Prey Model

 I would definitely encourage you to get the book.  And the other one too, which I'm waiting on - both have nutritional analyses of common raw meaty bones.  There's another source for that too, with more selection, which I'm trying to track down - maybe someone can job my memory.

Because, and I will have to check, I don't think fish has a lot of taurine in it. 

Actually fish is not a natural, nor a preferable, diet for cats.  Probably for this reason, among others.  There's actually not many land predators that are adapted to make fish a large part of their diet, interestingly enough.  You'll note that study I cited did not include fish. 

Taurine is most concentrated in heart meat.  The average cat has to consume around half an ounce of heart to meet this requirement, depending on what kind of heart it is (beef is highest, though obviously a hunting cat won't be eating beef).  That's a couple mice, or a rat, if once includes the taurine included in the rest of the carcass.  A hunting small cat, not one hunting for fun, will sit down and eat what it kills immediately, unlike a large predator which may eat part, then rest for a day, then eat some more.  This is what makes feeding a cat home prepared food more difficult - a small cat is adapted in a way that requires is to intake a complete nutritional profile in a very short amount of time.  That's why the taurine thing was such a disaster for cat owners.

I had a barn cat that just passed away two years ago in August.  He was twenty-three - and he died from wounds sustained with in a fight with a marauding animal of some kind, not old age.  He was still hunting, hale and hearty and with muscle tight as a drum, all organs checking out, up to his last checkup.  Sure, we set out food to make sure there was something for him at all times just in case, but more often than not, we tossed it.  He hated kibble.  The last couple of years I started feeding him a home prepared raw using a premix to ensure proper nutrition and he ate that up, and was the sleekest old cat you've ever seen.  Nobody who saw him could believe how old he was.