COMPARATIVE POPULATION STUDIES IN FISHERY BIOLOGY 71 



E. B. WoRTHiNGTON : Clearly also this approach should allow informa- 

 tion about the species to be deduced from the habitat data. Growth rates 

 and breeding size vary very widely: thus in Tilapia there is great variation 

 with habitat, and extrapolation from one habitat to another without adequate 

 data can give misleading results. 



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