Comparisons of XXXX regulation in fish larvae.

@entity15249 @entity460 @entity141 @entity3392 @entity2083
The purpose of the present study was to compare the ability of larvae of different species, @entity2083 ( @entity2083 ), @entity3392 ( @entity3392 ), and @entity15249 ( @entity15249 ), to regulate their @entity460 balance. Whole-body @entity141 content and @entity141 influx in the larvae of the three species, which were incubated in low- (0.02 mM), mid- (0.2 mM), and high- (2.0 mM) @entity141 artificial fresh water from embryonic stages, were compared. The @entity141 uptake kinetics were determined in @entity3392 and @entity2083 incubated in high- or low- @entity141 artificial fresh water. @entity141 content of both @entity3392 and @entity15249 acclimated to low- @entity141 media were significantly lower than those acclimated to mid- or high- @entity141 media. However, @entity141 contents of @entity2083 in low-, mid-, and high- @entity141 groups showed no significant differences. In @entity2083 , @entity141 influx in the low- @entity141 group was significantly higher than those of the mid- and high- @entity141 groups. In contrast, the @entity141 influx rate in the low- @entity141 group was significantly lower than those in the mid- and high- @entity141 groups in @entity3392 and @entity15249 . Compared to the high- @entity141 group, the low- @entity141 group of @entity2083 showed a 13% increase in the maximal velocity (J(max)) and an 84% decrease in the Michaelis constant (K(m)) for @entity141 influx. Smaller changes, i.e., an 8% increase in J(max) and a 67% decrease in K(m), were found in @entity3392 larvae. @entity2083 possess a more effective @entity141 regulatory capacity than do @entity3392 and @entity15249 . Differences in the strategies for @entity141 balance may be associated with different development patterns and environments in which these fish naturally occur.
