The trail is thick and food coloured. Im in SouthEast England. I have been feeding wheatgerm occasionally (every 2 weeks)otherwise they feed off the pond. All the fish are as active as each other and the way they always have been.
I have a pond with 8 or so large gold fish. One of then is very bloated and now has a trail about 6 inches hanging out of its rear. It behaves normal, no scale problems, swims well and stays straight. Is it ill or carrying eggs? I will try and get a picture but it isnt that easy to do.