STRUCTURE PECULIARITIES OF PACIFIC SALMON OVARIESAND PROBLEMS OF THEIR EVOLUTION
The structure of salmon ovaries was studied. It is supposed that open type of their structure is asso- ciated with withdrawal of large oocytes and redundant fluid from organism. This fluid comes into it dur- ing the freshwater period of spawning migration. The ovary structure and other biological characteris- tics of salmons are changed appropriately both in seguence of cherry salmon-chinook salmon-chum salmon and in seguence of cherry salmon-coho salmon-sockeye salmon-pink salmon during the devel- opment of new spawning grounds in the high latitudes. There is reason to suggest that. Far East anadro- mous salmons were originated from anadromous eperlans Osmeroidei as initial form of freshwater Salmonidae species. 1 tabl., 8 ill., 36 bibliog.