More Goldfish Facts
Facts about Goldfish
Q: How much can a goldfish weigh?
A: Fully grown goldfish can weigh up 10lbs (4.5kg) but that is rare. However, it’s not unrealistic for a goldfish to be 5lbs (2.25kg).
Q: Do goldfish have ears?
A: Goldfish do have ears but not like you and I. They have internal ear bones called an otolith that can feel vibrations. Avoid tapping on the glass since it will stress or even kill them.
Q: Do goldfish have lungs?
A: Goldfish do not have lungs. Goldfish breathe by drawing in oxygenated water through its mouth. It then closes its throat and forces the water through gill openings where the oxygen in the water is absorbed (inhales) into the fish. The water is pushed out through the gill openings, taking with it the (exhaled) carbon dioxide and ammonia. The gills in fish are the equivalent of lungs in humans. Oxygen gets inhaled through tiny membranes in the lungs or gills and CO2 (and ammonia in fish) is exhaled.
Q: What is the coldest water temperature a goldfish can survive in?
A: The common goldfish can survive in an outdoor pond where water temperatures dip down bellow 40*F (5*C). They will go into a semi-hibernation by sitting, not really moving much and not eating down at the bottom where the water is warmest. Some pond might even freeze over during the winter and the goldfish still survive through to the spring.
Q: Can you water your plants with dirty aquarium water?
A: You can water your house plants or garden plants with your dirty tank water. The nitrates and fish waste in the water are a great fertilizer for your plants.
Usually the goldfish will become more round in shape since it’s full of eggs. sometimes it’s hard to tell with the fancy breeds that are already rounded. Take a look at the Breeding Goldfish pages for additional information.
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