There are three methods of seed production and release. The economic advantages and disadvantages with regard to each method are analyzed and discussed.
Costs are higher for propagation of masu salmon than for chum and pink salmon.
An important comparison is the combined production and release costs in relation to the smoltification ratio that is strongly influenced by the character of seed. It should be mentioned, however, that production and release costs are only one part of the overall economic aspect of propagation of masu salmon. Recapture ratios and market prices also play vital roles. Moreover, natural conditions such as fresh water, climate, and water temperature are also important factors. Methods of seed production and release should reflect whatever natural conditions prevail at the propagation and release sites.