definitely not all collectibles in bb.showhiddenobjects. just fish.
Also, it seems like some fish from build/buy mode cannot be placed in fish bowls, aquariums or ponds, either.
Yeah, fish have always been difficult to acquire. Since the bb fish are apparently for looks only and if you don't really have a lot of time to go fishing, I suggest you remember the Gallery is your friend, if your sim can (ouch!) spare the money.
How can you look for collectibles in the gallery? I thought all it provided was households, lots, and rooms.
