Been checking through my notes for more.
A couple of throwaway lines. Idris asks "Do fish have fingers ?" and in Night Terrors the Doc, "How do you feel about kippers ?"
In TGWW an Aquarium is mentioned as being behind one of the eight time-stream doors in the lobby : - "...Cinema, Aquarium, Garden ", by what Amy called 'the voice of God'.
TWORS In the flash of Amy's kitchen there is a goldfish bowl next to a tall plant in the background.
In the recent SJA 'The Curse of Clyde Langer', the storm rained trout. As legend has it, that also happened when the totem pole containing an ancient god was moved from a cave. The fish were later implied by a fortune-teller as a sign "Something bads coming."