Rendering a model inside a GUI rect

When I click on a fish model in my scene I want a GUI box to render with the 3D model of the fish and some info about the fish inside of it. I have the GUI box and information set up correctly but I cannot figure out a way to render a fish model in the GUI.

Code to select which fish has been selected and apply the relevant information:

   case "Fish Salmon - Avoidance":
                         //salmon interaction
                         Info = "Salmon";
                         PopUp = true;
                         print("Salmon");
                         break;

Code to render the GUI:

  void DrawInfo()
     {
         Rect rect = new Rect(350, 20, 300, 200);
         Rect close = new Rect(629, 21, 20, 20);
         if(PopUp)
         {
             GUI.Box(rect, Info);
             if (GUI.Button(close, "X"))
             {
                 PopUp = false;
             }
         }
     }