南米チチカカ湖のニジマスについて
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概要
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Lake Titicaca is a freshwater lake situated in Peru and Bolivia, it extents between 15°20 and 16°35 latitude south and between 69° and 70° longitude west and is 222kilometers long and 113kilometers across at its widest. Its total area including its 36 islands, has been calculated at about 9065 square kilometers. It is the highest navigated lake in the world, the surface of its water is 3812 meters above sea level, and fed by 25 rivers and streams which draw their waters from the snow of the mountains that fringe it. Its only outlet is the one river of Desaguadero in the south, and maximum depth is 370 meters. In my observation the surface water temperature was 14° ?? 16°C in April, 1961. During the year of 1939, Salmo trutta fario, Salmo gairdnerii irideus, Salvelinus fontinalis fontinalis and Salvelinus namaycush have been transplanted from the United States of America and Chile. They have achieved phenomenal size, especially Salmo gairdnerii irideus (rainbow trout-trucha arco iris) has grown very well and the largest one recorded is 1.22 meters in body length and 22.7 kilograms in weight. This fact is a very interesting phenomenon on freshwater pisciculture and I affirm that Salmo gairdnerii irideus may be the landlocked form of Salmo gairdnerii gairdnerii Richardson 1836.
- 公益社団法人 日本水産学会の論文