Abstract
Outline of geography, environment, biological production and fisheries in Lake Hamana is reported and the relations among these characters are discussed. Geographic characters cause anoxic water in the lake basin during summer season. The circulation of inorganic and organic nutrients are highly influenced by the existence of the anoxic water. Biological production and fisheries in the lake are directly and/or indirectly affected by the distribution of these materials. In conclusion, the relations between the changes in geographic characters and development of the fisheries industry are clearly observed in the history of Lake Hamana after 1951.
