engleski

Native and non-native fish translocations in Croatia: €h Danube and Adriatic basins

Due to hydrogeological features of Croatia, the country is divided into a Pannonian and a karst part that include two basins, namely the Danube and the Adriatic, with the former being dominated by the large rivers Sava, Drava and Danube plus their smaller sub-basins. The rivers of the Adriatic Basin are short and isolated, and often flow through deep canyons where they create waterfalls and lakes. Also, they are connected with a number of small streams and underground watersheds. The freshwater ichthyofauna of Croatia is diverse and includes a total of 150 riverine species of which 21 are found in brackish and salt waters. Croatia’s ichthyofauna is also rich in endemic species, with 38 present in the Adriatic Basin and 12 in the Danube Basin. In total, 28 alien $sh species were introduced in Croatia, 32 were translocated from the Danube to the Adriatic basin (18 native and 14 non-native) and 2 from the Adriatic to the Danube basin (1 native and 1 non-native). First known translocation, excluding carp, date back to the 18th century when pike (Esox Lucius) and tench (Tinca tinca) were translocated to the Lake Vrana located on the Island Cres. Reasons for translocations in Croatia were 1) accidental: during translocation of other $sh species (e.g. pumpkinseed) and 2) intentional: angling, to fill empty niche, for general improvement of fisheries and aquaculture. Most of translocated species naturalized in their new habitat. Researches on impact of translocated species in Croatia are entirely absent.

translocation ; Adriatic basin ; karst area ; invasive species

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