The study on the real conditions and problems of inland water fisheries: As a special example of the lake Koyama fisheries [Japan]

We aim to make clear its real conditions and problems of inland water fisheries through an analysis of the Lake Koyama fisheries. The results of this analysis were following: in the Lake Koyama fisheries,the number of fisheries establishment and fishery workers decreased, and the pollution of water quality of Lake Koyama caused the falling down of production, so that the catch quantity of fisheries and its sales values also decreased. As that results of these factors, inland water fisheries became to a badly-depressed condition, but these fisheries have so various kinds of functions such as subsistence of fisheries households, establishment of side-business of small-scaled farms, and the supply of irrigation water to sand-soils districts and places for recreation to citizens and so on. Accordingly, to develop inland water fisheries with the above mentioned important functions, the way of making a high profit by increasing fish species based upon enforcement of released seedlings projects and by improving their marketing efforts (including processing) of productions should be searched out