Other salt-tolerant fish species were intentionally or inadvertently introduced during the 1960s when hydropower and irrigation projects reduced the flow of fresh water thereby increasing salinity. These include the Baltic herring (Clupea harengus membras), big-scale sand smelt (Atherina boyeri caspia), black-striped pipefish (Syngnatus abaster caspius), Caucasian dwarf goby (Knipowitschia caucasica), monkey goby (Neogobius fluviatilis), round goby (N. melanostomus), Syrman goby (N. syrman), bighead goby (Ponticola kessleri), tubenose goby (Proterorchinus marmoratus), grass carp (Ctenopharyngodon idella), silver carp (Hypophtalmichthys molitrix), bighead carp (H. nobilis), black carp (Mylopharyngodon piceus), and northern snakehead (Channa argus warpachowski).
Other salt-tolerant fish species were intentionally or inadvertently introduced during the 1960s when hydropower and irrigation projects reduced the flow of fresh water thereby increasing salinity These include the Baltic herring (Clupea harengus membras) big-scale sand smelt (Atherina boyeri caspia) black-striped pipefish (Syngnatus abaster caspius) Caucasian dwarf goby (Knipowitschia caucasica) monkey goby (Neogobius fluviatilis) round goby (N melanostomus) Syrman goby (N syrman) bighead goby (Ponticola kessleri) tubenose goby (Proterorchinus marmoratus) grass carp (Ctenopharyngodon idella) silver carp (Hypophtalmichthys molitrix) bighead carp (H nobilis) black carp (Mylopharyngodon piceus) and northern snakehead (Channa argus warpachowski)