Original scientific paper
THE INFLUENCE OF NONIONIZED AMMONIA CONCENTRATION ON RAINBOW TROUT FINGERLINGS KNIN FISH FARM
Božidar Kulišić
; PZ "Orlić Markovac" Pastrvsko ribogojilište Knin
Abstract
The method of laboratory testings of total ammonia has been shown in this paper so that nonionized ammonia which is toxic to the fish, can be determined. The concentration of only 0,003 mg/l of nonionized ammonia in this water slowed the growth, while the concentration of 0,004 mg/l resulted in central nervous system disorders. The concentrations are well bellow the limit of USA Environment Protection Agency for sal-monids. The excretion of ammonia mainly depends on the quantity of consumed food but it is subject to large oscillations in the course of the day and hour and it also dependse on concentration of oxygen.
Keywords
ammonia; trout fingerlings; Knin fish farm
Hrčak ID:
77176
URI
Publication date:
20.9.1989.
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