[GSAS-Member] Fish & temperature?

[DELPHILABS@aol.com]

When I am scuba diving with fish, I am always shocked at temperature and  
salinity changes as I am swimming around.  In some places the water  shimmers 
like oily water because fresh water is mixing with salt.  In some  places I 
enter 
very cold thermoclines and in others the water feels like  bathwater.  The 
fish are swimming right alongside me.
 
How is it that we are so cautious about temperature changes in the aquarium  
when they are the norm in nature?  I can see the concern over long term  
temperature levels, but during water changes etc, I wonder if it really much of 
 an 
issue.  
 
I'd appreciate the list's thoughts.
Thanks!
Keith
 
PS: recently back from diving in Belize.
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