>I think I read somewhere a while back that cats fed exclusively on canned
>tuna get a taurine deficiency. Does anyone have any info on this?

I know this isn't the Paleocat list, but...in the interest of having
healthy pets:

Not sure about the taurine.  But, tuna can be dangerous for cats (as well
as humans) due to potentially high levels of mercury from polluted waters.
Deep-water fish are safer.