[Return to Article]

Fig. 27. Diagrammatic representations of (a) life histories of anadromous, amphidromous, and catadromous fish (modified from Gross 1987) and (b) differences in lifecycle of masu salmon (Oncorhynchus masou) among different regions. In (a) (e.g., northern hemisphere), anadromy and catadromy exceed in northern temperate and southern tropic areas, respectively, while amphidromy are frequent between these areas. In (b), proportion of non-migratory and migratory (e.g., smolts) forms increased in southern (e.g., Kyushu) and northern (e.g., Hokkaido) Japanese streams, respectively, maybe by the differences in productivity among different areas. Also, spawning and downstream migratory period in masu salmon become later in southern and northern Japan, respectively (Machidori and Kato 1984).

[Return to Article]

Copyright © TERRAPUB