Toad goby
 Mesogobius batrachocephalus the Knout goby or Toad goby is a species of goby native to the Black Sea and the Sea of Azov where it can be found in estuaries and brackish water lagoons (rarely venturing into fresh waters). Prefers areas near cliffs with sandy shelly or rocky substrates at depths of from 20 to 60 metres (66 to 197 ft) occasionally down to 100 metres (330 ft). This species is a piscivore.