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by Bojan Dolenc » Wed Dec 09, 2009 1:03 pm
Dr. Jörg Vierke, Fischverhalten beobachten und verstehen, Kosmos Verlag 2001.
http://www.fischverhalten.de/index.html

Change in habit, producing change of function, is the main cause of the production of change in living structure. F. Wood Jones (1953) Trends of life