Neretva, and its Rama Lake received an unknown quantity of this allochthonous species. Population estimates have increased in the Neretva accumulation lakes. This fact confirms previous scientific assumptions of Škrijelj (1991, 1995), who predicted the possibility of pike perch displacement (migration) from Ramsko Lake to the Rama River and then further downstream to the river and its lakes. In 1990 the perch population made up 1.95% of the fish population in Rama Lake. Within a decade this rose to 25.42% in the nearby Jablaničko Lake. The fast pace of pike perch population growth and displacements is expected to match the environmental conditions from the mid-ecological valence of this fish. In this sense, it is the established continuous and accelerated growth of the population dynamics of pike perch in Jablaničko Lake, a relatively good representation in Salakovačko Lake and the beginning of growth of population in Grabovičko Lake. Parallel with the increase in pike perch is a decrease in endemic indigenous species like European chub also white chub (Squalius cephalus), and the disappearance of rare and endemic species like Adriatic Dace also Balkan dace (Squalius svallize also Leuciscus svallize Heckel & Kner 1858), Neretvan softmouth trout (Salmothymus obtusirostris oxyrhinchus Steind.) and marble trout (Salmo marmoratus Cuv.). Pike perch causes clearly visible, negative effects on the autochthonous species in Jablaničko Lake. In Salakovačko Lake these effects are in progress, although less visible, while in Grabovičko Lake it is not yet clearly visible. Salmonids Salmonid fish from the Neretva basin show considerable variation in morphology, ecology and behaviour. Among most endangered are three endemic species of trout: Neretvan softmouth trout (Salmothymus obtusirostris oxyrhinchus Steind.), Toothtrout (Salmo dentex) and marble trout ((Salmo marmoratus Cuv.). All three endemic trout species of the Neretva are endangered, mostly due to the habitat destruction or construction of large/major dams ("large" is higher than 15–20 m; "major" is over 150–250 m). Other problems include hybridization or genetic pollution with introduced, non-native trouts, illegal fishing and poor water and fisheries management. Cyprinids The most endangered cyprinids (family Cyprinidae) are endemic. Especially interesting are five Phoxinellus (sub)species that inhabit isolated karstic plains (fields) of eastern as well as western Herzegovina in Bosnia and Herzegovina, which eventually reach the Neretva watershed and/or coastal drainages of south-eastern Dalmatia. Karst minnow (Phoxinellus metohiensis) is considered Vulnerable (VU). South Dalmatian minnow (Phoxinellus pstrossii) is threatened, but was marked Data Deficient (DD) and was not designated