I'm glad this is useful information!
I have been reading about what people are wishing was different about the game, one thing I think would be cool is if you could right-click on each fish and get the details...name, cost, etc. AND a simple way to get ONE fish separate from its others if you don't want them all to sell, would be if you could NAME an individual fish, and still keep its other information intact while allowing it to be handled/priced differently. For example, in a tank full of Green Spotanus, you could name one "GS" or Spot or Gigi or something and price it way up so it won't sell...even as you sell off the rest at another price.