Ammonia levels in the water increased with time, as expected. The
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6 JOURNAL OF APPLIED AQUACULTURE
FIGURE 3. Body levels of Na+ (A) and K+ (B) of silver catfish fingerlings
exposed to various salt concentrations. Different letters at the same time point
indicate significant differences between treatments (P < 0.05). At some points,
standard error of mean bars are not shown because they are inside the marker.