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Abstract:
This paper covers the ecological development of the major ornamental fish Paracheirodon axelrodi
found in rain forest streams (almost "clear-water") in the region of the middle and upper Rio Negro.
Limnochemical conditions in these extremely nutrient-poor waters during both the low and high water
seasons over the spawning period, as well as breeding conditions in captivity, are described.
A comparison is made between the very slow rate of growth and limited age reached as a result of
a food deficiency in its natural habitat, and the potential growth if bred under optimum feeding conditions.
