By 



Wilhelm Schaeperclaus, Ph. D. 



CHAPTER I 

 THE BIOLOGICAL PRIIICIPLES OF POi>D CULTURE 



A. Introduction 



The teachings of commercial pond-culture deal v.lth the problems of feeding and 

 existence and the biological factors of production of the pond itself. 



Together vrith Thienemann (1931), I understand production — in a general sense — to 

 mean total quantity of all organisms and their excretions ■ivithin a certain space of time. 



These fmidamental principles v.lll have to be considered in all questions, concerning 

 fish breeding in general, feeding, an:', rationalization of pond culture. 



B. liletabolism of Pond tish 

 The metabolic functions of fish can be divided into the two categories of: 



(1). Basal metabolism, (catabolism) 



(2 ) . Anabolisra 

 According to Schaeperclaus (1928, the latter may be subdivided again into: 



(1). Supplementary anabolism 



(2). Reproductive anabolism 



(3). Sedir.ientary anabolism 



