2013 Volume 53 Issue 1-2 Pages 33-51
The present situation and the problems on the extermination of introduced non-native fish by fishermen in the Lake Biwa are examined through the documentary materials and interviews with the Fisheries Department of Shiga prefecture, the Shiga Prefecture Federation of Fishermen’s Co-operative Association, the Moriyama Fisheries Cooperative, and the Okishima Fisheries Cooperative. It is shown that fishermen exterminate introduced non-native fishes efficiently through the comparison among extermination projects of introduced non-native fishes and the analysis of the seasonal variation of the extermination catch by fishermen. Fishermen feel indebted to work with governmental subsidies, have pride to conduct their native fisheries, and feel uneasy for fishery management due to the decrease of native fishery production. Several fishermen in the Moriyama Fisheries Cooperative and the Okishima Fisheries Cooperative derive more than half of the fishery income from introduced non-native fishing, and they have to depend on introduced non-native fishing because of their decreased strength. Although having negative thought against the extermination of introduced non-native fish leads a secondary influence, it can be one of the factors to inhibit aggressive participation in increasing effort of introduced non-native fishing. It is necessary to develop a system for the extermination in consideration of the fishermen’s consciousness.
