I found this site through a search...
http://www.cleverarts.com/fishtycoon/default.asp
(sorry if links aren't allowed) Anyways, it's incomplete in at least 1 combination.. if you put greenfin and silky it'll say the answer isn't available, but the answer is orange.. I've been working on a graph myself, long hard work, but gives me something to keep me busy.
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As much as I loved the ><}}}> Now I love the villagers soooo much more!