus astacus), the diving beetles Dytiscus latissimus and Graphoderus bilineatus, thick-shelled river mussel (Unio crassus) and the larvae of many dragonfly species. These species must be taken into account during work affecting their habitat. The presence of these species and possible measures can be identified through quick scans.