Change in Fish Species and its Artificial Impact on Lake Kawaguchi.
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概要
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This lake was mainly stocked with Carassius cuvieri and Hypomesus by the Kawaguchiko Fishermen's Association until the 1980s. However, since Micropterus salmoides salmoides were confirmed to exist in the lake in 1973, by early 1985 Hypomesus were no longer caught. This condition continued for a short period ; then, in the 1990s, the fish species composition showed a great change in the lake. Micropterus salmoides salmoides and Salmo (Oncorhynchus) mykiss became the main catch. As a result, 370, 000 anglers visited Lake Kawaguchi in 1996, against 35, 000 in 1978. The total number of anglers who visit the lake is increasing rapidly. At present, Lake Kawaguchi has become the most famous lake for fly fishing in Japan. In order to respond to the demand of so many anglers, the Kawaguchiko Fishermen's Association stocks the lake with many species of carnivorous fish. Moreover, they annually stock an abundance of small plankton-feeding fish which in turn become the food of carnivorous fish. Owing to the above circumstances, Lake Kawaguchi has become like an artificial fishing pond, with disturbing effects on the lake ecosystem. The ecological impact on other aquatic organisms has become a cause for concern.
- 日本陸水学会の論文
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