Why are plants and goldfish grown together in a fish pond?

Answer 1

It is unlikely plants and goldfish will be successfully growing in a 'fishbowl'. The reason for this is that a fishbowl is not large enough to even house a goldfish properly. (or any other living thing IMO). However, in an 'Aquarium' of sufficient size, it is possible to have both fish and plants growing successfully. In this case the plants do in the aquarium what plants/trees do in our air. The plants clean the water by removing impurities like the carbon dioxide and nitrates that are produced by the fish. Plants also produce and release Oxygen during the process of photosynthesis as they grow and breathe. So the plants are nourished by the fish and the fish get better water conditions provided by the plants. Good result all round. When this is achieved successfully in an aquarium it is called a 'balanced aquarium'

Answer 2

Plants in a pond do the same cleaning job as trees do in the atmosphere. Goldfish produce by products some of which are poisonous. The plants use and convert those by products rendering them harmless they also add Oxygen and use up carbon dioxide. Without plant life, life as we know it would come to a stop.