. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. THE BLACK SEA 459 of bullheads (among them Mesogobius batrachocephalus, M. gymnotrachelus, Neogobius rata, N. platyrostris, N. syrman). Krotov (1949) traces a connection with later immigrants from the Caspian Sea: the Acipenseridae (Huso huso, Acipenser guldenstradti, A. stellatus, A. nudiventris and A. ruthenus), Clupeidae (Caspialosa kessleri pontica, ? brashnikovi maeotica, ? caspia nordmanni, ?. ?. tanaica, ?. ?. paleostomi), salmon (Salmo trutta labrax), Benthophilus Benthophilus macrocephali
. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. THE BLACK SEA 459 of bullheads (among them Mesogobius batrachocephalus, M. gymnotrachelus, Neogobius rata, N. platyrostris, N. syrman). Krotov (1949) traces a connection with later immigrants from the Caspian Sea: the Acipenseridae (Huso huso, Acipenser guldenstradti, A. stellatus, A. nudiventris and A. ruthenus), Clupeidae (Caspialosa kessleri pontica, ? brashnikovi maeotica, ? caspia nordmanni, ?. ?. tanaica, ?. ?. paleostomi), salmon (Salmo trutta labrax), Benthophilus Benthophilus macrocephali magistri and B. stellatus), Benthophiloides brauneri,. Fig. 221. Diagram of estuary of river Danube (Carausu, 1943). Localities where biological samples were taken. Caspiosoma caspium, some species of bullheads (Neogobius melanostomus, N. cephalarges, N. kessleri, N. fluviatilis and Proterorhinus marmoratus) and the stickleback Pungitius platygaster; no fewer than 39 species in all. Most of the Black and Azov Sea fish are immigrants from the Mediterranean after the Dardanelles break-in. They comprise 60 per cent of the whole Black Sea and Azov Sea ichthyofauna, including the fresh-water fish. In the Black and Azov Seas the process of species evolution also involved a number of fish of Mediterranean origin such as anchovy, with its Black Sea and Sea of Azov sub-species, the brill, garfish, red mullet and others. A number of fish which enter the Black Sea from the Mediterranean may also breed there (mackerel, Sarda). It has been proved by Wodjanitzky (1940) that. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Zenkevich, L. A. (Lev Aleksandrovich), 1889-1970. New York, Interscience Publishers
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