Alburnus leobergi

<em>Alburnus leobergi</em> is a brackish-water fish in the family Leuciscidae, distinguished among the bleaks by its tolerance of saline and brackish conditions. This species is found in the Caspian Sea region and associated coastal waters, where it likely inhabits estuarine and near-shore brackish zones as well as lower river reaches that transition from fresh to brackish water. It is a slender, silvery fish with a laterally compressed body and a slightly upturned mouth characteristic of the genus. <em>Alburnus leobergi</em> is notably larger than many of its relatives, with specimens reaching a maximum recorded length of approximately 40.3 cm, making it one of the more sizeable members of the genus <em>Alburnus</em>. It likely feeds on invertebrates, surface insects, and small fish in the water column. Details of habitat and range for this species remain limited in the ichthyological literature beyond its general Caspian basin association. Its conservation status has not been formally evaluated by the IUCN. Understanding the ecology and distribution of this brackish-tolerant bleak may have relevance to broader studies of Caspian Sea ichthyofauna.