„…the sample of fish from the Elbe … exceeded the hygienic standards for foodstuffs for polychlorinated biphenyls and dioxins, and has also exceeded the environmental water quality standard for perfluorooctane sulfonate and polybrominated diphenyl ethers.“ /Source – CZ/

Thymallus Thymallus

The grayling is known as the ‚lady of the stream‘. In Europe, they used to be persecuted by anglers for the false perception that they stopped trout colonizing stretches of rivers and streams. However, research has shown that grayling and trout feed on different prey items and generally prefer different microhabitats within rivers and streams but do occupy similar niches to smaller, less-predatory trout. /Source/

Gymnocephalus cernuus

Gymnocephalus cernuus are small, reaching up to 20cm in length, with olive brown colouring on the back and pale sides. They have spiny dorsal and anal fins. G. cernuus can tolerate a wide range of ecological and environmental conditions. They are found in fresh and brackish water (with salinity up to 12ppt) and occur at depths varying from 0.25m to 85m. they are also able to thrive in eutrophic conditions (Hajjar, 2002). /Source/

Salmo trutta fario

Salmo trutta fario, sometimes called the river trout, and also known by the name of its parent species, the brown trout, is a predatory fish of the family Salmonidae and a subspecies or morph of the brown trout species, Salmo trutta, which also includes sea trout (Salmo trutta trutta) and a lacustrine trout (Salmo trutta lacustris). Depending on the supply of food, river trout measure 20 to 80 cm in length; exceptionally they may be up to 1 m long and weigh up to over 13 kg. Their back is olive-dark brown and silvery blue, red spots with light edges occur towards the belly, the belly itself is whitish yellow. River trout usually attains a weight of up to 2 kg. They can live for up to 18 years. /Source/

Barbus barbus

Inhabits from premontane to lowland reaches of clear, warm, medium sized to large rivers with fast current and gravel bottom. Occasionally found in lakes. Frequently overwinters in large group, inactive or active in slow-flowing river habitats. Adults often form shoal, hiding under overhanging trees or bridges during the day. Adults are encountered most active during dusk and dawn while larvae and juveniles are active during both day and night. /Source/

Abramis brama

Undergo upriver migration (100 km in Dniepr) to spawn. Many populations start spawning migration in autumn ( especially semi-anadromours forms), slow down during winter and continue in spring. Males often defend spawning territories along shorelines. Eggs are sticky and eggs size increases with age of female. /Source/