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Parasites of the invasive Chinese sleeper Perccottus glenii (Actinopterygii: Odontobutidae) in the region of the first introduction of the Carpathian population

Kvach Yuriy, Kutsokon Yuliya, Janáč Michal, Dykyy Ihor, Dzyziuk Natalia, Dudliv Ivanna, Nazaruk Kateryna

Oceanological and Hydrobiological Studies

2022

Vol. 51, No. 1

1--9

Parasites of the invasive Chinese sleeper (Perccottus glenii) were studied in five different localities at the site of the first introduction of the Carpathian population of this fish. We recorded eight taxa of parasites in Lviv water bodies. The monogenean Gyrodactylus perccotti and the cestode Nippoteania perccotti were recorded in all five lakes studied. These parasites represent Far East species introduced together with their host. Also the copepod Neoergasilus japonicus is a Far East parasite introduced to Europe with its aquaculture vector. Differences between the surveyed bodies of water were mainly related to their local seasonal conditions and watershed characteristics. The current data confirm the presence of co-introduced populations of G. perccotti and N. perccotti, which probably affects the future invasiveness of their host. Due to low acquisition of local parasites, we cannot confirm any significant effect of invasive fish on local parasite assemblages in this region. However, the presence of the non-indigenous copepod, N. japonicus, requires additional attention in the future.

First record of the rare crab Asthenognathus atlanticus Monod, 1933 (Crustacea: Brachyura: Varunidae) in the North Sea

Faasse Marco, Gheerardyn Hendrik, Witbaard Rob, Cuperus Joël

Oceanological and Hydrobiological Studies

2021

Vol. 50, No. 3

352--358

Several species new to the area were collected while monitoring Dutch marine waters using a dredge. The varunid crab Asthenognathus atlanticus Monod, 1933 was recorded for the first time in the North Sea. Until 2008, this relatively rare crab was known from the west coast of Africa and the western Mediterranean to northern Brittany in the north. In recent years, its distribution range has expanded, as indicated by records from the Bay of the Seine and the area around Dieppe-Le Tréport. Our finding from Brown Bank (southern North Sea) indicates a further, northward expansion of its distribution range. We list the hosts with which the crab is associated. Earlier arguments for climate change as an explanation for the northward range expansion are supported.

The first record of Litarachna duboscqi Walter, 1925 (Acari, Pontarachnidae) outside the Mediterranean Sea

Zawal A., Pešić V.

Oceanological and Hydrobiological Studies

2015

Vol. 44, No. 3

426--429

A single female of Litarachna duboscqi Walter, 1925 was collected on the coast of the island of Tenerife (Canary Islands) extending the currently known distribution of this species by more than 2000 km southwestward into the eastern Atlantic.