We have kept goldfish in our garden pond since 2006. I remember digging a hole for the pond during a rather fraught England game during the World Cup 2006. I must say because of that game we were able to build a pond in just a few hours. 🙂
It was so exciting filling up the pond, watching the flow of water into a thick black plastic liner. We were novice about keeping a pond so without much thought, we released a lone red goldfish my son had in an aquarium.
My son then said ‘you might just had killed that goldfish. You are to wait at least three days for the water to settle and then introduce the fish slowly to acclimatise to the temperature.”
Thank goodness, the fish survived. He is resilient!
Goldfish is a freshwater fish, they are easy to keep, as we have discovered, therefore, the most popular fish for ponds and aquariums.
There is a myth that goldfish has only a 3-second memory but this is not true. Our goldfish in our pond know about feeding time. They have also been a victim of a starving heron, which ate more than half of their numbers. This so traumatised those who were left behind (including us) that they would not willingly come up the water surface anymore. We had to put netting near the surface of the pond and this seemed to have reassured the remaining goldfish.
Apparently a study was done by the School of Psychology in the University of Plymouth. It was found that goldfish have at least 3 months worth of memory. They can recognise sound, colours and shapes.