Pseudorasbora parva (Stone moroko)

In the moats, parasitic crustaceans were found in stone moroko, Carassius auratus langsdorfii, Carassius cuvieri and in some shrimps.

Stone moroko (also known as topmouth gudgeon), Pseudorasbora parva, is a fish belonging to the Cyprinid family, native to Asia, but introduced and now considered an invasive species in Europe.

Topmouth gudgeon (Pseudorasbora parva)

The invasive fish, the Asian topmouth gudgeon, was introduced into ponds near the Danube in Romania in 1960 and has since spread rapidly throughout Europe.

Stone moroko (also known as topmouth gudgeon), Pseudorasbora parva, is a fish belonging to the Cyprinid family, native to Asia, but introduced and now considered an invasive species in Europe.

It was first discovered in the United States in association with invasive species including topmouth gudgeon but was found to be the causative agent of a disease in the UK affecting salmonid species such as Atlantic salmon and brown trout.

They pose danger to another species such as the sunbleaks (Leucaspius delineatus), as they are the carrier of a parasite (Sphaerothecum destruens) which while not damaging to the topmouth gudgeon, attacks other fishes like the sunbleaks, which are unable to spawn and have a higher mortality when infected.