Parasites of Non-Native Bream, Abramis brama (Linnaeus, 1758) (Actinopterygii: Cyprinidae) in Great Siberian Rivers: New Data and Review

Bream, Abramis brama (Linnaeus, 1758) is an economically important species of cyprinid fish of the Palearctic. Primarily absent in Siberia (Asian Russia) this species is introduced into these regions and now is quite common in Western and Eastern Siberia. The available literature data on bream parasites of the great Siberian rivers, Ob, Yenisei and Lena are summarized and compared with the results of own researches. A total of 48, 31 and 15 parasite species have been recorded for the bream in these three river basins, respectively. Common species for all three basins are Myxidium rhodei, Dactylogyrus crucifer, Tylodelphys clavata, Diplostomum spp., Rhipidocotyle campanula and Phyllodistomum elongatum. The difference in the number of parasite species found is largely due to the poorly studied parasite fauna of the bream in the basins of the Yenisei and Lena. In the basins of the Ob and Yenisei, the host-specific monogeneans and myxozoan, Dactylogyrus zandti, Gyrodactylus elegans, Diplozoon paradoxum and Myxobolus rotundus (in both basins), Dactylogyrus falcatus, Dactylogyrus wunderi (the Ob River basin) and Dactylogyrus auriculatus (the Yenisei River basin) were found in this fish species. The registration of these parasites in the Yenisei River basin does not agree with the prevailing opinion about Lake Ubinskoye (Western Siberia) as the only donor reservoir for the introduction of bream to Eastern Siberia. Introduced bream in Siberian reservoirs is infected with opisthorchiid digeneans, which are dangerous for humans.