Two researchers carried out an investigation into the noise exposure of one of the aquariums due to the visitors in the Schönbrunn Zoo in Vienna, and found some surprising results. They hid an underwater microphone in a one cubic metre aquarium to register the effects of visitors tapping on the glass. Helmut Kractochvil and Harald Schwammer investigated this activity for four weeks, counting the taps per 100 visitors between midday on Monday to midday on Friday, and then from midday to Friday to midday on Monday. They then introduced three different signs with the inscriptions: “Tapping on the glass kills the fish”, “Only idiots tap the glass”, and “Please do not tap the glass”.
Anyone who has fulfilled the lifelong dream of buying an aquarium will be eager to populate it as quickly as possible! It is important to select the appropriate number of fish for the space you have available, and you will need to ensure you have matched these fish according to their respective needs, such as water type. To do this you should consult a marine expert or other trusted form of guidance. To give you an idea of the fish you could soon be welcoming into your aquarium, here is an overview of the best-known fish families and an example member of each group: