Croatia - 2025 Croatian Fauna - Freshwater Fish - Set of 3 (MNH)
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2025 Croatian Fauna - Freshwater Fish - Set of 3 (MNH)
The brown trout (Salmo trutta) (Linnaeus, 1758) lives in rivers and streams of the Danube and Adriatic basins, as well as in lakes in its lake-dwelling form. The lake trout is considered a form that developed under the influence of a specific type of habitat and is regarded as a single species. The body is elongated and spindle-shaped, covered with small, round scales. The mouth is large, and the teeth are well-developed. Its back has black spots with white edges, while its sides feature red spots outlined in white or light blue.
The common carp (Cyprinus carpio) (Linnaeus, 1758), in its original form, is today one of the most endangered fish species in Europe. In the Republic of Croatia, it is endangered in the Danube basin, while in the Adriatic basin, it has been introduced and is not considered endangered (it also lives in brackish waters). It inhabits rivers and standing waters with sandy and muddy bottoms, as well as dense aquatic vegetation, with water temperatures ranging from 10 to 30°C being most suitable for it. It has a robust body, with horizontal mouth openings and two pairs of barbels, with the barbels at the corners of the mouth being longer.
The European catfish (Silurus glanis) (Linnaeus, 1758) inhabits the Danube basin and has also been introduced into the Adriatic basin, preferring calm areas with slower water flow, while not requiring high levels of dissolved oxygen in the water. During the day, it mostly rests in deeper areas or shelters made of aquatic plants and branches, as well as under roots along steep banks, while being active at night. Its eyes are very small, which indicates its nocturnal activity, although it also moves during the day when the water is stirred up and becomes murky. It is known that the catfish will search for food during summer storms, heavy rain and thunderstorms, moving even in the strongest water currents, and it will also venture into shallower areas.