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The economics of fisheries. Proceedings of a round table organized by the International Economic Association, sponsored by FAO - Rome, Sep. 1956







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    The economics of ocean ranching: experiences, outlook and theory 2001
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    The document relates the experiences of ocean ranching in Japan, the USA and Iceland for the period ending in the mid-1990s. It then describes the fundamental externality of ocean ranching and finally discusses methodologies for assessing the costs and benefits of ocean ranching. The author concludes that private stock enhancement ocean ranching for river fishing is likely to continue in Iceland, while stock enhancement is also likely to continue in Japan and the USA as long as the respective g overnments are willing to fund the activity.
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    Consequences of biomanipulation for fish and fisheries 2001
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    The main goal of biomanipulation by fish reduction is not a change in the fish community but a change in the aquatic ecosystem. Fish reduction is a method to push the system in another state, usually a shift from algae domination to macrophyte domination. Intensive fish removal is done by one of the following methods: seining (the Netherlands, Germany, UK), trawling (Sweden, Finland), use of rotenone (Norway, USA, Poland) and stocking of piscivorous fish (USA, Germany). If circumstances allow it (reservoir, ponds) draining is combined with seining (the Netherlands, UK, Poland). The intensity and duration of fishing differs per case, but is quite important for the way the system changes. Fishing may be combined with stocking of predatory fish, mainly pike and pikeperch (or walleye)......
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